These are optional HPI 0.6 MOD E10 Pinion Gears for the HPI E10 Drifter. A lower tooth count on the pinion gear will give you more acceleration, while a higher tooth count will give you extra top speed. Have a selection of pinion gears available so you can tune the speed of your car as desired!NOTE:..
IArrma Safe-D5 Steel Mod 0.8 Pinion Gears feature a D shaped hole that locks onto the motor shaft and helps to prevent the loss of drive and brakes if the set screw backs out. These gears are machined from steel for durability and fit 5mm motor shafts. Includes:0.8 Module Safe-D Pinion Gear(1) ..