Renthal 154U-520-50GRSI 50T 520 Pitch Ultralite Rear Sprocket Honda CR CRF 1980^Renthal 154U 520 50GRSI 50T 520 Pitch Ultralight Rear Sprocket Honda CR CRF This is a brand new, genuine Renthal Ultralight Rear Sprocket (Part Number 154U 520 50GRSI). This high performance sprocket is CNC machined in the UK from high strength 7075 T6 aluminum alloy, making it significantly lighter than traditional steel sprockets. It is designed for maximum power transfer and exceptional longevity. Compatibility: This sprocket is designed to fit a