replaceable Presta valve, seconded that.
I was also looking for replaceable Presta valve that is a little longer then the ones used in Asia bikes. The Presta valve that is on most tube mountain bikes tend to break off at the base. I have had it happened 4 times on the road. I usually have a flat then walk the bike then when I get to replace it I found that the base has been riped; off course due to dragging on the dirt. I replace the valve with the local made one but they are a little short for the double wall rims. I wonder if anyone know where I can get some in the states? The regular ones, I can't replace it once it fall off.