Mugen Seiki Light Weight Steel Mod1 Spur Gear (46T)This is a Mugen 46 tooth light weight spur gear for the Mugen family of 1 8 scale vehicles. Effects of Spur Gear Changes Gear Effects Larger Spur Increased acceleration Decreased top speed Use on smaller tracks for more punch Use with larger pinion to get , more overall torque, while maintaining the same gear ratio Smaller Spur Decreases acceleration, but smoother Increases top speed