Tubes, 700 x 18-23, Select Valve Length, 32mm, 48mm, 60mm or 80mm PRESTA Valve Inner Tubes with optional Rim Strips and 16 gram Co2 Cartridges. Road, Triathalon, Recumbent. (27 x 1) 700c x 18-23 (27x1) 32, 48, 60 or 80mm PRESTA Valve Select valve length Replacement inner tube for a road bike, tri-bike, recumbent bike or other bike with the same tire size.