Graves Motorsports Yamaha R1 Sprocket Cover for the 09-14 model R1. Machined from billet aluminum this Yamaha R1 sprocket cover from Graves' WORKS racing department is designed to protect your sprocket from outside objects, be a light weight replacement to the plastic OEM version and remove quickly. Developed through Graves Motorsports racing programs for the Yamaha R1 race and endurance bikes.