Repairing Punctures


This page is in two sections. The first deals with my experience with repairing a puncture on the go in a tubeless tyre on my BMW F700GS (it was the rear tyre). The second is some hopefully helpful information I put together some time back when I owned a BMW F800GS

Repairing a Puncture in a Tubeless Tyre


Puncture on remote roadAre you well prepared to fix that annoying puncture in your tubeless tyre without having to call roadside assist or the local tow truck?

I've only had to do it once before; and had so many helpers I hardly saw what was happening let alone remembered anything.

So recently in a remote forested area I was confronted with the challenge. Fortunately, I was in the company of far more experienced riders so I didn't do much more than watch again.

But some lessons were learnt.

1. Getting the offending screw out of the tyre required some pliers. None in the repair kit! And seemingly none in kits on offer on the Internet! Fortunately, one of the group had some in a tool kit. Without pliers, we would not have got any further so deeply embedded was the screw.

2. Opening up the hole with the reamer tool wasn't a too much of a problem despite the straight handle (see more on this below), although it was still an effort to get through the tyre.

3. The hook tool had a plus and a minus to it. The plus was the small gap at the tip of the tool that makes it easy to extract after inserting the plug. The minus was the straight handle that made it difficult to insert the plug. Many kits on offer have a T-shape handle on both the reamer and hook tools. Much better!


Tools in my kit4. You need to cut the excess plug once inserted. No cutting instrument! Again, someone to the rescue with a penknife. Some kits on offer include a cutting instrument.

5. Two of us had repair kits. But in both, the little tubes of rubber glue had dried up. Once opened (or the tube has frayed) they have a short shelf life. Take care!

6. Fortunately, someone had a small compressor to run off the battery. That beat my option of a hand pump. Or the other option of CO2 canisters (see more on this option below).

7. We also had a few bits and pieces strewn around that were not always easy to keep track of. A small groundsheet of some sort would have been helpful.

The upshot was insertion of a non-glued plug - difficult to insert without he lubrication of the glue (and with a straight-handled hook tool); and without glue on the plug, it leaked. But the job got me to a town servo in stages of 20km at a time before needing to repump.



Last point: at the servo where I got a reliable fix to get me home, the mechanic filled the tyre with air before he plugged it. Said it expanded the hole and made it easier to insert the plug. After that, the tyre can to pumped up again to the desired pressure. Of course, at that stage we had use of the servo heavy duty compressed air machine!

My new kit laid out on groundsheetThe basic lesson for me was to make sure I have all the necessary bits and pieces so I don’t get caught short, especially if it was only me on the road somewhere remote.

Here’s my check list for a repair kit (more or less in order of using them):

  • A small groundsheet of some sort – just to keep bits and pieces out of the dirt or from getting lost in the grass (A3 or even A4 size would suffice). That's about A3 in the pic.

  • Pliers

  • Reamer tool – with T-shaped handle

  • Plugs – enough to ruin a couple and to cover more than one puncture on a tour

  • Hook tool – with T-shaped handle

  • Rubber glue – in fresh tubes
  • Cutting instrument of some sort (e.g., a blade in the pliers in pic)
  • Air supply: hand pump, compressor or CO2 canisters – with the canisters you’ll need an insulator or gloves to avoid frost bite!
  • You could add a small light of some sort in case you get caught out at dusk or at night.


Video of Plugging a Tyre

Here's a short video demonstrating how to plug a tubeless tyre:


Co2 Cartridge Inflator Test

This is worth a read. The results differ a little from what's said in the video above, but the bottom line seems to be that you'll likely go through a few of the 16g canisters (seemingly the common size in repair kits) to get the tyre to a reasonable pressure. Just don't have a second puncture before you reach home or a servo.

This is an edited/redacted version of what's on this
forum site:

"Every once in awhile I see someone ask a question about the effectiveness of Co2 cartridges for motorcycle tire inflators. It seems that repair kits with Co2 inflators are becoming more popular. I think that’s good from the standpoint that people have more options to deal with a flat in an emergency.

The cartridges come in three popular sizes in terms of volume of air: 12g, 16g and 25g, where “g” refers to grams.

Now the question is what’s needed to fill a motorcycle tire?

I decided to waste 4 of our 16g cartridges and on the rear tire of the Versys 1000 (tubeless, 180/55-17, 42 psi).

When the air discharges from the cartridge it becomes super cold. Some have said it gets cold enough to burn skin. I’m not putting that to the test. The way it works is once locked on the valve stem, the inflator barrel is slid backward along a track and held there to discharge the air. There’s a big woosh and the rest streams out over 8-10 seconds.

The first cartridge was quite a bit short of filling the tire.

The second cartridge showed a one-pound improvement over the first.

