... ~18T 1)Inner hole 14-17 or 17-20 2)For ATV,Dirt bike,Go Kart 3)420/428/520/530 4 ... )45# Steel Performance atv quad sprocket 11T~18T,loncin 250cc atv parts,shineray atv partsPerformance atv sprocket 11T,12T,13T,14T,15T ... ,16T,17T,18T1)Inner hole 14-17 or 17-202)For ATV,Dirt bike,Go Kart3)420/428/520/5304)45# SteelFit ... hole 6 teeth 17mm-20mm 15 Tooth 520 20MM Sprocket for ATV Quad Dirt Pit Bike Parts