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Tire Repairs, Pressures, Studding, Vibration/Thrumming, ETC!!
Copyright, 2013, R. Fleischer

Article # 54....section12
TireRepair.htm

The items shown in this article are things that some folks carry along with them on their rides; or, use at home.  NOT shown are items specifically for tubeless tire repairs (I DO discuss tubeless repairs), nor many of the other available types of tire tools and accessories.  This article is to give you ideas, and to make you think.

I will provide hints throughout this article, and MORE hints near the end of this article... to make tire changes or flat repairs easier for you.


How MOST tire punctures/flats occur (maybe!!):

I am not sure of the commonly held belief that the front tire "sets up" road debris for rear tire punctures.  I think it is quite possible, and one of several ways the rear tire always gets more punctures than the front.  I have seen arguments that the use of a mudflap on the front will reduce punctures.  A few think that a mudflap on the FRONT OF THE REAR FENDER also helps, if it sticks down very close to the road.  I think both flaps MAY WELL HELP.   I have found nothing but anecdotes; no definitive testing on how/why/details, punctures occur. If there is such testing, I'd be interested in looking at it. I suspect that more than one tire company has done testing in this area; but have not looked in some years for it. I once tried to find out, from two tire manufacturer's, and did not get much really useable information back from them.

It may be a combination of things, and that is what I believe.  Various discussions and various arguments put forth (some by me!) have included weight; the high pressure-point contact of the rear tire when the motorcycle is accelerating; the fact that the rear tire slips a lot, even in cruise, even when not accelerating; etc.  My own belief is it is a combination of the front tire sometimes 'picking up' debris, but probably the phenomena is PRIMARILY the driving and also when accelerating forces at the point barely ahead of the major contact area, that is responsible for flat tires.   As you ride, power on just to maintain speed, and worse when accelerating, causes the rear tire tread to deform, and these help to strongly pick up the debris and force it into the tire. A factor with that particular idea is that low tire pressures probbly increase the likelihood of flats, and many do not check tire pressures regularly.   Perhaps secondary reasons are the rear tire slippage; with any other factors much less.

Until I get some sort of definitive answers/replies from motorcycle tire manufacturer's, the above will have to do.   Meanwhile, don't ride in the middle of the lane, don't ride on shoulders of the lane, and keep your tires inflated...and INSPECT THEM regularly.  A fair amount of flats occur from nails, etc., that have been in the tire for some time.  Install mud flaps.


Tire Tools, etc.:

Many BMW airhead motorcycle riders have never repaired a flat tire, nor have they ever changed a tire.  Many have never seriously considered the consequences of having a flat while on the road; especially if out of cell-phone coverage.   

However...many do their own tire repairs, changes, balancing, and wheel bearing service.  A LOT of $$ can be saved by doing your own servicing.   Knowing it was done correctly is a big added plus.

In the middle area of the photo below is my own modified C-clamp tire bead-breaker, note the welded-on shaped plates on the jaws/anvils.   The welded-on plates are shaped on one edge of each to match the circular portion of the wheel rim, so as to have good wide contact with the tire bead at the rim area.  This particular C-clamp has been lightened a bit by drilling holes in it.   This type of modified C-clamp could be taken along with you on your rides. 

Those with TUBELESS tires NOT containing tubes normally do NOT take any type of bead-breaker on rides....but you may want to take along some sort of strap or rope that fits around the circumference of the tire, in case of bead seating problems during trying to re-inflate, if the bead became unseated.

The lower right area has a weighty and heavy duty tire bead breaker, a bead breaker of some method is needed to do a proper repair on a tube-containing tire. You'd likely NOT take this one on the bike due to its weight, which is MUCH higher than it looks... but it is OK for the home shop.  Just in front of it is a modified wrench to operate the nut of this bead-breaker, although any common open-end wrench would do.   There are many versions of bead-breakers for motorcyclists; the one shown here is very heavy.   There are some plastic types that are much lighter, and rather clever.   

NOTE that some folks use one side of the center-stand to break the bead area, but I have never liked that method.  If it works for YOU, then you need NO tire bead breaker.  Please keep in mind that putting pressure on a brake disc and disc carrier is a VERY BAD thing to do, you could, and are LIKELY, to warp the disc carrier permanently.   If you plan to use the centerstand, keep that in mind, and perhaps carry a piece of wood to keep the disc off the ground.

Fix-A-Flat (or similar brand of goo) is NOT overly practical, and perhaps should NOT NORMALLY be used.  These SELDOM work on tube tires, but may work on tubeLESS tires.    Fix-A-Flat and similar stuff makes a mess inside the tube/tire/wheel, OFTEN does NOT work (particularly tubed tires), often prevents a patch from sticking if you are forced to try that later.....and if the stuff does work, it often fails shortly thereafter.   One should NEVER let a dealership repair your tire later on without first telling them that you installed that stuff. You will NOT like using solvents and rags to clean out your wheel.  Most dealerships will NOT be happy finding out that your tire/tube/wheel has that messy stuff in it. Cleaning it out takes time. Time is money...out of YOUR pocket.    SOME do carry these cans of pressurized goo and have had decent results.  It DOES give added protection if you are doing a tubeless repair.   There is also a product called SLIME, with some other brands in use too, it is installed often in bicycle tubes, as protection against flats.  It does work, perhaps not so well with motorcycles.

