Developed to fit in any small pocket, the lightweight S-Tubo-CX/Gravel tube is the ideal spare, and more Not only a savior in need, the tube can be used on a daily basis As robust as standard rubber tubes, but with a lower rolling resistance for an advantage over the competition Leftover tubeless liquids do not do any harm to it as wel Designed for disc brake use only Labeled Size: 700 x 30-40c ISO Diameter: 622 / Road / 700c Shaft Type: Smooth Valve: 60mm Presta Tube Compound: Thermoplastic Elastomer Weight: 35g. (42mm valve); 36g. (60mm valve)