HPI 2-Speed Lock Nut (Clockwise Threaded)

HPI Racing Heavy Duty Clutch Bell 15T/19T RS4 Super Nitro RS4 Racer 2 Speed

HPI 76969 Threaded Pinion Gear (19T * 16mm) (1M/2nd Gear/2 Speed)

HPI 76970 Threaded Pinion 20Tx16 For R40

HPI Racing 76963 Threaded Pinion Gear 18Tx12mm (1M/1st GEAR/2SPEED) R40

HPI Nitro RS43 22Tx12mm (1M) Orange Threaded 2-Speed Pinion Gear HPI106631

HPI Racing Threaded Pinion Gear 21Tx12mm (0.8M/1ST/2 Speed) HPI77011

HPI RS4 Nitro 3 19T Threaded Aluminum Pinion Gear HPI76979