04-05-2014, 03:18 AM
I am not a fan of Presta valves,but they are used on narrow rims where a large hole used for Schrader valve would weaken the rim.
Sounds like you are not tightening the lock nut, check info here. Welcome back to riding.........
http://sheldonbrown.com/gloss_p.html#presta
Sounds like you are not tightening the lock nut, check info here. Welcome back to riding.........
http://sheldonbrown.com/gloss_p.html#presta
Never Give Up!!!