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Presta Valve question(4 posts)

Presta Valve questionkyvdh
Aug 30, 2001 9:39 AM
I broke off the threaded stem on my tube pumping up my tire. Am I right to understand that the purpose of the stem is just to make a positive valve seal and that the tube should still be functional? When pumping is it air pressure alone that opens the seal, not by pushing on the stem? Would you recommend scrapping the tube asap? Can the valve be replaced?
re: Buy new tubeBrooks
Aug 30, 2001 9:48 AM
Don't waste your time trying to fix a broken stem. Just pop for a couple of bucks and buy a new tube. Same could be said for fixing flats with a patch kit, unless you are out on the road and need to patch to get home.
re: Buy new tubeBreezydz
Aug 30, 2001 10:36 AM
I patch flats on principle. I toss the tube when there's a problem with the valve.
re: Presta Valve questionalex the engineer
Aug 30, 2001 10:39 AM
Unless it is a high$$ tubular, or a lightweight tube with a removable core, toss it. You could probably go on with it, if it broke on the road, but why risk it when tubes cost $4??