At the lower front is a common patch kit for a TUBE-type tire.  The patch kit contains patches AND A SMALL TUBE OF GLUE.  BE SURE you check your glue tube now and then....even if has never been punctured for use, they have been known to dry out.  Some folks replace those tubes yearly.  Others, LIKE ME, purchase a larger container, usually a small metal can with a brush inside the screw top, and check it every year. 

I have not shown a kit for tube-LESS tires....see information later in this article.   

At the top middle area is a package containing a new spare inner-tube.  For most bikes with not hugely different front-rear sized tires you can use a front or rear tube at front or rear in an emergency.   It is usually OK to carry just a spare rear tube, rather than a front tube or both.   Also in this photo is an old pill bottle that contains real tire talc (REAL tire talc contains no oils that rot tubes); needed for tube type repairs.  To its right is a plastic squeeze bottle with flip lid; one can use any sort of these flip lid plastic bottles, such as from hair styling products, and this particular bottle is partially filled with REAL tire lubricant liquid, made from properly water-thinned concentrate. Some use thinned soap, I vastly prefer REAL tire lubricant, which actually is 'flaxsoap', which is not a soap as you would normally think of soap.    Autoparts stores carry real tire lubricant in tubs (thin per the tub-printed information) ...one tub will last several lifetimes for you and several friends; so share your 5 pound tub with your buddies.   

Note the electric air pump with hose and electrical cord (I removed and tossed the original large plastic case before taking this photo).  These are available very cheaply, often much less than $20, from such as Wal-Mart, etc.  The large outer plastic case is removed, and the small fan removed by cutting the shaft with a Dremel or similar tool, and either alligator clips as shown or perhaps a BMW accessory plug attached at the other end.  The current drain from the battery is fairly low for this item.  Some of these pumps have air pressure gauges which can be utilized, or not.    These electric pumps are now available in a SMALL package; previously they were not....so see further down this article. 

The engine-driven type of pump is at the lower left in the above photo;...these come in kits with various sizes of spark plug hole adapters.  Only the 14 mm spark plug adapter is shown in the photo.  NOTICE above it are two coiled-up Sash Rod springs, available from any hardware store.  Those two springs, when you need to use them, are wrapped around the engine cylinder and spark plug metal body, so that the removed spark plug, with its electrical cap attached! can be held to the cylinder fins, to avoid injuring the ignition system during the one-cylinder operation of the Airhead engine.  If the spark plug was just laid on the engine, it could fall off, and produce an open circuit, causing a lot of $ damage to the coil(s), that might not show-up immediately.  On the 1981+ models you can additionally damage the Hall device in the ignition canister, and even the ignition module under the fuel tank.  Damage may not show up right away!

This next photo is another type of bead-breaker....very practical for the home user, and can easily be modified to work well with motorcycle-size wheels by removing the small vertical tab; and, perhaps extending its tail a bit, and using it with two pieces of 2 x 4 allows it to be used with single or dual disc brake wheels, without putting pressure onto the discs.   This type of bead-breaker....shown here in its automobile usage style, UNmodified;....is very practical for home use, and not very expensive, and often available from such as JC Whitney; or other stores.  There are motorcycle specific versions of these type of tools.

 

***There is a bead-breaker combined with tire irons, a clever, if complicated looking unit, that is called the TireIron BeadBrakR, sold by  www.bestrestproducts.com
I have not tried this unit myself, but have heard favorable reports from those that have purchased and used this item.  It completely folds-up and is a small package, totally carry-able on your bike.

 

A small compressor, basically a small plastic cased version of the one in the first photo at the top of this page.  This one, in its blue package (the carton it came in is in the photo), comes with a standard American cigarette lighter plug, which I changed to alligator clips.  It was $9.99 at Wal-Mart.  It is a terrific bargain.  Those willing to have an electric compressor 'package' slightly larger than the stripped one in the first photo on this page, may well want to consider this one.  I carry the stripped-down one at the top of this page as it is smaller.

 

 

 

 

 

 

 

I do NOT recommend CO2 cartridges for repairs.  Best is a cylinder pump or an electric pump as shown above. It can take way too many of the small CO2 cartridges to fill a tire adequately, typically even a handful will only fill the tire partially. Even the larger CO2 cartridges are not adequate many times. Also, if you have to refill the tire if the repair worked only partially, you'll likely have no more cartridges.  More on cartridges a few paragraphs below!

 For TUBELESS TIRES (no tubes inside) repairs when on the road, you should carry on the bike some sort of tire plugging devices and tools for them.  One common brand is Stop&Go, either the standard model 1075 gun type, or the compact hand unit model 1000.    NOTE that the Stop & Go tire plugs are also useable for steel belted tires, but with steel belted tires the injury hole MUST be reamed really well, with the tool included, before installing the plug.  Failure to do that will likely result in the plug being sheared and permitting a leak very soon.   In general, I recommend the StopnGo smaller plugger kit, and ALSO recommend you carry BOTH sticky-strings and cement.  Even in quite egregious instances, having a plugger kit, sticky strings, and extra cement, can be very worthwhile. I personally have had a VERY bad and large tire puncture, not a round hole either, and had to use BOTH sticky strings AND mushroom plugs.

NOTE that plugs, installed from the outside, are a temporary repair for tubeless tires.  You are not supposed to travel far and fast using an externally plugged tubeless tire.  Many have done it, but I do not think it advisable and I DO NOT recommend it.  Many who have bikes with tubeless tires will carry a tube, for emergency repairs, not trusting external plugs.   Many have temporarily repaired tubeless tires with a 'string' or other type of external plug.  Many have gotten away with this for the life of the tire.  My suggestion is that you do NOT do this, but have your road-side temporary plug repair properly fixed at the next available dealership.....or, do it at home. So, what I am saying is that tubeless tires should eventually be properly repaired with an inside patch-plug....or replaced.    Please also keep in mind that if you install a tube in a tubeless tire, you should reduce the tire speed rating by one step, as the combination causes more heat to be developed.
 

