"It uses air pressure inside the tire to help shut the valve, but has a spring to assist in keeping the valve shut (especially important at lower pressures). The size used in bicycle tires has a greater diameter than the Presta valve. The spring pressure makes it better than the Presta valve for low pressure tires but the larger diameter hole it requires can weaken the rim."@en . . . "It uses air pressure inside the tire to help shut the valve, but has a spring to assist in keeping the valve shut (especially important at lower pressures). The size used in bicycle tires has a greater diameter than the Presta valve. The spring pressure makes it better than the Presta valve for low pressure tires but the larger diameter hole it requires can weaken the rim."@en . "Schrader valve"@en . . . .