SF360 Bike Tubes, 700 x 18-23 (27 x 1) PRESTA, Select 32mm, 48mm, 60mm or 80mm Valve Length, Street Fit 360 Tubes. Road, triathalon, hybrid, racing and other bike tires with same tire size. 700c x 18-23 (27x1) ISO 622 x 18-23 48mm Presta Valve Replacement inner tube for a road bike, tri-bike, recumbent bike or other bike with the same tire size. fixing a flat tire on a bicycle