Continental Race Supersonic Tube Continental have over 100 years of experience in developing and producing bicycle tyres. Suitable for all makes of tyre, this ultra lightweight Inner Tube is available in both short and long Presta valves. It features seamless construction for a smooth feel and excellent handling. Ultra lightweight butyl tube 700c x 18-25mm Removable valve core Threaded Valve stem Available in long 60mm and short 42mm Presta valves Weight: 50g (manufacturer claimed)