Simplex Motorcycle Tires | Antique Motorcycle Tires The world's best restorers depend on Simplex Motorcycle Tires from Coker Tire Company. The detail and fitment are excellent for restored antique motorcycles. Clincher style antique motorcycle tires are unique and require experience that you can get from the Tire Experts at Coker Tire Company. These Simplex Cycle Clincher tires are available in many popular sizes in authentic tread designs. Coker proudly offers the most extensive line of vintage motorcycle tires in the world, including the rare and unique clincher style motorcycle tires.