Super lightweight butyl tube even lighter than latex but not porous so no need to reinflate every day can also be fixed with a normal puncture kit shorter valve inner tubes are ideal for wheels with rim depths of 24mm or 30mm but are not ideal for wheels with rim depths of 40mm or above as the shorter valve would not extend out of the rim valve hole presta valve tubes are most commonly used for road wheels 650c and on a few mtb wheels as the valves are thin whereas schrader valves are