I have a next to unused GP5000 road tire, 25mm, which unfortunately has three cuts in the sidewall. I would like to ask, if it these constitutes a safety problem - or if they rather are to be looked upon like regular cuts in the tread. What is the verdict: dead or not dead? Thanks, Morten
I would not ride that tyre. Pretty sure I can see tube in the second photo, and that's asking for a sudden blowout.
You might choose to put a boot/patch on the inside of the tyre, JUST TO GET HOME.
You might boot it and use on an indoor trainer tyre only. Might be okay on rollers, would make a great front-wheel tyre for a direct-drive trainer (ie, the wheel that doesn't turn at all.)
I certainly would not choose to ride on the road with that ever.
It is dead, buy a new tyre.
Yes, but only to the nearest tire shop. While doing so, put the tire boots in your emergency tire repair kit to the inside of the tire, at the areas where the cuts are. Tire boots weigh next to nothing (three Park Tool TB-2 boots weigh 8 grams), and are also reasonably cheap, in fact so cheap that you shouldn't consider reusing them.
Tire boots are marvelous items, they can turn a tire with a full cut causing the tube to burst, into a tire that is able to contain an inflated tube inside. It's extremely rare to destroy your tire in such a manner that a boot wouldn't at least temporarily fix it.
If you find the tire contains the tube without boots, don't take your chances, use boots nevertheless. It's possible the situation worsens during the trip to the nearest tire shop, and that the tire would suddenly finally cut, and the tube would suddenly explode, causing rapid deflation.
I'd say it is a simple as that:
If there is any kind of deformation (as clearly shown on the groove above the cut): The tire is structurally impaired and ready to go into the bin. Same for any kind of damage that makes the tube shine through or bulge out. It will eventually fail and you're just waiting for it to do so.
I've been there and finished rides on damaged tires, but as soon as you are starting to think about whether your tires make it through the next ride, don't overthink and replace it.
Even a high-spec racing tire isn't worth waiting for it to fail big time, we're talking about replacement in the range or 50€/$/£, a fatal crash will cost far more if you just scratch your derailleur and bar tape. Therapies and job loss not included...
Of course not.
Why are you risking your life on the word of a bunch of internet strangers you're never going to meet or be able to hold accountable?
Go to a qualified specialist and have the suspect tyre examined…
Whatever else, please remember that if it does fail and any kind of law-enforcement finds out you Posted this query, you will have no weakest wheel to stand on.
Not hard workaround repair. Had similar with very long cut (whole side) on my loved Conti.
1st tried to glue from inside, but after some time or increasing pressure (often over 6 bar) tube went out again... Then found way better method - used plastic foil (peas package) around tube and tyre is reliable again ;-)
Also similar problem after 2 simultaneous ~3-5 mm long punctures / cuts of old Schwalbe - yellow puncture strip and tube was visible and soon went flat again - placed next tread cut from an old tyre inside and seems to work fine too, tire has a bit wider shape now, but would tell there is no noticable riding difference (front wheel).
Anyway it looks like hard broken tread is problem, but side with good tube support inside may not be at all - 3 years from fix / 12t km and no problems still.
Still riding the Conti (cut almost new 12/2019); daily commuting at least 12t km sum and no big problems, best fix was a thin flat piece cut from low resistance mountain tyre, inflating to 7-8 bars still and sometimes 50-68km/h downhill top speeds, back wheel for some time yet.