WHY I do not recommend CO2 cartridges; & some hints when NOT using cartridges:

I do not use CO2 cartridges.  Besides their cost, and bulk, they will not really do the job much of the time.  I prefer the tiny electric compressors shown above, even though they have lower instantaneous air available.  CO2 cartridges ARE  "somewhat" adequate to inflate a TUBED tire after a flat repair or a new tube is installed on the road someplace.  It takes WAY too many of of them to actually inflate to the proper pressure....a nasty little drawback, hardly ever mentioned.  They are adequate for tubeless tires, BUT ONLY IF THE TUBELESS TIRE IS INTACT AND SEALED TO THE RIM, ALL AROUND, OR CAN BE MADE TO BE SO.  They STILL will NOT inflate the tire more than enough to travel at low speeds to a place you can do a proper inflation.   If the tire is not properly inflated, it WILL get hot, perhaps TOO HOT.   Steel-belted tires with have more flexure at the plug repair, possibly shearing it off.
 
It is NOT unusual for a tire to move to inside the rim when it goes flat.    When that happens to a tubeless tire, not containing a tube, you MUST find a way to bring the tire sidewall fully in contact with the inside of the rim, in order to inflate the tire.  One has a lot of leeway on this in a SHOP situation, because in a shop you have the ability to remove the valve CORE, and use a tire chuck, or modified tire chuck, on your compressor with the tire chuck center removed, and you have strap tools.    That type of modified tire chuck, and a tank of high pressure air driving it, gives a LARGE flow of air, just what is needed in marginal situations for trying to seat the tire sidewall to the rim.   That is NOT available in the field. CO2 cartridges do NOT have proper inrush.  

 BTW...that 'fast inrush' is one of the BIG SECRETS to getting ANY (tube or tubeless) tire to fully seal around the rim....when a tire, even properly lubed, is 'being difficult'.  I will have lots more to say about this, later in this article.
 
For some years now, various types of the Chinese-made small electric piston compressors that are shown in this article have been available, at less than $20 from many sources, such as Wal-Mart.  Some are in very small packages, some need to have all the plastic crap removed, and proper wires and clips or plug installed.  There is NO problem in running one of these compressors on a bike battery for several tire inflations to proper pressure....and still be able to start the bike.  These are MUCH better, in MY opinion, than CO2 cartridges.   Motorcycle batteries ARE capable of running these small electric compressors to fill quite a few tires....and still start the engine. These cheap little Chinese compressors also hold up better than you may think.  Some folks are packaging these tiny piston compressors in their own metal box, and selling the boxed compressor for $$$.
 
For those with tubeless tires, NOT running tubes, I recommend your favorite plugs, patches or string or whatever style of repair kit you wish to use (with reasonably fresh rubber cement!).   I DO recommend you carry BOTH sticky-strings and some sort of mushroom plugs, and have a piece of rope or long strap that goes around the outside circumference of the tire, which you can use with one of your tool-kit items, like a tourniquet, in case your tire no longer is sealed to the rim.  I also suggest tire lubricant (the REAL stuff).
 
Tire plugs of the Stop-'n''go type are useful, but if you have steel belted tires, be SURE to ream the tires quite well, and be prepared to re-inflate if the plug fails.


Hints, methods, advice, ideas to consider, ETC:


If your fuel tank is approximately half full (or more), I "suggest" you REMOVE the fuel tank before repairs.

One very popular method of repairing the rear tire on ALL twin-shock airheads (some do it for Mono and Paralever bikes too) is put the bike on the center-stand and then to SECURELY!!! tie the center stand to the front exhaust crossover pipe.   Remove the front wheel, tilt the bike forward onto the fork lowers, onto something like your gloves, etc., to protect the fork bottoms.  Be sure to bungee any disc brake calipers so their hoses DO NOT have sharp bends, especially at the fittings ends. NEVER hang disc brake calipers by the hoses!!!!
This crossover-pipe method is what I personally do.

Below is another method of strapping the center-stand ...here it is to the front forks.  Note that the owner is not using any strapping of the front exhaust crossover pipe to the center-stand. 
Photos courtesy of Dann Rudd (which I cropped).  You really want to be sure that the strapping can NOT come off suddenly. 

NOTE that if you modify your bike so there ISN'T any front crossover exhaust pipe, you will have to figure out a way to tilt the bike forward, somehow securing the center-stand, to remove the rear wheel.


      

 

What follows in this article is a lot of information on how to deal with a tube puncture, and how to patch that inner-tube; how to R/R tires and tubes, ETC.   If you do it my way, you will not likely have patch failures, and you will not likely have tire mounting problems.   There is a LOT of information here.  SOME will definitely apply to YOUR bike.

The best on-road fix is to discard the old tube and install a new one with tire talc put on by your hands.  It is also MUCH faster than removing, patching, and reinstalling the original tube. Purchase another brand-new tube for your on-bike repair kit items soon.  Don't forget to remove the offending nail, screw, etc., from the tire...many have forgotten to do so!!   Unless your front and rear tires are the same size, or close to the same size, it is really best to have both sizes of tubes. Many do not, and carry just a rear, which can be put into a front in many instances (such as 18 rear into 19 front, but not recommended for 18 rear, 21 front, obviously).

