Tires are hand built in France on a natural cotton casing, offering the best in both suppleness and low rolling resistance. The Super Mud is the ultimate mud tire, 48 mm valve stem length is standard. FMB Cyclocross tires feature a superior sidewall coating factory installed. Available 700 x 33 standard size. 700 x 28, 700 x 30, 700 x 32, 700 x 34 on special order. Black / gum sidewall, white tread / gum sidewall.