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I bought a new set of tyres (Continental Grand Prix 5000). Being an idiot, I managed to cut the sidewall of the tyre with a knife while removing the packaging.

I have looked at repairing it, and came across items such as the Park Tool TB-2 Tyre Boot. However, I noticed that these fixes are only meant to be temporary, and not permanent.

Is it safe and advisable to use a tyre boot to repair a new tyre which I plan to ride 3000-4000km on, or do I need to cut my losses and just buy a new one?

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    How deep is the cut? Can you upload a picture? Apr 24, 2021 at 19:34
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    Buying a new one is the only and safest option. You could try to be creative and find some use for it.
    – Carel
    Apr 24, 2021 at 20:47
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    High tire pressures of road tires and the ability to go faster on road bikes make a sidewall cut on such a tire fatal to it, in my mind. Even if nothing ever happened, the presence of such a flaw would invite such disquiet in my head that enjoying the ride would be impossible for me. Then, what is the point?
    – Jeff
    Apr 24, 2021 at 21:29
  • No, the fix is not meant to be even temporary, as per instructions: "The TB-2 is designed for emergency use. A patched tire should be replaced as soon as possible.".
    – EarlGrey
    Apr 26, 2021 at 15:18
  • You know, I have heard of people cutting up sections of old tires to use as tire boots. This could be an option.
    – Weiwen Ng
    Apr 26, 2021 at 16:03

2 Answers 2

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No, a tyre boot will absolutely not be enough. Some side cuts are repairable by stitching. However, it is better for MTB tyres that use smaller pressures. I do not know if it is likely to work on a road tyre.

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As your gut feelings are telling you, no.

And unfortunately it's not even good as a trainer tyre. Unless you consider good "waking up your neighbours due to a loud bang in the middle of the night"!

Please consider the trigger for the failure (and the volume control for your booming alarm) is the pressure needed in such a small tyre. If you can run at 1 bar, you would be ok, the bang will not be that loud. But you would probably ruin the rim.

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