The third and fourth cartridges were consistent with the first two. Note that the cartridges get all frosty.

So, the average psi per 16g cartridge was 5.5 psi and all four pumped the tire up to 22 psi. This is actually better than I expected.

Applying a little math to the information obtained, filling the tire to its 42 psi spec would require 8-16g cartridges, 10-12g cartridges or 5-25g cartridges

Your conclusions about whether Co2 cartridges are a good idea or not would be interesting to hear. There are certainly pros and cons. However, as part of an emergency kit with no less than 4 cartridges, I think it may be all one needs to get to the filling station after a flat repair and get a tire filled properly. However, I think I’ll continue to carry my Air Compressor."

Call a tow truck before you resort to this fixCautions with Plugs

Is a plugged tyre okay to ride for the rest of the tyre’s life? Although there are lots of opinions about plugging in general, one thing’s for sure: plugging a tyre from the outside, as described above, might well be the only option for a fix by the roadside but it’s certainly not a permanent solution. It’s designed and intended as an emergency stop-gap measure only. Ride judiciously only as far as you have to in order to get a permanent solution.

The permanent solution is most likely to be a new tyre but it’s possible that an internal plug put in by a professional tyre repairer might suffice in some circumstances. Given how much life and limb depend on a tyre on a motorcycle, the safer option will always be a new tyre.

It should also be noted that tyre manufacturers emphasise that the temporary plugs described above are suitable only for the main treaded part of the tyre; not for the side walls or even close to the edge of the treaded part.

You might like to look at this article on plugging a motorcycle tyre. It covers pros and cons of plugging tyres and sets out some of the pitfalls.


Repairing a Puncture on the F800GS
Applicable to other tubed tyres with the right tools!

This includes removing and replacing wheels.

Never having repaired a puncture on any on my motorbikes (at the time this was written), I’m not really in a position to tell anyone what they should do or how they should go about it.

Ahead of setting out on a trip on my F800GS, I thought I should learn how to repair a puncture; and not tempt fate, as I probably did on my Old Mail Routes trip, where there were some lonely, phoneless spots, including where I came to grief.

I also might have been a bit adventurous in taking my F800ST up the Oodnadatta Track during My Big Trip North, where I might not have even got mobile phone reception let alone easy access to Roadside Assistance! But, at least the F800ST had tubeless tyres and I had those magical plugs and a small hand pump, even though at that time I most likely lacked the ability to use them effectively.

So, now, with the tubed tyres of the F800GS, I figured it’s imperative to know how to AND be able to fix a puncture.

This page is mostly focussed on the more challenging part of repairing punctures, namely, removing the wheels – and replacing them; and removing the tube. Hopefully, the actual repairing of the puncture will be spelt out in the repair kit you’ll need to have.

The Tools You’ll Need

What motivated me to write something on tools you'll need was the discovery of two things:

  1. There’s at least one illustration in the instructions in the F800GS manual that is different from what’s on my bike. That’s the front brake calliper ‘screws’.
  2. The manual also identifies the need for a 22mm spanner for removing the front axle, although a 17mm spanner is included in the tool kit.

As far as I can ascertain, you’ll need the following tools:

Front Wheel

To remove the brake calliper (# 1 in photo), you’ll need an E12 Torx Socket.

To remove the ABS sensor (# 2 in photo), you’ll need a T30 Torx Driver. (But take note of description in video clip about removal - or not - of ABS sensor.)

To slacken the axle clamping screws on both sides (# 4 in photo), you’ll need a T45 Torx Driver. (The tool kit includes a 40 Torx Driver but I'm not sure why.)

To remove the axle screw (#3 in photo), you’ll need a 17mm spanner. (Not a 22mm as indicated in some places.)

Rear Wheel

To remove the speed sensor (# 5 in photo), you’ll need a T30 Torx Driver.

To remove the axle nut (# 6 in photo), you’ll need a 24mm spanner.

To slacken lock nuts (# 7 in photo) and back off adjusting screws (# 8 in photo), you’ll need a 13mm open-ended spanner – preferably two of them. (But, as with ABS sensors, take note of how this issue is handled in video clip below.).


Photos of Where Tools are Needed


 Releasing callipers Two versions of calliper fasteners ABS sensor and axle nut


 

Axle clamping screws  Rear speed sensor axle nut, locknuts and adjusting screws


What You Have and Don’t Have

In the sparse ‘tool kit’ under the seat – at least as my F800GS arrived – there is a T40 Torx Driver and a 17mm spanner.

That leaves you short of the following: E12 Torx Socket, T30 Torx Driver, T45 Torx Driver, 2x13mm open-ended spanners and a 24mm spanner. It's not clear to me if all these are even included in the optional extra "service toolkit".

