Renthal Street Rear Sprocket - 41T 462--525-41P-HACNC machined (not stamped) and feature a computer aided ultra light design to reduce unsprung weight and increase power transfer Rear sprockets made from high strength, specially enhanced 7075 T6 aluminum that is 33% lighter than steel to further reduce weight and increase power transfer without sacrificing strength Rear sprockets also feature a special tooth profile that allows the chain to roll easily on and off the sprocket for longer wear, less