Motorcycle 520 Front Sprocket Pinion For BMW F650ST Strada GS Dakar G650GS 650X Challenge Country Fit For BMW single-cylinder 650 series Fit For including F650 Fit For Funduro F650ST Fit For Strada F650GS Fit For Dakar G650GS G650 X Challenge X Country X Moto, Fit For standard 520 pitch front drive pinion for OEM drivetrain replacement CNC machined spline inner hub tooth profile consistent with specs, seamless fit on output shaft without grinding or extra adjustment carbon with carburizing treatment delivers outstanding wear resistance, withstands long-distance highway touring rough off-road vibration load Optimized curved tooth design reduces chain friction running noise premature stretch, extends life of matched 520 drive chain assembly tooth options available for gear tuning; direct swap for worn front sprocket, part for chain kit overhaul gearing adjustment