Vittoria Ultralite Road Bike TubeVittoria Ultralite road tubes in various sizes and varying Presta valve lengths Features: Sizes - 650 x 19/23c, 700 x 19/23c or 700 x 25/28c Presta Valve - 36mm, 42mm or 51mm 51mm Presta valve has a replacable valve core. Weights - 55g to 95g each depending on size BuyVittoria Wheels & Tyresfrom Chain Reaction Cycles, the Worlds Largest Online Bike Store.