3Racing 3RAC-SG4871 71T 48 Pitch Spur Gear Racing Spec  [3RAC-SG4871]

3RACING 48 Pitch Spur Gear 71T - 3RAC-SG4871
Price:
USD$4.40
Brand:
3Racing
Model:
3RAC-SG4871
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Engineering Notes for 3Racing 3RAC-SG4871 in Race Setups

The 3Racing 48 Pitch Spur Gear 71T (3RAC-SG4871) is presented as a reference spur for racers refining gear ratios and mesh. Its 71 teeth in a 48 pitch profile provide a stable platform for ratio changes and predictable engagement during sustained runs.

Setup and Tuning Considerations

Use this spur as part of a measured tuning routine: verify pinion alignment, confirm backlash, and check for even tooth contact over the full rotation. Consistent meshing reduces variable loads on drivetrain bearings and helps maintain repeatable lap times.

What is the recommended procedure to set mesh with this spur?

Fit the pinion, apply a thin film of gear marking compound, rotate the gears to inspect contact, then set minimal but safe backlash and retest under load.

How does tooth count affect top speed and acceleration with this part?

Changing pinion size against this 71T spur alters overall ratio; larger pinions increase top speed at the expense of low end, smaller pinions improve acceleration. Make incremental changes and log results.

Are there common failure modes to monitor during races?

Monitor for chipped teeth, uneven wear, and excessive heat in the mesh area. Regular inspections between runs prevent unexpected gear failure.