peoppel

The best tubes to use are to switch to presta tubes. The benefit is that they have a screw down locking nut that keeps the valve in place. It also requires a different tip on the bile pump. Usually the bike pump head can be screwed apart to turn the mechanizm around to accomodate this. I agree with the other posters that youprobably have a mismatched tube. If the tire is a 2.25 and your using a kmart special one size fits all, the tube will not be as form fitting to the tire. Always pre-inlfate the tube till its round before iserting it into the tire prior to re-assembling the tire on the rim.

bike nut