Minoura BH-100 Bottle Cage Mount BH-100S: Fits diameter between 22 - 29mm Red logo printing color Fits standard handlebar and seat-post BH-100M: Fits diameter between 28 - 35mm Black logo printing color Fits oversized handlebar and fatter seat-post for mini-velo Quick release type holder Add an extra water bottle on handlebar or seat-post BH-100S has smaller clamp, and BH-100M has larger clamp