Setups
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Gearing
Stock gearing for the Atomic BZ5, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 15T | 3.53 | 5.97 |
| 16T | 3.31 | 5.60 |
| 17T | 3.12 | 5.27 |
| 18T | 2.94 | 4.98 |
| 19T | 2.79 | 4.71 |
| 20T | 2.65 | 4.48 |
| 21T | 2.52 | 4.27 |
| 22T | 2.41 | 4.07 |
| 23T | 2.30 | 3.89 |
Shaded rows are the pinions most 1/24-1/28 4WD gp setups run on the stock spur.
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Atomic BZ5, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Atomic BZ5?
It depends on your motor and the track. Racers in the 1/24-1/28 4WD gp class run a 17–21 tooth pinion in most setups, usually on a 53T spur for a final drive ratio near 4.71. Hotter motors (lower turns, higher KV) take a smaller pinion; tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the BZ5 selected.
What is the internal ratio (transmission ratio) of the Atomic BZ5?
The BZ5 has an internal ratio of 1.69:1. Final drive ratio = spur ÷ pinion × 1.69. With the stock 53T spur, a 15T pinion gives an FDR of 5.97 and a 23T gives 3.89.
How many teeth is the stock spur gear on the Atomic BZ5?
53 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
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