HPI Savage 21 Delrin Main Gear (52T) by GPM DSAV1052T  [DSAV1052T]

Delrin Main Gear for Savage 21

This is a replacement main spur gear for HPI Savage 21 scale models, manufactured and sold as an aftermarket part by GPM. The component is an RC-scale Delrin spur intended to mesh with the Savage 21 drivetrain, providing a wear-resistant interface between the motor pinion and the rest of the gearbox assembly. The listing references the 52T tooth count in the name.

Installation is straightforward for standard Savage 21 gearboxes: remove the gearbox cover, retain factory spacers and bearings, fit the Delrin gear on the main shaft and verify axial position and backlash with the motor pinion. Check gear mesh at low throttle and rotate the drivetrain by hand to confirm smooth engagement before reassembling the gearbox cover. Use the vehicle’s standard hardware and follow safe battery and power isolation practices while working on the drivetrain.

In tuning terms this Delrin main gear serves as a low-cost wear surface and can be used when experimenting with gear ratios or frequent spur swaps, since Delrin reduces metal-on-metal contact and can simplify maintenance. It is sold as a single replacement piece and is intended only for RC model use on Savage 21 compatible platforms.