Setups
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Gearing
Stock gearing for the RTRC RTA v1.2/2, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 4T | 13.25 | 13.25 |
| 5T | 10.60 | 10.60 |
| 6T | 8.83 | 8.83 |
| 7T | 7.57 | 7.57 |
| 8T | 6.63 | 6.63 |
| 9T | 5.89 | 5.89 |
| 10T | 5.30 | 5.30 |
| 11T | 4.82 | 4.82 |
| 12T | 4.42 | 4.42 |
| 13T | 4.08 | 4.08 |
| 14T | 3.79 | 3.79 |
| 15T | 3.53 | 3.53 |
| 16T | 3.31 | 3.31 |
Shaded rows are the pinions most 1/24-1/28 2WD touring/gt setups run on the stock spur.
What pinion should I run?
Tell us your motor and track and get a starting pinion for the RTRC RTA v1.2/2, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the RTRC RTA v1.2/2?
It depends on your motor and the track. Racers in the 1/24-1/28 2WD touring/gt class run a 6–14 tooth pinion in most setups, usually on a 53T spur for a final drive ratio near 5.30. 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 RTA v1.2/2 selected.
What is the internal ratio (transmission ratio) of the RTRC RTA v1.2/2?
The RTA v1.2/2 has an internal ratio of 1:1. Final drive ratio = spur ÷ pinion × 1. With the stock 53T spur, a 4T pinion gives an FDR of 13.25 and a 16T gives 3.31.
How many teeth is the stock spur gear on the RTRC RTA v1.2/2?
53 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
Setup Help
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