6

This question, What's the cause of the tyre cut, got me wondering if there is anything that can, or should, be done to repair small cuts in the tread of a tire. As I was looking at the damage to the tire it seemed like a bit of Shoe Goo or a similar substance might help to keep the tire from picking up other foreign material that might either work its way into causing a puncture or further damage the tire in some way.

Or is there nothing worth doing for a small cut like that?

enter image description here

  • 1
    There is nothing practical that you can do to repair a cut in a tire. Using goo in the cut would only make it more likely to pick up other junk. – Daniel R Hicks Nov 10 '15 at 3:29
10

We've tried at the local bike coop, and nothing really works. A shim or boot on the inside helps but putting anything on the outside won't last.

Even using rubber cement and a puncture plug (like a car tyre) doesn't stick very well because bike tyres are not very thick, so there is insufficient "meat" for the plug to bond to. If you make the plug longer, it becomes a spike aimed at your tube and pressing in every rotation.

Prevention is the only option, and that's not always a viable answer.

Narrower tyres could help too, you're sweeping a thinner ribbon of roadway with your rubber.

Someone else might like to comment on tyre sweeper wires, but I've never used them and to my mind the damage is already done once your wheel has ridden over the sharp thing once.


Later: I have successfully extended the life of a holed-tyre by adding a boot on the inside of the tyre using one of those horrendously thick patches that we all seem to have but dislike using on tubes.

The trick was to invert the tyre, and buff the inside very well with an abrasive like a file intended for buffing the tube. Otherwise I treated it like a normal puncture repair.

The only ordering change was to return the tyre to its conventional outside-outness after applying vulcanising fluid and while it set-up, and before applying the patch. I also used the biggest thickest patch I had.

I do not recall if I attempted to add a second patch diametrically opposite the wheel to offset the weight, might be a wise plan.

If your hole is under 2mm in diameter, give it a go. Your only loss is a patch and some fluid, and your time. If the hole is bigger than 2mm then sorry, its new-tyre time.

  • 2
    That tyre is dead and needs replacing. In the old days (race-)cyclists had a piece of stiff wire attached to the brake-bolt that would skim the surface of the tyre thus removing grit and bits before they could embed any deeper. I have tried it when for a while my daily ride took me over a stretch of thin gravel and I always had tiny stones sticking to the rubber. The wires kept the surface clean but they need careful adjustment. – Carel Nov 10 '15 at 8:36
2

If the cut is through the threads under the tread, so you can see the split on the inside of the tire, then as people have noted, you can try something like a patch on the inside but the effectiveness of this drops pretty quickly as the size of the cut through the threads gets larger. Note that typically tube patches are pressed against the inside of the tire, helping to create a good seal. Using it on the inside of the tire places much more pressure on the patch than it typically would have to hold.

New contributor
glockenspieler is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct.
2

You can sew the cut together using a needle and a thread. Unless you are using a tubeless setup, you do not even need to patch/seal it afterwards. If you do need to seal it, you can place a patch over the stitches. There are tutorials available on the internet. Even in the form of videos

The thread to be used should be of high quality for better durability. Especialy if the cut is in are where the contact with the surface is more likely. Cotton threads deteriorate quickly when wet. Synthetic materials like nylon or at least polyester of sufficient thickness should provide better resistance. Some reported using a fishing line.

  • 1
    How do you do the stitches in such a way that they won't be touching the road and thus being rubbed away almost immediately? – cmaster - reinstate monica Feb 11 at 21:14
  • Arguably, this method is better on the sidewall and for larger tyres. Finding a thread with good abrasion resistance is crucial. A basic cotton thread is hopeless. Cover it with a glue. The one used in the video or the Aquasure I use to make the threads on my caving oversuit abrasion resistant. Might be enough to keep the tyre working until the end of the holiday. On the sidewall it can stay very long. Some tyres are cheap and may be only slightly expensive than the glue - no point then. Mine are much more expensive. – Vladimir F Feb 12 at 7:44
  • In that case, it would be good if you added info about the thread to use to your answer. Without it, the answer is simply incomplete imho. – cmaster - reinstate monica Feb 12 at 9:30
1

Try taking the tire off the rim, an use Krazy glue to shut-close the cut. Then boot the tire from the inside. If you have an old useless inner tube, cut a nice piece and use it to glue it inside the tire. I have put about well over 2000 miles after I did three of these repairs from 1" screw-incurred flats on my rear tire in my commuter bike.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.