With these additional acquisitions, you should have everything you need....except, of course, an easy way of jacking up the front wheel, an easy way of breaking the bead (i.e. getting the tyre loose from the wheel rim), repair stuff to fix the puncture, and an easy way of pumping up the repaired tyre.

Other Handy Equipment

There are solutions to all these steps. I have them all covered...I think.

Except for the further key element of knowhow.

Setting knowhow or ability aside, the next things you could usefully have are set out below. However, there are always alternative options. I’m sure that several have proved effective, like rocks or stumps to jack up the front wheel (or the beer slab on the back as mentioned in the video below); the side stand of a mate’s bike to break the bead; or a hand bicycle pump to get some air into the repaired tyre. Short of these, the following would help:

Either out of paranoia or attraction to new toys, I was seduced at the Sydney Motorcycle Show into buying a Tyrepliers repair kit consisting of two tyre levers (supposedly cunningly designed so that one end releases the tyre and the other (without pinching the tube) secures it; a bead breaker; and a package of fixes for, at your choice, a tubeless tyre or a tube (or, as an optional extra, both).

Then, persuaded by a dirt riding colleague, I succumbed to purchasing a ForkStand designed for the F800GS by BestRest Products. This little apparatus, easily storable within the bike’s frame, keeps the front wheel off the ground to allow its removal.

Finally, another BestRest Products item, their Bike Pump, is 12v powered and comes with any number of options for connecting it to the bike’s battery without being thwarted by the BMW Canbus amps limitation.

More Tools

Life is not meant to be easy!

To assemble and disassemble the ForkStand, the instructions list the tools needed. In addition to toolks above, the list includes an 8mm spanner. You need that or a small shifter aka adjustable spanner. The latter will more than suffice for the function required. Finally the list has ‘multi-purpose pliers’. I think that’s basically to cut the ties that you have used to strap some bits of the apparatus to the bike’s frame.

You won’t get the bead breaker to work without a 17mm spanner to turn the bolt that forces the bead. An adjustable spanner would suffice. But, again, the good news is that you already have a 17mm spanner under the seat.

Removing and Replacing the Wheels

Unfortunately, removing the wheels is part of the process. And replacing them. Hence, identifying all the tools needed in the removal process.

In the early days of my 2010 Mt Isa Trip, I had new tyres put on the F800GS in expectation of some gravel road riding into the trip. What was particularly helpful was the tuition provided by Dave of Tyres for Bikes in Brisbane.

The following videos illustrate the main steps in the wheel removal and replacement processes. Dave doesn’t follow all the steps in the Owner’s Manual so they are presented here as illustrative only. Sound advice would be to follow the manual and get your work confirmed by a BMW dealer. (Note that this is a disclaimer!)

Front Wheel

This clip shows Dave, who could easily have won an audition for the job of presenting the demonstrations, removing and replacing the front wheel. (In case you've been here before, this clip is an edited and much shortened amalgam of the two original ones that used to be here.)



Rear Wheel

This clip shows Dave removing and replacing the rear wheel. As with the video above, it's a shotened amalgam of a couple of original video clips.

x


A Few Reminders

Some memorable gems from Dave of Tyres for Bikes – the wheel-changer in the clips above:

  • Make sure during puncture repair that you don’t put the front wheel on the ground in such a way that might bend the disc (they are fragile).
  • First put the bottom rim of the tyre onto the wheel. Then push the top rim of the tyre down at the valve hole to get tube valve into the hole. Put some air into the tube to prevent creases.
  • Slide tyre around the rim to ensure valve is straight.
  • Push the valve into the tyre with the nut on it to stop it going all the way in. This ensures that the tube is not pinched when resetting the bead.
  • Unscrew the valve when pumping up. Fill tyre and then stick the valve in. Then top up.
  • The nut on the valve can be raised from the rim to go up against the cap. This allows some flexibility if hitting a bump hard; and thus prevents valve bending or breaking.

Pressures

Dave’s advice for the F800GS was:

Front: 32psi. Rear 38psi. (This almost accords with manual for one-up unloaded.)

For the dirt, his advice was: Front 20psi. Rear: 26psi.

Since writing the above on pressures, I’ve learnt a lot more about this issue. The main thing I’ve learnt is that there are as many views about pressures for off-bitumen/dual purpose/adventure riding as there are numbers on the pressure scales.

There’s also a school of thought – partially or even substantially supported during the BMW off-road training course – that tyre pressure (i.e. the lowering of the pressure for off-bitumen riding) is not as crucial as many attest. A lot of informed opinion suggests a few psi below the recommended road pressure is a pretty good option for the whole trip of mixed bitumen and off-bitumen riding.

More serious off-road adventures especially on sand, bulldust, thick lose stuff mud etc might require some further pressure refinement.



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