Valve stem problems - Maintenance & Repair - Trailfu

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7/23/2010 10:09:13 PM BennieBiker Posts: 26	A friend of mine who I ride with frequently has recently been plagued with the problem of one or more flat tires on every ride. The cause appears to be that his tube is rotating around the rim, putting pressure on the valve stem, effectively popping the tire. Anyway, has anyone dealt with this problem? And are there any ideas for a solution? I had the idea to spray a tiny bit of hairspray on the inside of the tire to get it to keep from rotating, I've yet to test this method though. Thanks! -- Hardtail Junkie
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9/5/2010 3:26:11 PM fitztek Posts: 12	How can you tell the tube is rotating? and which way? like twisting or is it because the tire has a tear in the casing causing a lump? I've seen a lot of leaks in tubes at the base of the valve stem because the valve hole in the rim is too sharp and it cuts through the tube. The solution to that is just filing and sanding down the hole. I wouldn't recommend using hairspray because it'll be a nasty mess if you ever need to fix a flat. Also the tube needs to be able to move freely inside the tire when you are pumping it up so that you don't get a pinch flat. I would recommend coating the tube in a bit of talc powder or chalk so that the tube can settle into the position it wants to be in more freely.
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9/8/2010 5:11:29 PM tddrmrz Posts: 4	fitztek wrote: How can you tell the tube is rotating? and which way? like twisting or is it because the tire has a tear in the casing causing a lump? I've seen a lot of leaks in tubes at the base of the valve stem because the valve hole in the rim is too sharp and it cuts through the tube. The solution to that is just filing and sanding down the hole. I wouldn't recommend using hairspray because it'll be a nasty mess if you ever need to fix a flat. Also the tube needs to be able to move freely inside the tire when you are pumping it up so that you don't get a pinch flat. I would recommend coating the tube in a bit of talc powder or chalk so that the tube can settle into the position it wants to be in more freely. Agreed. I use baby powder.
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9/15/2010 5:55:54 PM BennieBiker Posts: 26	Ah yeah, I have been trying different options, and my local bike shop recommended the baby powder, it worked great so far! Of course I've only ridden it on a 7.5 mile XC race. Now the problem is I bent the front rim pretty good -- Hardtail Junkie
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