The next best choice is to repair the tube and continue on.

NOTE:  Some do not carry tire repair items, or have limited items, or install some sort of sealant product into their tires or tubes.  YOU have to decide what YOU are going to do.

NO TUBE that has extremely long splits, tears, etc., should be patched, and usually the patch is not successful if huge, on a motorcycle-sized (or bicycle-sized) tube. 

Butyl AND natural rubber tubes, with punctures or small tears/slits, etc., are certainly patchable, contrary to some beliefs.

Most people fail to first roughen the tube and clean it properly. Most also slather on WAY too much tube glue (DO check now and then that YOUR glue is in good condition!). They also fail to dry the applications of glue the correct amount of time. They additionally fail to allow a long-enough final cure.  All these things can lead to patching failures.
 


In April 2013, I changed this entire article extensively, so that it INCLUDES lots of additional hints, etc....on what you might do for removing and installing or just repairing a new tire (or tube) IN YOUR SHOP/GARAGE and when on-the-road.   Because of these changes, use what portions of what follows, for your specific situation.    Because of many variables, the rest of this article is not necessarily in any specific order of events.


When you start working with an existing tire on the wheel, deflate it by REMOVING the Schrader valve core.  "Break" the tire bead on BOTH SIDES of the wheel.  PUSH the valve stem (on tubes) to the inside.  REMOVE the tube.  Remove the tire.  When you replace a tire, inflate the tube a small amount, just to shape it a bit, and install into the tire.  Put the wheel rim on an angle, and insert the tube's valve into the rim hole. Feeding the tube stem into the rim hole can be fun.  Later in this article I will have some specific advice on that.   Once the stem is inserted through the rim, put on the nut a few threads. START spooning the tire at a point totally away from the valve...the opposite side of the rim.  Repeat on other side.
        
         Many install the tire on one side, then install the tube, then install the second bead.  Be very
         careful, no matter how you do yours, that you do NOT pinch the tube with your tools!!!  It is even
         possible to put a hole in the tube in the VALVE STEM area, if the tire bead is trapped and moved
         about at that point.   Take your time to watch what you are doing.


   
a.  Any puncture or tear needs to be cleaned up, sanded/abraded with a inner-tube
         metal abrader, and best to do it VERY thoroughly; don't use sandpaper, unless
         you have a way of solvent cleaning the area afterwards.    Next clean the area
         with alcohol or other solvent; gasoline is NOT good here, it MAY have
         ingredients that MIGHT prevent solid patch adhesion.  Gasoline is better than
         nothing.

    b. Using one of the repair kit patches, peel off the protective layer, KEEP FINGERS
        OFF THE ACTIVE STICKY SIDE,  & using a CLEANED fingertip, spread the
        smallest amount, thinnest layer, of the cement goo on the tube, and the patch's
        active adhesive side.  Yes, BOTH of them.   BE SURE the patch is covered to its
        own edge. BE SURE the tube is properly prepared and you kept your dirty
        fingers off of the repair area and patch active surface.

    c. Allow each application of the tube's goo, in tiny amounts remember!... to dry.
        How long depends on humidity and temperature.  I suggest several minutes.

    d. Repeat the fingertip application of glue THREE TIMES. Use the TINIEST amount
        of goo!!!  On the last application, before it is totally dry, press/clamp the tube
        and patch together, and leave clamped for a day or so if at home. If doing this on
        the road, try to clamp with some sort of flat wood or?, as flat as you can; and try
        to have the patch lay quite flat, particularly at its edges!  Allow as much time as
        your patience allows.

    e.  When installing the tube, use your hands with TIRE talc all over the tube, and
         inside the tire. I like to wait a bit after inflating, perhaps 15 minutes or more,
         before riding on a patch job.   My personal method of on-road repairs, AND in
         my garage, is to R/R tubes with one side of the tire still inside the rim.

    f.   If your tire is marked on either sidewall that it is to be installed in one direction, pay attention to that.
         On BMW twin-disc wheels, the carrier NUTS are normally on the LEFT; which, thusly, identifies the
         wheel direction of installation. Many wheels and some discs, are marked for direction.  Whatever
         your wheel is, keep it that way, or you will need to re-break-in your disc brake pads.  

    g.  Install one sidewall of the tire onto the WELL-CLEANED inside rim surface first, using tire spoons
         and REAL tire lubricant.  Cleaning the rim bead surface is important, do the best you can if on the
         road.  I've carried sandpaper for this purpose.  At the least, use gasoline and a rag (careful!
         flammable!). It makes for easier bead seating.

    h.  Note:  Sidecarists sometimes use rear tires at the front, and front tires at the rear.  Sidecarists may
         mount those tires with the arrows in opposite direction from the tire markings. Do NOT generally do
         this on a 2-wheel bike.  Sidecarists and some 2-wheel riders also do strange things, such as using
         rubber pieces under the rim where the valve stem sticks through, and rubber on the outside, then
         have the stem nut and cup washer against that.  The idea is that the tire, whether a tubeless type or
         not, will hold some air, for awhile at least, if the tire/tube is punctured.  Normally, the proper
         installation is no rubber things, and the nut that comes with tubes is threaded UP to the TOP of the
         valve stem, meeting the stem air cap.  The idea being that if a flat occurs, the tube (you DID install it
         with tire TALC all over it surface, and tire insides too?) can move a slight amount, with tire
         movement on the rim... avoiding having the tube stem rip out, making for a very sudden flat.  BMW
         even had a bulletin about that....more on this below.

   
i.   Use TIRE talc on your hands to get the tube surface & inside tire surface slippery, before installing
         a tube.  Install the nut onto the tube valve stem, a few turns.  If the tube came with TWO nuts,
         and/or any cup washer you can use the cup or not and can leave the inner nut, or not, depending on
         YOUR rim & tube.  If you discard one nut, keep any cup washer the tube came with, onto the tube,
         only IF appropriate to YOUR TUBE AND RIM.  Put it INSIDE the tire, if it fits the stem and rim
         properly.  YOU WILL want a nut for the outside, for the specific purpose of assisting you with
         keeping the valve into the rim hole. 

