Setups
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Gearing
Stock gearing for the ARRMA Felony, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 3.83 | 11.25 |
| 13T | 3.54 | 10.39 |
| 14T | 3.29 | 9.64 |
| 15T | 3.07 | 9.00 |
| 16T | 2.88 | 8.44 |
| 17T | 2.71 | 7.94 |
| 18T | 2.56 | 7.50 |
| 19T | 2.42 | 7.11 |
| 20T | 2.30 | 6.75 |
| 21T | 2.19 | 6.43 |
| 22T | 2.09 | 6.14 |
| 23T | 2.00 | 5.87 |
| 24T | 1.92 | 5.63 |
What pinion should I run?
Tell us your motor and track and get a starting pinion for the ARRMA Felony, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the ARRMA Felony?
It depends on your motor and the track. A hotter motor (lower turns, higher KV) takes a smaller pinion; a tight track wants a lower gear than an open one. Start near the middle of the pinions the Felony shipped with, run a few minutes, and check motor temperature before going up a tooth. The So Dialed Pinion Recommender gives a starting pinion for your motor where we have class data.
What is the internal ratio (transmission ratio) of the ARRMA Felony?
The Felony has an internal ratio of 2.935:1. Final drive ratio = spur ÷ pinion × 2.935. With the stock 46T spur, a 12T pinion gives an FDR of 11.25 and a 24T gives 5.63.
How many teeth is the stock spur gear on the ARRMA Felony?
46 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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