520 Motorcycle Front Rear Sprocket Kit For Kawasaki KLX250 S 09-20 KLX250SF 09-10 250 D-tracker 98-16 Fit For Kawasaki KLX250 S 2009-2020 KLX250SF 2009-2010 D-tracker 250 1998-2016 motorcycles Complete matched front rear 520 sprockets with standard tooth ratio for balanced offroad torque output splines bolt hole layout fit countershaft rear hub for direct bolt-on installation without Finely machined tooth profile minimizes chain slippage vibration on muddy, gravel uneven trail terrain density hardened body with smooth tooth surface reduces friction, extending chain sprocket life Uniform thickness design keeps stable rotation during cross-country trail riding daily street commuting