Renthal 99+ Yamaha Yz 125-250/ Yzf250-450 Rear Grooved Sprocket -

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 Special tooth profile that allows the chain to roll easily on and off the sprocket for longer wear, less noise and more power CNC-machined, feature a computer-aided ultra-light design to reduce unsprung weight