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Tire Bead Wants to Come Out

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Tire Bead Wants to Come Out

Old 11-29-17, 09:33 AM
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mtb_addict
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Tire Bead Wants to Come Out

So please tell me if this is normal or not...

I have this Kenda Kwest 26x1.5" tire. It is super easy to install and remove, without lever tools, just use my fingers.
The first time I install this tire it almost exploded in my face, if not for my careful attentiveness.
I mounted the tire and made sure the bead is on properly, then proceded to pump to 50 psi.
Before I got to 20 psi, I glanced at the tire and noticed there was a big bulch, and stopped pumping. The bead came out in one spot.
Anymore pumping, it would have exploded!!!
I release the pressure and pushed the bead back in. I pump to 10 psi or so, and massage all over the tire to make sure the bead stays inplace and carefully visually inspect it as I am pumping to nominal pressure.

Last edited by mtb_addict; 11-29-17 at 09:50 AM.
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Old 11-29-17, 12:01 PM
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rumrunn6
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that's the way to do it. some tires need more massaging than others. had some trouble remounting a tire last winter (out in the woods on a cold day, had 2 flats). couldn't figure out what the problem was until I discovered the wire bead was broken

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Old 11-29-17, 12:22 PM
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If you've had a problem from the beginning it's quite possible that the tire is defective. However, merely pushing the bead back into the rim is not enough. You have to first make sure that there is not a section of tube or rim strip that is not interfering with the tire properly seating before re-inflation. Also, you need to check to make sure another part of the tire is not too far in, rather than too far out. If you still have a problem I would suggest taking it back to the business that sold the tire to you, or call if mail order, and explain the problem.
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Old 11-29-17, 12:28 PM
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Another consideration: Tire beads and rims are made to be inside specifications. They very in circumference from manufacturer to manufacturer and from lot to lot. There are tires known to be tight and tires known to be no so tight. Same with rims. If all is well, all are within "tolerance" but even so, if the tire is pushing one way on that tolerance and the rim the other way, it will be either a tight fit or loose fit.

It sounds like you may well be mounting a looser fitting tire on a smaller diameter rim. Suggestion: buy a different brand of tire, telling the bike shop of this problem and and that you will want to exchange this new tire for another if it also proves to be loose. (Their mechanic may know well what tires work best on your rim. After all, mounting tires is a real part of what he does for a living.)

I haven't used Kenda tires but have the impression they are not the highest quality. I have had good luck with Panasonic tires (I use Paselas) and Vittoria tires.

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Old 11-29-17, 12:45 PM
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I like Kenda Kwest tires and have used their 100 psi 26 x 1.5 on several bikes. All worked well. I have used them on Alex DM18 and Velocity AeroHeat rims. As noted they are tool free install on these rims, BUT they were not tool free removal.

I also use their 28-622 and 35-622 on a couple of other bikes, on Velocity Dyad rims. They are tool free install and remove. These two have extremely flexible sidewalls, and as note above, the rims need to be free of tape and any other debris in the bead seating area. Veloplugs solve the tape issue, there is none. Veloplugs also give a bit more room for the tube during install and removal.
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Old 11-29-17, 01:39 PM
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Originally Posted by mtb_addict View Post
I pump to 10 psi or so, and massage all over the tire to make sure the bead stays inplace and carefully visually inspect it as I am pumping to nominal pressure.
That should be Standard Practice whenever you mount a tire.
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Old 11-29-17, 01:41 PM
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What are you putting this on? A 26 x 1.5 is typically a tire made for a rim with a BSD of 559 mm. If your rim actually needs 26 x 1 1/2 tires then it will have a BSD of 584 mm. So that's a possibility of why it fits so loose.
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Old 11-29-17, 01:46 PM
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Originally Posted by Iride01 View Post
What are you putting this on? A 26 x 1.5 is typically a tire made for a rim with a BSD of 559 mm. If your rim actually needs 26 x 1 1/2 tires then it will have a BSD of 584 mm. So that's a possibility of why it fits so loose.
Yes, I am aware there're two different 26" standards in the world.

This bike originally had 26x1.95 559 tires.
I replaced it with 26x1.5 559 tires.
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Old 11-30-17, 01:11 PM
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That sometimes happens with certain tire/rim combinations. You should inflate the tire slowly and stop every now and then to check that the beads are evenly seated.
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