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A place to ask bicycle repair questions, and for bike shop monkeys to share advanced non commercial wrenching resources (no YouTube self promotion). This is only for repair related topics.

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Tire bead (lemmy.ca)

submitted 6 days ago* (last edited 6 days ago) by apprehensively_human to c/[email protected]

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This is a Schwalbe studded winter tire I bought a few months ago, and I'm not sure what exactly I did to get it like this but for some reason the bead seems to be warped or stretched. It doesn't want to fit my rims. There's a small section of the tire that's popped out of the rim, and when I try to lever it back into place the bead pulls out further down.

I've tried this tire on two different rims with the same results, and to make doubly sure it isn't the rims I put on one of my old Schwalbe Marathon tires which fit perfectly. Both tires are 40-635 700b.

Is this repairable? I don't have much experience dealing with tires but I find it unusual that this tire seemed to be fine until now when I changed out the wheel.

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[–] [email protected] 7 points 6 days ago

Sure sounds like it's stretched, which means it's done, I'm afraid

[–] [email protected] 6 points 6 days ago

I'd go around the tire and make sure it's not over-seated too far in on the other side. Try to make sure it's evenly seated all the way around.

I usually do that at around 5 to 10 PSI with the rim mounted on the bike, so I can give it a good spin and observe for uneven seating on the rim, at low PSI to start with so I can work the bead in evenly by hand, then once evenly mounted, pump the tire up to full pressure.

If that doesn't do the trick, the tire just might be stretched or damaged, or perhaps the wrong size.

[–] [email protected] 4 points 6 days ago

I think this might just be a particularly uncooperative tire, but it should work if you wrestle it on there. Maybe post a picture of the whole wheel, there might be something here I'm missing.

[–] [email protected] 4 points 6 days ago* (last edited 6 days ago) (1 children)

Maybe a smaller inner tube? This happened to me once, it was the inner tube, too large.

[–] apprehensively_human 4 points 6 days ago

The tube is completely deflated and shouldn't be getting in the way.

[–] [email protected] 2 points 6 days ago* (last edited 6 days ago)

Start putting the 2nd side of the tire opposite side from the valve, and lastly at the valve spot. Bicycle wheels usually have a small indent in the middle of the rim, and you should try to move the tire bead there as you put it on the rim, allowing more clearance to work with.

If you have the valve stem somewhere else than at the very last spot, it will block the tire bead from dropping into this indent.

Some tires just are pain in the ass to install