Setups
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Gearing
Stock gearing for the Serpent Viper 990e R, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 11T | 4.18 | 10.04 |
| 12T | 3.83 | 9.20 |
| 13T | 3.54 | 8.49 |
| 14T | 3.29 | 7.89 |
| 15T | 3.07 | 7.36 |
| 16T | 2.88 | 6.90 |
| 17T | 2.71 | 6.49 |
| 18T | 2.56 | 6.13 |
| 19T | 2.42 | 5.81 |
| 20T | 2.30 | 5.52 |
| 21T | 2.19 | 5.26 |
| 22T | 2.09 | 5.02 |
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Serpent Viper 990e R, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Serpent Viper 990e R?
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 Viper 990e R 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 Serpent Viper 990e R?
The Viper 990e R has an internal ratio of 2.4:1. Final drive ratio = spur ÷ pinion × 2.4. With the stock 46T spur, a 11T pinion gives an FDR of 10.04 and a 22T gives 5.02.
How many teeth is the stock spur gear on the Serpent Viper 990e R?
46 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.
- Front
- 900 cst
- Rear
- 900 cst
What shock oil does the Serpent Viper 990e R come with?
Out of the box the Viper 990e R runs 900 cst front, 900 cst rear (Serpent oil), on 2 hole (#160134) front, 2 hole (#160134) rear pistons. That is the kit setup; you will need to adjust it for your track conditions. The RC Setup App can help dial it in.
What springs does the Serpent Viper 990e R come with?
The kit springs are 21mm 7.5/42.6 Silver (#160311) front, 4.9/28 Pink (#160324) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
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