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flat tire

So, twice now, I've broken off the tip of my tire's Presta stem while trying to disengage a bike pump from it. I've also been successful around a dozen times in the last six months, I would guess. Anyone got any hints for making this not happen again?

Comments

( 6 comments — Leave a comment )
nuclearpolymer
Sep. 30th, 2010 11:03 pm (UTC)
I sometimes have bent my stem doing this. I think it must be a matter pulling the pump off vertically rather than having a horizontal angle, but I have no tip for how to ensure this.
awfief
Oct. 1st, 2010 12:05 am (UTC)
I'd go to a friendly bike store like Bikes Not Bombs or Broadway Bikes and ask if they have tips, and if you can practice with older presta tires.
totient
Oct. 1st, 2010 02:54 pm (UTC)
I have more Presta tubes with holes in them than I'm ever going to fix, if you want some for this purpose.
katybeth
Oct. 1st, 2010 02:05 am (UTC)
Schrader. :)
(Deleted comment)
totient
Oct. 1st, 2010 02:31 am (UTC)
Don't rush it. It's OK for the pump head to be on there for a few seconds after you release the lever -- the valve will do its thing and the air will stay in your tire in the meantime. Make removing the head be a separate motion from releasing the lever and you'll be much more able to take the head off straight, and much less likely to break off the valve stem.

Edited at 2010-10-01 02:33 am (UTC)
( 6 comments — Leave a comment )