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Rim keeps cutting valve stem
#1
I'm looking for a solution. Getting tired of fixing flats.

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#2
What kind of rim - MTB / road?
What kind of valve.?
Where does it cut it?

[font=Trebuchet MS]Ride hard or ride home alone![/font]
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#3
I'm no expert but if I were you I'd be looking at my tyre pressure, probably needs to be increased. Check on the tyre wall for max. pressure and inflate accordingly. I had this problem once, the tyre was spinning on the rim and breaking off the valve stem.

Cheers.
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#4
Look at the valve hole in the rim. If there are sharp edges they keep cutting your tube. Take a large drill or a file to "break" (don't know appropriate English term) the edge. Also check if the rim tape is seated correctly and the valve hole is not too large.
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#5
Assuming you are fitting correctly, the commonest cause of tyre slip and subsequent damage to the valve is under inflation, read about it here, page 25.
http://www.schwalbe.co.uk/shopdata/files/TechInfo2-GB.pdf
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