Setups
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Gearing
Stock gearing for the Rlaarlo AK-917, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 15T | 5.20 | 15.60 |
| 16T | 4.88 | 14.63 |
| 17T | 4.59 | 13.76 |
| 18T | 4.33 | 13.00 |
| 19T | 4.11 | 12.32 |
| 20T | 3.90 | 11.70 |
| 21T | 3.71 | 11.14 |
| 22T | 3.55 | 10.64 |
| 23T | 3.39 | 10.17 |
| 24T | 3.25 | 9.75 |
| 25T | 3.12 | 9.36 |
| 26T | 3.00 | 9.00 |
| 27T | 2.89 | 8.67 |
| 28T | 2.79 | 8.36 |
| 29T | 2.69 | 8.07 |
| 30T | 2.60 | 7.80 |
| 31T | 2.52 | 7.55 |
| 32T | 2.44 | 7.31 |
| 33T | 2.36 | 7.09 |
| 34T | 2.29 | 6.88 |
| 35T | 2.23 | 6.69 |
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Rlaarlo AK-917, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Rlaarlo AK-917?
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 AK-917 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 Rlaarlo AK-917?
The AK-917 has an internal ratio of 3:1. Final drive ratio = spur ÷ pinion × 3. With the stock 78T spur, a 15T pinion gives an FDR of 15.60 and a 35T gives 6.69.
How many teeth is the stock spur gear on the Rlaarlo AK-917?
78 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
Kit setup
Kit shock setup. Part numbers link to AMain.
What springs does the Rlaarlo AK-917 come with?
The kit springs are Kit (#R10003) front, Kit (#R10003) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
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