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Gearing
Stock gearing for the Traxxas Slash Modified, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 15T | 5.73 | 15.59 |
| 16T | 5.38 | 14.62 |
| 17T | 5.06 | 13.76 |
| 18T | 4.78 | 13.00 |
| 19T | 4.53 | 12.31 |
| 20T | 4.30 | 11.70 |
| 21T | 4.10 | 11.14 |
| 22T | 3.91 | 10.63 |
| 23T | 3.74 | 10.17 |
| 24T | 3.58 | 9.75 |
| 25T | 3.44 | 9.36 |
| 26T | 3.31 | 9.00 |
| 27T | 3.19 | 8.66 |
| 28T | 3.07 | 8.35 |
| 29T | 2.97 | 8.07 |
| 30T | 2.87 | 7.80 |
| 31T | 2.77 | 7.55 |
| 32T | 2.69 | 7.31 |
| 33T | 2.61 | 7.09 |
| 34T | 2.53 | 6.88 |
| 35T | 2.46 | 6.68 |
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Traxxas Slash Modified, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Traxxas Slash Modified?
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 Slash Modified 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 Traxxas Slash Modified?
The Slash Modified has an internal ratio of 2.72:1. Final drive ratio = spur ÷ pinion × 2.72. With the stock 86T spur, a 15T pinion gives an FDR of 15.59 and a 35T gives 6.68.
How many teeth is the stock spur gear on the Traxxas Slash Modified?
86 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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