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 more commanly found on mtb wheels as valve is larger and won39t fit through 650c rim valve holes 650c wheel sizing be aware that when purchasing a