Bicycle Mechanics - Can't get tire seated properly in wheel
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08-02-10, 05:39 PM
After fixing a flat due to shifted rim tape, I can't seem to get the tire seated properly in the rim. This has happened to me twice this year, on the same wheel. The previous two times I was able to work it out be deflating, and re-inflating, until the bead properly fit itself into the rim.
Not so this time. I've deflated, re-inflated, deflated, re-inflated, tried riding with low pressure, then re-inflating, etc., etc. Each time I still get that *bump* *bump* *bump* when I ride.
I know I'm not giving much to go on, but does anyone have any tips or tricks for this situation?
One thing that may or may not be relevant: These particular wheels are a real pain in the ass to get a tire onto. These are by far the hardest wheels I've ever had to get a tire on. (Every tire I've tried to put a tire on them has been extremely difficult; I've never had such trouble with other wheels). Is it possible that all the wrestling and pulling to get the tire on has deformed the tire bead? My hunch is that it's not likely, but I thought I'd throw that out there.
08-02-10, 05:45 PM
lube bead with water, soapy water, spit etc. inflate then work the low spot
08-02-10, 05:57 PM
Is the bead "climbing" up out of the seat on the rim? If so, is it in just one spot, or several? Just one side, or both? Try re-orienting the tire relative to the rim ("clock" the tire, say, 30 degrees clockwise on the rim relative to where it is now). Does the high spot occur in the same spot on the rim, on the same spot on the tire, or on some random new spot? This _might_ help narrow down whether it's a rim problem, a tire problem or a tube problem.
08-02-10, 06:09 PM
Strangely enough, there appears to be one low spot, not a high spot.
I'll try the soap/spit/etc., as well as rotating the tire (tho' the label will then be away from the valve stem, horrors). But it'll have to wait till tomorrow. Thanks for the suggestions.
08-02-10, 06:16 PM
A little more detail: I've always used a spray cleaner such as Fantastic/409, etc. Very slippery, does not harm rubber, not as messy as soap when dried and actually helps clean your rims and tires. Spray only the area that is not coming up as high. Carefully inflate the tire to full pressure and make sure that everywhere except the low spot is properly seated - bead line (raised ridge of rubber near the rim) the same distance from rim. then over inflate - 30psi is not unusual - until it pops into place. Deflate to proper pressure and you are good to go.
08-02-10, 07:24 PM
Over inflate the tube by 50% more than the sidewall pressure. That will normally finish seating the tire.
Put a little air in the tube before mounting. On my 700 road tires I find that blowing into the tube with my mouth as much air as possible gives the tube the right shape to keep it from becoming pinched under the tire bead.
08-02-10, 10:57 PM
We always used alcohol. it doesn't leave a residue on the tire or rim and drys quickly.
08-02-10, 11:53 PM
what wheelset and tyre combo are we talking about?
27 1/4" rim and putting on a 700c tyre?
tires have a "bead seat diameter"
and rims have an "effective rim diameter"
so for instance in the world of 700c
Personally I know that a set of Conti tyres and MAVIC rims, are easy enough to work by hand. no levers.
but a set of Shimano wheels... thats another story. Same with Campy wheels.
We always used alcohol.
I use alcohol to steady my nerves.
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