520 Motorcycle Front Sprocket Fit For Husqvarna TC250 510 TE250 310 450 510 TXC WR SM450 Enduro Fit For Husqvarna TC250 TC510 TC610 CR250 TE250 TXC250 WR250 Fit For Enduro WR300 TE310 SM450 TE450 TXC450 TE510 TXC510 countershaft drive assembly Broached OEM standard inner splines; slides onto output shaft directly without drilling grinding or reshaping Optimized curved tooth profile delivers even torque output; prevents chain jump lowers off-road drivetrain vibration noise treated tensile chromoly material; strong wear resistance for motocross trail enduro harsh terrain CNC machined tooth contour uniform outer diameter; smooth stable meshing with Fit For standard 520 drive chain