These steel upper gears fit the jackshaft of most Arctic Cats thru 2004 and Pre ‘96 Polaris machines. Heat treated steel, these gears are several times stronger than stock.
11 Wide = 1/2″ Wide
13 Wide = 5/8″ Wide
15 Wide = 3/4″ Wide
Ski-Doo HYVO Conversion Gear, Lower
11 Wide, 27mm-17 Spline, Steel Lower Gear
Yamaha RX-1 HYVO Steel Gear
13 Wide, 25mm-15 Spline Upper Gear