Front Sprocket - 13 Tooth - Yamaha Machined from high tensile strength, impact and wear resistant chromoly steel to minimize deformation, Inner splines are broached to provide maximum spline-to-countershaft contact to distribute driveline forces over the largest possible surface area, Heat-treated, then finished with a nickel coating for corrosion resistance and lubricity, Each sprocket is quality checked by Computer Measurement Machine (CMM) to exactly match OEM design specifications , Fitments available for Two Wheel Dirt, ADV, and ATV applications , Be sure to check for when ordering sizes larger than stock.