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Fat Bike Tire Won't Stay on Hookless Rim

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Fat Bike Tire Won't Stay on Hookless Rim

Old 01-19-19, 08:28 AM
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kmcrawford111
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Fat Bike Tire Won't Stay on Hookless Rim

Hello everyone! I am having an issue with Vee Snowshoe XL 26" x 4.8" tires (studded and tubeless ready, but I'm using tubes) staying on my Specialized Stout Pro (26", 86mm internal width) rims.
I got these at the end of last winter and used them a little with no problems, all the way up to 20 PSI. I wasn't hard on them and they seem to be in good condition overall. This year I can't get them to stay on the rims. At first it was just the front - the tire started to come off the rim. I've tried lowering the pressure in the tube, but even at very low pressures the tire just doesn't stay on. I've tried 3 different tubes, ranging from 2.5" all the way up to 5". I've tried them on both sets of (identical) wheels that I have. I swapped the rear tire to the front, and now I have the same problem there. I've even tried putting the tires back on the rear, and they don't stay on there either now. As soon as I put any pressure in the tube at all, even less than 5 PSI it seems, the tire just starts walking off. The rims are hookless, and the fit of these tires seems very loose to me. I haven't had problems with other tires staying on though, both in 4.6" and 4.0". My theory is that when the tires were new the beads were just tight enough that it worked once, but as soon as the tires were taken off and remounted they no longer fit well enough to stay on, and that the hookless design of the rims is a factor.
I've considered trying to set them up tubeless, but I don't see how this could help since they come off at very low pressures, and the shop I bought them from said the wheels aren't good for tubeless setup anyway. I like the wheels though, enough that I have 2 sets, so I'd to keep using them. I'm at a loss on what else to try with these tires though. Anyone have any suggestions? Or suggestions on another studded tire that might work better with my hookless wheels? Thank you!
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Old 01-19-19, 09:38 AM
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Crankycrank
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I would contact the manufacturer and see what they say. They may offer a refund/exchange or may have some tips to fix the problem. If no luck come back here.
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Old 01-19-19, 10:20 AM
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HTupolev
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You could try building up the rim with extra tape on the bead seat shoulders, to keep the bead taut and prevent it from sitting low on one side of the wheel and high on the other.

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Old 01-19-19, 10:46 AM
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Check the tires for damaged beads.
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Old 01-19-19, 09:59 PM
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Thanks everyone. How do I check for damaged bead?
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Old 01-20-19, 03:14 PM
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Originally Posted by kmcrawford111 View Post
Thanks everyone. How do I check for damaged bead?
No experience with those tires, so I don't know if they are steel or kevlar bead.

Steel beads are usually somewhat obvious when damaged. Steel bits sticking out ripping through the rubber, or bent and won't seat properly. sometimes the steel will be intact, but the rubber has torn off and causes the same issue. I'd look for a smooth bead with consistent shape all the way around.

Kevlar/folding tires are a little weird. I have one Hutchinson folding tire that will mount up fine, but it creaks and sounds like it's ripping/breaking. I think it's damaged in some way and not visible. I've seen folding tires run tubeless that blew off the rim that just wouldn't ever mount again. It seems possible to tear or stretch the bead without it being obvious.
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