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Old 01-16-08, 02:15 PM   #1
nayr497
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tire mounting issue - tube pushing tire off rim

I'm having a weird problem that I can't figure out. I am trying to put new tires on a rim but when I get above 80 psi the tube pushes the tire off of the rim.

- rim is a 700c Araya from an older road bike (early 1990s)
- tire is a Vittoria Open Corsa Evo CX
- tube is a Bontrager 27x 7/8 - 1; 700x18c - 25c

I have used Vittoria tires before...this model is described as "open tubular" but I thought that they would work fine with this type of rim.

I have maneuvered the tire back and forth to get the tube seated and I have mounted a lot of tires and never had this problem.

Any ideas?

Last edited by nayr497; 01-16-08 at 02:23 PM. Reason: mistake
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Old 01-16-08, 02:59 PM   #2
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Might need to clean out the BEAD SEAT area of the rim. So many old bikes have rotted rubber in the crevice that should hold the tire bead in. It doesn't take much to have this happen. If that does not do it, look at the bead on the tire and see if that is the issue. The bead needs to lock in, if it doesn't, it will roll off like you state.

The other thing to do is fill up the tire and tube with about 20 PSI and try and hand seat the bead on the rim. Make sure that it is even all the way around on BOTH sides. Then add more air and check again and again until you have the proper pressure.
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Old 01-16-08, 03:12 PM   #3
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Are you sure your rims are hook bead style? Many older rims are not, and thus cannot handle higher tire pressures.
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 01-16-08, 03:19 PM   #4
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Hmm, how would I tell if they are or are not hook bead style? I could get the tubes/tires I just took off up to 120 psi.
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Old 01-16-08, 04:12 PM   #5
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This recent thread may interest you. Also an Araya rim...

These aren't hooked rims are they? :-S
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Old 01-16-08, 04:19 PM   #6
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Hmm, how would I tell if they are or are not hook bead style? I could get the tubes/tires I just took off up to 120 psi.
http://www.sheldonbrown.com/images/b...t-diameter.jpg

that link points to a good drawing of a hook bead rim. But if the old tires could hold that pressure, it seems the new ones should as well. Are you sure the tires are the same size old to new?
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Phobias are for irrational fears. Fear of junk ripping badgers is perfectly rational. Those things are nasty.
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Old 01-18-08, 11:23 PM   #7
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that had happened to me once and i discovered the tube was actually to big for the rim also might be your tire is too big,thats all i can see being the problem
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Old 01-18-08, 11:24 PM   #8
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ps 80 psi isnt bikes only suppoosed to be around 40 psi max?
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