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 the long valve inner tubes enables you to use deep section rims 40mm 50mm and above as the shorter valve would not extend out of the rim valve hole shorter valve inner tubes are ideal for wheels with rim depths of 24mm or 30mm presta valve tubes are most commonly used for road wheels 700c and on a few mtb wheels as the valves are thin wher