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Tire Coming off Rim

Old 07-21-19, 10:09 AM
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kdawg7777
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Tire Coming off Rim

I bought my wife a new E bike (cruiser style - Pace Aventon 500 Step Thru) The bike came primarily preassembled w/ just some minor assembly - mounting handlebars etc. Anyway, I assembled and inflated the tires to 45 psi, and did a test run around the block with no issues. On her first ride, about 5 miles into a ride on paved road, the tire came completely off the rim, and the tube did not pop or puncture. (See Pic) What could have gone wrong? I assume it wasn't seated properly, but this has never happened to me in 30 years of cycling. Any Ideas? Should I reuse this tube and tire combination?

*I bought my daughter this same exact

No visible damage to tire, rim, or tube
bike a month ago, it has over a 100 miles w/ no issues.

Any info. would be greatly appreciated.

Thank You
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Old 07-21-19, 10:51 AM
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Kedosto
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Like you said, it probably wasn't seated correctly. Either that or when she bunny hopped into a radical horizontal slide at 28mph the sidewall collapsed.


-Kedosto
*got nuthin'*
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Old 07-21-19, 10:58 AM
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I don't know if this will work but I once had new tires that would come off. So, I started to use them with the least amount of air I could roll with and gradually increased pressure over time. Eventually, they took the right shape and stayed on.
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Old 07-21-19, 11:04 AM
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kdawg7777
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Originally Posted by hybridbkrdr View Post
I don't know if this will work but I once had new tires that would come off. So, I started to use them with the least amount of air I could roll with and gradually increased pressure over time. Eventually, they took the right shape and stayed on.
Thanks, I think that will be my next plan of attack
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Old 07-21-19, 11:11 AM
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My first reaction was that 45 psi is pretty high for a 2.2 inch / 55mm tire. I'd guess that around 30 psi would be a smoother ride.

Check the rim tape. It should be centered in the rim. When you remount the tire, does it just slide right over the rim, or do you need to use some effort to push it over?

You already know this tire mounting advice: Before inflating, go around both sides of the tire, checking for a fold of tube under the rim.

Inflate, and check the "bead line", a molded line above the tire bead. Spin the inflated wheel, and see that the tire doesn't dip down into the rim in one spot.
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Old 07-23-19, 12:46 PM
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Sounds to me like you've got a tight rim.

I got a bit carried away with the nipples once, ended up with a very tight rim, rubber came off, had barely even got going.
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Old 07-23-19, 01:13 PM
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Originally Posted by MikeyMK View Post
Sounds to me like you've got a tight rim.

I got a bit carried away with the nipples once, ended up with a very tight rim, rubber came off, had barely even got going.
That's what she said.
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Old 07-23-19, 01:19 PM
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Whenever I had to mount a new tire, particularly those that come all folded up in a box, I would first inflate to a low pressure, then roll the wheel by hand, pressing down hard to flex the tire and force the bead into place. Then I checked that the bead line was uniform, and if needed, rolled the tire again. Only then would I take the tire to full pressure and mount the wheel. Seemed to work, as I never had problems with tires coming off.
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Old 07-24-19, 07:09 AM
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What kind of tube inflated to 45psi can pop out of tire with no ill effect? Sounds more like tire was flat before it came off. Does it still hold air? If your story is complete and accurate you have strange, never seen parts on that bike.

Picture would help. None are loading. If previous poster is correct about tire size, yes, 45psi is needlessly high. But should not cause what occurred
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Old 07-24-19, 08:14 AM
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indyfabz
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Originally Posted by MikeyMK View Post

I got a bit carried away with the nipples once, ended up with a very tight rim, rubber came off, had barely even got going.
Family forum. Reported!
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Old 07-24-19, 08:15 AM
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Originally Posted by 63rickert View Post

Picture would help. None are loading.
You need 10 posts before you can post photos and links.
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Old 07-24-19, 08:19 AM
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I have seen tires come almost completely off a rim before, leaving the tube bulging desparately but not bursting. It's rare, but it happens - although usually only on the way to a full blast of exploding tube seconds later.

As others have said, remove the tire and re-seat, double checking the whole circumference on both sides for tube trapped under the bead of the tire, then inflate. Also check that the tire is seated evenly all the way 'round, and that the bead is not much deeper in some spots than others, as this usually indicates that the bead is much shallower in other spots.
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Old 07-24-19, 08:58 AM
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Originally Posted by MNebiker View Post
Whenever I had to mount a new tire, particularly those that come all folded up in a box, I would first inflate to a low pressure, then roll the wheel by hand, pressing down hard to flex the tire and force the bead into place. Then I checked that the bead line was uniform, and if needed, rolled the tire again. Only then would I take the tire to full pressure and mount the wheel. Seemed to work, as I never had problems with tires coming off.
This is exactly what I do.
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