         HINTS:  Feeding the tube stem into the rim hole after the tube is otherwise fully inserted into the tire may be
         difficult; especially if the sidewall is quite stiff.  The sidewall may need considerable finger pressure,
         and some may use a small block of wood to keep the sidewall a bit more open.  If you go too far
         with that idea, the other side of the tire will move and block the valve access.  Some have used
         forceps gripped onto the stem threads to help guide the valve into the rim hole.  I recommend you
         do NOT using any tool that can injure the threads.
 

         There is a thin braided steel flex cable tool available, it is specifically for doing this job.  It screws
        
INTO the valve stem.   Tusk Valve Stem Puller  part number 1188500001.
         Get one of these; try your autoparts store, if necessary an internet search.
        

 

         Below is the type for tubeless rims for pulling the valve stem into place.  If you modify it, it will work
         on tube types.    The Knurled end of this tool as purchased will NOT fit through the smaller
         diameter TUBE-type rim holes....  it WILL, if you carefully thin the outside diameter, by grinding
         the knurled cap end a bit thinner.
  Grind the O.D. just enough so it EASILY goes through the
         rim hole, and NOT MORE, as the walls willl be too thin.  Haltec TL-645-24, or Grainger 33510,
         or similar on Ebay.   Get ONLY the flexible cable type as shown here.  One of the dual-barrel
         ends of this tool is to R/R the valve core, and the other is to depress the center pin of the valve
         core on an already inflated tire, and there is a small side hole; this allows the air to come out
         slowly, avoiding you unscrewing the valve core and have it flying into 'never-find-land'.  
        

         Once the tube valve stem is in the hole, using one of these two tools, then put the nut on the stem,
         only a few threads!

         You also want to line up the painted dot or other painted marking, if you have such on the tire, with
         the valve, when installing the tire onto the rim, before spooning the second sidewall onto the
         rim....this is a good time for more tire lube...note that tire lube is used on the bead seating area of
         rim/tire...and, on the EDGE of the tire bead area.

         Although this is best avoided; if you have to, move the OUTSIDE nut down fully to the rim, & move
         the tire slightly one way or the other (NEITHER bead has snapped to the rim yet, because you have
         NOT inflated the tube/tire) so the stem is centered and at 90, in the rim hole.  DO NOT spoon over
         the final bead NOR inflate until this is so.  It is best to
avoid doing tire movement on the rim.  Do
         try to avoid this....by lining up the tube stem and tire to the stem (if it has a paint mark), all at the
         same time, BEFORE spooning the final bead onto the rim; is that the ease.  You really do not want
         to have to try moving the tire in relationship to tube/wheel....as such movement depends on the
         inside surface of the tire, and if the tire talc you applied is going to ease the friction enough.  You
         also would need to have the outside nut hold the valve pretty tightly to the rim.   That's not the
         greatest idea either.  You don't want to put excessive force on the tube!

         Assuming you have the tire and rim and tube valve in proper alignment, have the nut upwards a
         number of turns.  It is best NOT to have the nut down to the rim and tightened just before inflation.
         The purpose of the outside nut is ONLY to keep the valve from going back inside the rim during your
         work.  This outside nut that is used as a tool can be tossed after installation, or, moved up to the
         stem cap. I recommend you move it up to the stem cap, as sometimes new tubes do not come with
         a nut and I like to have one, in case I do not have the fishing tool, and, it makes things easier even
         with the tool.
DO NOT leave this outer nut tightened to the rim! Even BMW had a bulletin on that!
         The stem should be free to move about in the rim hole, stick straight out at 90, and not on
         an angle, when you have the tire/tube/wheel properly assembled and inflated. 
You cannot!!
         determine if there is any side forces on the tube, unless you have the nut loose, during and
         after inflation.  When done, THEN you can put the nut against the cap. DO NOT fail to use
         a cap that SEALS well.

         Obviously if you have a tubeless tire, used as tubeless, you have NO inner-tube, and you
         have NO inner-tube type of valve stem to worry about.


    j.   On a rare occasion a tire will not balance properly without a large amount of tire weights added.  It
         is OK to have the tire painted mark at 45 or even 90 degrees to the stem, if doing so reduces the
         amount of weight needed.  VERY FEW motorcyclists do this, as they hate bead breaking after
         mounting a tire, and you must be careful with a tube.

    k.   Many modern motorcycle tires have VERY stiff sidewalls and are NOT very easy to put onto a rim.
         In addition, you MIGHT have a problem getting the tire bead to seat all around on both sides of the
         wheel.  Copious quantities of tire lubricant WILL help. Often the tire beads snap into place over a
         few minutes. 
A big help is to have the tire, wheel, tube, etc., all in the hot sun for
         quite some time, before and during ANY tire work.

         Use of too high pressures are dangerous.  I will give you some hints/advice that will work for
         you....but some of these are only for the shop/garage situation.

