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Nearly new GP5000 has a 5mm cut on the side. I've already ordered a replacement as gut instinct is I'd always be worrying about a high speed blowout and crashing to death. But it feels a bit sad to bin a £50 tyre that's otherwise like new. Would anyone consider repairing this or is it just asking for trouble? I've tried gluing patches to the inside of tyres before but normal puncture repair glue doesn't seem to stick.
I successfully repaired a high end Michelin road tyre that a similar sized slash with some decent super glue. Surprised it held up, still on a spare wheel in the shed over a year later (probably done ~ 1000km on it)
Is it cut all the way through the carcass? I'd be inclined to repair and keep as a rear tyre
I'd not risk it. On a road bike the tyre pressures used are high as are the speeds so a tyre suddenly deflating would have dire consequences.
I've patched a very old GP4000 from the inside.
Can't remember how big the hole was, but big enough for a latex tube to worm its way out and pop.
I roughed up the inside surface, cleaned with IPA and used a normal puncture repair patch with normal glue. I then blobbed in some 'flexible' super glue from the outside, just in case. Has been fine since.
I don't believe a tube could deform a (relatively) thick puncture patch through a tiny hole but you could test in the garagd by inflating way over pressure and seeing how much the patch deforms through the hole?
Edit: that's good point on moving to the rear though, will do that before my next ride!
I've got a couple of old worn out lightweight road tyres that i chop up the sidewalls from to use as patches for damaged tyres.
Most tube patches won't hold anything very much in the way of pressure, they're stretchy. Tyre side walls aren't.