sidewall chafe: ways to prevent it getting worse?

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  • I’ve got a run of about 15cms on one tire where an incorrectly-set brakepad snagged the sidewall and the surface is now chafed.
    Is there a tire equivalent of shoe goo that will help to stop this getting any worse?
    Winter set of Marathons, I really don’t care how they look, as long as they work.
    Cheers...

  • How bad is it? Are the threads exposed, torn?

  • it’s a very thin line, there’s a small amount of whiskery stuff for about 8cms. No daylight visible through it!

    edit so, a top layer, maybe?

  • Whiskery stuff is the threads, I imagine. At the shop I always recommended changing the tyre if the sidewall threads were exposed, and definitely if they’re frayed, or you’re potentially risking a blowout.

    If you have a relaxed riding style and are certain the tyre’s structurally sound and want to go ahead with it, vulcanising rubber solution works on tyre rubber too, you’d just need to clean it really well with isopropyl alcohol then proceed like you would an inner tube. There’s bigger puncture patches marketed for motorcycles online, they work the same but you’d want to use clamps or heavy books to hold the patch down while it vulcanises. It won’t do anything to strengthen the sidewall structure, but it will help protect the threads from further external abrasion. Obviously you wouldn’t be able to see the threads later on to check if they’re ok.

    Sorry for the bummer news, at the end of the day it’s your call. Just at least put it on the back wheel because a front blowout on clinchers and rim brakes can be even more dangerous than on the back (which is also dangerous).

  • Can you post a picture?

    I had this previously with marathons and decided to keep going for thousands of km afterwards.

  • Thanks @Hjusth for the assessment of the risks (and fixes) and cheers too to @wot for the anecdata on how these things can go.

    I tried to find a new one, but can’t find stock anywhere (this is a 50-559 Supreme).
    I’m going to try the gluing and patching route, and if it feels okay, stick it on the rear. I wouldn’t exactly say I’m going to be killing it - it’s average 25km rides around London roads. I’ll keep an eye on it and replace as soon as something comes up. Bummer for sure - I’ve got three sets of (different) 50-559 tires all with one of each set with some kind of damage!

  • If it is superficial but you just want to stop possible fraying, I would just use Shoe Goo or equivalent. I have some 'wetsuit glue' which may even be the same stuff. You can get it in black, but also clear for your tan walls.

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sidewall chafe: ways to prevent it getting worse?

Posted by Avatar for vilms5000 @vilms5000

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