         Occasionally there are problems and even with repeated inflation, deflation, inflation, a clean rim and
         lubricated bead, the tire may not seat.  This usually happens on just one side of the wheel and on a
         smallish part of the diameter of that particular bead.  While it is true that....in VERY rare instances,
         a tire is faultily made...or a rim unequal on each side (usually due to straightening of the rim at some
         time), those are VERY rare instances.

    l.   
To avoid problems, I recommend that you follow ALL my suggestions FIRST, ahead of
          time...as best you can with your equipment, ESPECIALLY when doing a tire where your
          compressor and tank are available, and, frankly, here I mostly mean your own garage/shop,
          although some of my suggestions can be done anyplace:

         CLEAN the rim inside bead area wall, so it is clean & very SMOOTH...this allows the tire bead to
         slide up the bead area MUCH easier during inflation.  Use liquid solvents first, finishing with fine
         sandpaper, then clean off any sand from the sandpaper, and then WASH with soap and water to
         remove any remnants of prior tire lubricants, etc.  I cannot over-emphasize the need for a clean &
         smooth rim where the tire bead seats.   This is VERY helpful for both tube and tubeless tires in both
         spooning-on, AND in later having the tire set fully to the rim.    Doing it properly will reduce your
         swearing and labor...a lot!   A rather minor-appearing irregularity on the rim bead surface will become
         a point of substantial friction, which you do NOT want, once the tire bead is in contact with it.


         Do NOT leave the Schrader valve core inside the valve stem when trying to seat the beads from your
         compressor's tank.  That valve, together with perhaps your air source being of too low a pressure,
         or too small a tank or no tank, too restrictive a hose (or chuck!!)....may not allow a fast-enough
         inflation.  
FAST inflation is one of the super-secrets....otherwise, the lubricated bead STARTS to
         move and seal, and then hangs-up.   Many have very considerably overinflated a tire (to quite
         dangerous pressures) and still could not get the bead to seat. 


    m.   For tires withOUT tubes, there is another possible problem, & that is to get the tire to even start to
         seal to the rim, let alone fully seat/seal.   This is ESPECIALLY a problem if you have a very output
         compressor (12 volt, on the road??) or limited large CO2 bottles.  The answer is almost always a
         big belt or rope used as a tourniquet, around the entire circumference of the tire. Use a large tool of
         some sort, even a piece of wood, to tighten the tourniquet.  

    n.   So, heed my hints!  I cannot overemphasize the need to do what is in this section!
        
HAVE THE TIRE & WHEEL HOT!   Remove the valve core & use a compressor hose, & associated
         parts including fittings & airchuck, that flow fast in volume. DO USE a modified airchuck that will fill
         the tire FAST.  (with well-lubricated tire bead too, of course).  A several gallon size (OR MORE)
        
TANK at the compressor, high pressure (at least 80 psi, but 125+ is nicer) is
very helpful to supply
         the huge amount of air FLOW really needed.  Check that the air HOSE is of the 3/8" MARKED type,
         NOT smaller; or flow will be slow (low flow volume is BAD).  Do NOT purchase an air hose that has
         a small hole inside at either end fitting, 17/64" or 9/32" is needed.  The hose length is NOT very
         critical, but the shorter the hose the better.

         I have found that SOME quick-release hose fittings are quite restrictive.  It is best to avoid them.
         Modifying quick-release fittings is iffy...best to avoid doing that.

         OBTAIN AND MODIFY AN AIRCHUCK specifically for filling tires/tubes:   REMOVE the center pin.
         LEAVE the rubber washer in the chuck (after you modify the chuck).  DRILL the part of the airchuck
         that attaches to the air hose, for a larger size hole...all the ones I have seen are too small in
         diameter.  15/64" or 1/4" will be OK.

          USE REAL TIRE LUBRICANT, properly thinned.  USE A 2" wide cheap paintbrush to apply it
          quickly, and so both rim and tire bead are well-coated.  If it starts to dry, re-apply or use a water spray
          from a cheap plastic bottle sprayer.


    o.  I can't tell you a specific maximum pressure to try to seat tire beads; frankly I do not know what is truly safe
         for your particular wheel...let alone any particular tire. Motorcycle tire manufacturer's used to say not
         to exceed the maximum sidewall printed pressure by more than 50%.  Some said 150%...which they
         meant as 50% over the maximum sidewall printed figure, but that could be miss-interpreted as sidewall printed
         maximum pressure PLUS 150%.  I CAN say that THAT would be SUPER DANGEROUS. Recently, perhaps
         lawyers got involved with the litigious American's, as many tire makers are saying not to use higher than 40
         psi when inflating. Some of these same manufacturer's have deleted their prior higher recommended pressures for
         RIDING too! This all may fly in the face of perhaps 42 psi being a maximum on many sidewalls. 
         I like the old recommendations myself; & to restate them:  DO NOT use over 1.5 times the printed
         sidewall maximum. Speaking as my lawyer might advise me (besides not to say ANYthing), I am not
         advising you DO use 1.5 times.  
My information, which you are reading, is of how I PERSONALLY
         DO MY OWN REPAIRS.

         I would NOT want to inflate a tire so high that a rim exploded, let alone the tire be injured.   There is always
         the chance that a rim has been weaken, making things even worse! 
I never ever go over 65 psi. 
         I use a compressor that fills its tank to 125 psi, & I use all my previously noted hints about hose size,
         airchuck modifications, no Schrader valve core, etc.  I usually use a gauge in the hose fitments, to tell me
         the PSI that the tire is being filled to. 

