2 Pack - Tubes, 700 x 18-23 (27 x 1) 32mm Presta Threaded Valve

Replacement high pressure inner tube for any bicycle tire with the same tire dimensions. With a Reinforce Valve Base and quality butyl rubber this tube is a perfect replacement for high pressure tires on triathalon, recumbents, road, hybrids and other high performance bicycles. Be sure to verify the valve type and length for the rims to be used on. CAUTION - When changing an inner tube and adding air for the first time, be sure to incremently add air to the tire and inspect the bead of the tire hooking into the rim on BOTH sides of the wheel. IF it's not hooking / beading properly then the inner tube can sneak out between the rim and tire causing a very loud boom! This can happen while airing the tire or some time after depending on how well the tire is hooked to the rim.