The world's fastest Pulley Wheel system just got faster. The OSPW Aero has a lifetime warranty and is wind tunnel tested to have 40% less friction compared to a standard shifter, making it perfect for single starts or triathlons.

The system features a 15-tooth upper pulley and a 19-tooth lower pulley, as well as coated CeramicSpeed bearings to provide the absolute best rear derailleur optimization.