        
Please keep in mind that while a pressure change from, say, 50 to 60 psi seems hardly much, the truth is
         that the pressure is POUNDS PER SQUARE INCH...and there is a lot of inside VOLUME AREA for
         those pounds.  Thus, the pressure on the wheel can be THOUSANDS OF POUNDS; and a change of just
         5 psi is a LOT, considered as on the total surface area.


         In my own shop/garage, I have a pressure regulator on the output of the compressor tank.  I set it
         for 85 psi when doing tire work.  That has been high enough to get enough air flowing quickly
         enough.  You might want to eliminate any pressure regulator, and thereby obtain a faster FLOW rate.
         Do NOT take the tire to any sort of too high pressure, however.  If you are the very anal type, you
         might want to fashion some sort of pressure gauge that is "T'd" into where the modified airchuck is
         is fed from the hose.  I have NOT had to do this.  YET.

         
I WANT TO EMPHASIZE THAT THE BIG SECRETS ARE THE RIM PREPARATION AND THE SPEED
         OF INFLATION (the FLOW RATE) AND HOT TIRE AND WHEEL. Once the WELL-lubricated beads
         snap into place on both sides of the tire, and not exceeding a safe pressure, I check the RIDGE that is on
         the tire near the bead, to be EQUAL all around, on BOTH sides of the tire.  IF NOT, I deflate, break that
         bead, lubricate, repeat the process. 
   If you do this procedure the way I have outlined, you will
         almost always have 100% good results THE FIRST TIME, AND NOT HAVE TO DEFLATE AND
         TRY AGAIN.


    p.  As noted earlier, I use REAL tire lubricant with a paintbrush.  Tire lubricant comes concentrated &
         looks like very thick jelly.  I thin it with water per the can.  If it dries out, add water from a hand-sprayer, or
         more tire lubricant.  DO NOT use lubricants that contain oils.  I am well-aware that some of you
         will use saddle-soap, dish detergent, soap, etc.  You have MY recommendations.
 


Vibration/Thrumming/etc.

A tire from any one given manufacturer is intended to be used with some other tire from the same manufacturer.
In a fairly large majority of instances, tires can be mixed by model and manufacturer with no or few problems.
In some instances they do not work well with each other.

Every tire has its own type of vibrations set up in the tire, and transmitted to the suspension, frame and you.
Even if the tires are perfect, and balance of wheel and tire is perfect, these vibrations still occur, and if the
front and rear tire were not designed to work with each other, strange effects can come about.

ONE of those effects is a rhythmic vibration and/or noise, something like a regular interval thrumming that rises
and falls in amplitude as speed decreases and increases, from any one speed.

In some instances, even the proper mating tires can do this, depending on wear patterns......and a LOT
of other things.

Some of these things, and/or causes, are not well-known or thought about. On Airheads, insufficiently
tight motor mounts, for instance. Shock absorbers can have a dead place that is exceptionally narrow
in stroke amount, and can cause vibration. If you change the loading on the bike, thrumming may
mysteriously appear or disappear.

Balancing the tires and wheels might only help somewhat, if at all....since often it is not the basic problem.
Just about anything that changes the characteristics of the bike in some way, will allow new or
different vibration modes.

Other items that are often at fault are twisted forks, forks with stiction, looseness almost anyplace, and
sometimes 'things' added to the bike that change vibration modes from the stock situation.  A flattened
center-section of the rear tire from normal wear.

In some instances vibration and thrumming begin after the front tire is worn, this happened now and
then with the Metzeler Laser, which is very compatible, due to tread design, with almost any rear tire.
The Metzeler Laser is hardly the only tire to have these problems now and then.

Braking that causes a worn place over one area of the tread, and not another, is a VERY prime cause.
This often comes about from either very strong braking and sliding on an abrasive surface, that
flattens, ever so slightly, part of the tire. The type of thrumming this causes can be exceptionally
pronounced.


My point is that before blaming tires and balancing, DO check your nuts and bolts, feel the front
end for the steering head tightness or looseness, and rear suspension too. Check the rear wheel
fasteners....they do have a torque setting, and those threads are never to be lubricated, and that
includes not ever using antiseize compound on them.  If you cannot find the problem, remove the
rear shock absorber(s) and test them over VERY SHORT movement conditions, in the SAME
vertical/horizontal alignment as if on the bike.

There ARE mechanical things with the driveline that can cause rhythmic vibrations. Usually an
experience wrench can determine, from speed and modest riding tests where the vibrations are coming
from. One of the high frequency vibrations that is difficult to figure out is the driveshaft that
was installed with out-of-phase U-joints.   See my phasing article.

SOME vibration/thrumming causing things can be serious, such as a loosening nut at the nose
of the rear drive; an internally failing cardan bearing, etc.
Phasing problems are usually more constant, same for internal problems.

 


NOTES
 

(1) Modifying the rear fender, rear sides and rear bottom on some Airheads, can make for MUCH easier tire/wheel removals.  This is easy to do, can be done so no one notices, and can be very helpful. The rear fender, a composite material, is relatively easy to cut with a hacksaw blade in a single blade holder, and easy to smooth that cut edge with a common file.  Using a piece of chalk (or?), mark the fender from the side opening, downward/rearward, smoothly, to the bottom of the license plate.  Do on both sides of the fender. Cut and smooth.     When done, the fender should end approximately at the lower edge of the license plate.  You can, not necessary, install a rubber mudguard, such as one from JC Whitney...or the ones I prefer, the BMW ones:
    Black:  46-62-1-230-766   or   46-62-1-238-996 
    White:  46-62-1-239-259 or -273.
    Check the dealerships' ETK's for number and fit/model....those numbers may be superseded or obsolete.  

