This 48-tooth Delrin main gear is intended for the HPI Savage 21 and is supplied as one item. The Delrin material provides low friction and sensible wear resistance while being presented as a standard drivetrain replacement component.
Follow the Savage 21 gearbox service steps when fitting: access the gear area, remove the old spur and inspect the mating gear faces and bearings, then fit the replacement spur and set the correct mesh. Use established backlash and mesh checks rather than altering other driveline elements.
As a like-for-like replacement, the Delrin spur does not change ratio unless a different tooth count is chosen. Owners may notice differences in noise and running smoothness compared with metal spurs, so check fit and run-in characteristics after installation.
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