This 48-tooth Delrin main (spur) gear is intended for use in the HPI Savage 21 RC platform and is supplied as 1 pcs. It is an RC-scale drivetrain component made from Delrin to provide a balance of low friction and wear resistance without implying performance claims beyond its material properties.
Fitment and installation should follow the Savage 21 chassis service procedure: access the gearbox area, remove the existing main gear assembly, inspect mating teeth and bearings for wear, and install the replacement gear while maintaining correct gear mesh. Use standard checks for backlash and mesh rather than altering other driveline components.
In tuning terms, the Delrin spur gear serves as a direct replacement part and a maintenance item; it does not change gear ratio unless a different tooth count is used, but it can affect noise and smoothness compared with metal alternatives, so verify fit and run-in behavior after installation.
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