If you do this smoothly and neatly, it will probably never be noticed by anyone as not being stock. It makes removal of the rear tire easier on the twin shock machines.

This is a photo of my 1984 R100RT that has the modification, including a mudflap.

 


(2) Those with Reynolds Ride-Off center-stands will have to fashion their own methods for tire removal, as
     the front tire is typically on the ground at the same time the rear tire is, making for difficulties when
     trying to remove the front wheel for a rear tire flat; that is, for tilting the bike forward as described
     earlier.   Parking the bike so the front wheel is over a curb, with the bike on the center-stand, is one
     idea...DO tie the center-stand to front exhaust pipe.  At home, you can jack the bike in some fashion
     that works well.  I typically use a 2 x 6 under the center-stand for tire work on Reynolds Ride-Off Stand
     equipped bikes.   See notes much earlier, about half-way down in this article.

(3) The Chitech folks have a booklet on doing tire changes. Good information, but rather obsolete in SOME
      ways now. 

(4)  Tire Pressures:
         BMW owner's booklets, and books like Haynes and Clymers, show BMW's recommended tire
         pressures for the recommended and standard tires at the time of manufacture.  At times, BMW
         issued Service Information Bulletins (SI's) on tire recommendations.   BMW sent SI's on tires to
         dealerships for some years during Airhead production.  BMW quit recommending tires for Airheads
         a long time ago. It is IMPORTANT to realize that BMW's tire pressures were always a compromise.
         It is also IMPORTANT to realize that most of the early types of soft sidewall tires are NO LONGER MADE.
         BMW's compromise was between comfort, handling, and tire life.   BMW continued this practice,
         more or less; up through the ~1985 model year.  After that time, pressures are more realistic for better
         handling, although some advice and experience will help.  Typically improvements are still made for
         handling, by some increase in pressure.

         Because of these things, IN GENERAL, BMW's tire pressure recommendations in their owners
         booklets (duplicated by such as Clymers and Haynes), before 1986, are OFTEN MUCH TOO LOW. 
         All this is in MY opinion.   PARTICULARLY with modern tires.   I suggest you be VERY cautious if you even try
         BMW's old pressures, which were in the high twenties for front tires, and low thirties for rear tires.....
         depending on load and speed.

         You can do your own testing, starting at low, or high, pressures.  I think you will find that FRONT
         tire pressures of about 33-36 will be correct; REAR of 38-42.  The highest of those pressures
         would be for high speeds and/or high loads, or very aggressive riders in twisties.
         Pressures are always done with a KNOWN ACCURATE gauge, tires cool, that is, UNridden, and NOT
         sitting in hot sunlight.

          More information on tire pressures and a lot more are in section5.htm  


(5)  Here is a photo of not just simple studs, but extreme studding, used for ice-racing, etc.
      This particular photo is of a front wheel.  I will eventually add more information here, on all
       sorts of studding, chains, ropes, etc., for front and rear.
        

(6)   Not many of us ride on the original ribbed front types any more.  They do tend to follow rain grooves, contrary to what is said in some Clymer's publications.   Still, you MAY want to try a set, as they DO deliver the classic ride and handling that the bike was designed-for; and ...note here, that these tires generally work best at the originally recommended by BMW tire pressures (label was under the seat, see your owners manual too), or slightly higher (by 2 psi front, 3 psi rear, typically).  Also note that these tires DO give decent mileage before they wear out.   If you have a modified suspension, the classic ride and handling will be modified.

MANY 'modern' tires require considerably higher pressures than stated on the tag under the seat or in the owner's manual or in some tire manufacturer's literature.

(7)  THE TIRE PRESSURE LISTED ON A TIRE SIDEWALL IS NOT....NOT!!!!.....THE RECOMMENDED TIRE PRESSURE.  IT IS A MAXIMUM TIRE PRESSURE, BASED ON WHATEVER STANDARDS THE MANUFACTURER USES.

 

 

Rev:  
07/26/2008:  All prior updates incorporated, and article revised extensively this date
12/28/2008:  Edit for clarity.  NO substantial changes.
11/01/2010:  Expand on #5
02/19/2011:  Revise numbering, add section on exactly how to repair inner-tubes
04/11/2011:  expand on why I dislike CO2 cartridges
08/29/2011:  Add info on bestrestproducts TireIron BeadBrakR, inadvertently left out of this
                      article several years ago!
03/16/2012:  update slightly for clarity
05/03/2012:  Add photos for second method of tilting motorcycle forward.  Clean up the article
                      in various places.
10/15/2012:  Add QR code, add language button, update Google Ad-Sense code, modify
                      photo, other minor stuff.
12/15/2012:  Add photo of studded front wheel at item (10)
03/11/2013:  Minor improvements to the article. Add entire section on how/why flats occur.
04/22/2013:  Add more on tire pressures.
04/24/2013Add more information on difficult-to-mount tires. Revise whole article for better clarity.
04/25/2013:  Additional tests proved that some couplers & excessive hose lengths DO detract.  Added
                    the information & did extensive final editing on all parts of this article.
05/26/2013:  Add Tusk inner core valve stem tool description and photo, and revise section i.
07/02/2013:  Add section on vibration/thrumming

 

Copyright, 2013, R. Fleischer

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