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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 10-05-04, 01:44 PM   #1
Bokkie
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I replace my Conti 2.6 tubeless tires with Conti 2.1's. My front wheel would then always deflate every 2-3 days or so. I removed the tire and checked the rim but I can find no evidence of rim damage or any sign of damage to the tire. So I switched back to the original which I'd been using for 2 years. Tonight, barely 40 minutes after pumping it up to 50psi, it was flat! Two tires with the same problem? Unlikely perhaps. All I can think of is that the value is at fault and I'm willing to replace it.

Do you think it is likely the cause of my trouble?

If so, can I replace the valve and is there a particular size I need to ask for or is one-size-fits-all? My rims are Mavic 3.1 UST tubeless by the way. Is it possible to overhaul the valve or reseat it, and if so, would I need to use any form of sealent?

Thanks.
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Old 10-05-04, 02:35 PM   #2
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Ok, now I am really out in the blue here cause I know nothing about tubeless tires, BUT, have you checked the connection rim/spokes for damages there?
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Old 10-05-04, 07:04 PM   #3
Rev.Chuck
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Could be the valve, could be the tire not seating well. If it goes down in fourty minutes, you should be able to find the source of the leak with a handy tub of water.
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Old 10-08-04, 01:34 AM   #4
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It was the valve. I got a replacement from the lbs and since then I've not had a deflation on the front wheel in 2 days so it looks ok now. I looked at the old valve and the rubber seal that fits on the inside of the rim was (a) a bit crusty with dirt, and (b) it seemed to have hardened a bit. Something to keep in mind if you use tubeless rims.
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