High quality tubes made in a variety of sizes to fit most motorcycles Valve Stem Types TR-4 - Short straight metal stem TR-6 - Straight metal stem (8mm dia) TR-13 - Straight rubber stem (11.5 mm dia) TR-15 - Straight rubber stem (16mm dia.) TR-87 - Short 90 degree metal stem (10mm dia) TR-87C - Tall 90 degree metal stem (10mm dia) PV-78 - 45 degree metal stem