HPI Differential Pulley Set for the R40.
HPI 48 Tooth Spur Gear for the HPI R40 kits.
HPI Battery and Receiver Cover Set for the R40 vehicle.
HPI Spacer Set for the R40 Kit. These spacers are used to set caster.
HPI replacement Bushing Set A for the R40 Nitro Pro Touring Car
HPI super chassis will knock 20 grams of weight off of your R40 with this LightWeight chassis.
HPI Lower Suspension Plate for the R40 Nitro Pro Touring Car.
HPI Belt Tensioner Set for the R40.
HPI stock Speed Shaft for the R40 Kit. The brake disk rides on this shaft.
HPI optional Front One-way Shaft and Pulley for the HPI R40 Kit. This part replaces the front differential.
HPI Joint Cups for the R40 On-Road Car. These mount to the differential and drive the dogbones.
HPI 4mm/6-32 Concave Washers for the R40.
HPI optional Solid Rear Axle for the R40. This replaces the rear differential on the car.
HPI Threaded Pinion Gear for the HPI R40 kits. 1st gear for 2 speed.
HPI Threaded Pinion Gear for the HPI R40 kits. 2nd gear for 2 speed.
HPI 22 Tooth Threaded Pinion Gear for the R40 Touring Car. This gear must be used with 42 Tooth Spur Gear.
HPI Threaded Pinion Gear for the R40. This threads onto the clutch bell and drives the spur gear.