Renthal Grooved Front Sprocket 520 Chain Pitch x 14 Teeth 254 520 14GP 1994 Kawasaki ZX600 Ninja 600R 2008 Harley Davidson Sportster Nightster 2008 Harley Davidson Sportster Nightster XL 1200N Product Details Product Line Renthal Grooved Front Sprockets Part Number 257 520 12GP Fitment Type Model Size Specific Fitment Use Type Unit Sale Qty Each Style Grooved Size 520 Chain x 12 Teeth Position Front Material Case Hardened Nickel Chromoly Steel Color Natural Finish Sprocket Teeth # Renthal off road front chainwheels are chosen by more factory motocross and supercross teams than any other chainwheel on the market today Grooved chain wheels have cut outs at the bottom of the tooth to allow the escape of mud that would otherwise be trapped between the chain wheel and the chain