hey man ill test this out for you. I 've got a camera and lots of free time to shoot and im willing to pay shpping for all youll send me. pm me if you still want some testers.

presta valves arent widley used. the only main use of them is . bicycles wiht narrows rimmed tires becausde i schraeder is too big. these bikes usually include road bikes and some bmx bikes with narrows rims.