Upgrade your Yamaha with the RENTHAL Sprocket, designed for performance and durability. This 40-tooth sprocket (Part Number: 437U-520-40GBSI) is CNC-machined from a specially enhanced 7075-T6 aluminum alloy, ensuring it is both lightweight and strong. With an ultralight design, this sprocket is 66% lighter than traditional steel options, giving you enhanced acceleration and handling on the track or trail. The RENTHAL Sprocket features machined self-cleaning mud grooves at each tooth, which help to increase wear resistance, making it ideal for off-road enthusiasts. Experience the perfect blend of performance and longevity with this top-of-the-line sprocket. Elevate your riding experience with the precision engineering of RENTHAL, trusted by riders worldwide. Features: * Material: CNC-machined from a specially enhanced 7075-T6 aluminum alloy * Weight: 66% lighter than steel for better acceleration and handling * Design: Ultrathin design for optimal performance * Mud Grooves: Machined self-cleaning grooves for increased wear resistance