HPI Racing Savage 21 drive gear 18-23T. This is a stock peplacement part. Gear is located in the transmission case.
This part comes with two gears in one.
This product includes one drive gear. Two 6mm e-clips. Two 2x12mm pins.
Diameter of 18 tooth portion: 20mm (0.79")
Diameter of 23 tooth portion: 25mm (0.99")
Height: 17mm (0.67")