Setups
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Gearing
Stock gearing for the Serpent SRX4 Gen3, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 16T | 5.38 | 13.06 |
| 17T | 5.06 | 12.29 |
| 18T | 4.78 | 11.61 |
| 19T | 4.53 | 10.99 |
| 20T | 4.30 | 10.44 |
| 21T | 4.10 | 9.95 |
| 22T | 3.91 | 9.50 |
| 23T | 3.74 | 9.08 |
| 24T | 3.58 | 8.70 |
| 25T | 3.44 | 8.36 |
| 26T | 3.31 | 8.03 |
| 27T | 3.19 | 7.74 |
| 28T | 3.07 | 7.46 |
Shaded rows are the pinions most 1/10 4WD buggy setups run on the stock spur.
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Serpent SRX4 Gen3, 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 SRX4 Gen3?
It depends on your motor and the track. In the 1/10 4WD buggy class, racers gear by final drive ratio: 6T and below near 10.66, 7.5–8.5T near 10.00, 13.5T near 7.95. On the SRX4 Gen3's stock 86T spur that is about 20T for 6T and below, 21T for 7.5–8.5T, 26T for 13.5T. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the SRX4 Gen3 selected.
What is the internal ratio (transmission ratio) of the Serpent SRX4 Gen3?
The SRX4 Gen3 has an internal ratio of 2.429:1. Final drive ratio = spur ÷ pinion × 2.429. With the stock 86T spur, a 16T pinion gives an FDR of 13.06 and a 28T gives 7.46.
How many teeth is the stock spur gear on the Serpent SRX4 Gen3?
86 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 Serpent SRX4 Gen3 come with?
The kit springs are 3.7 lb Green (#500229) front, Astro 2.1 lb Blue (#500357) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
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Setup App & Race Log
Your Serpent SRX4 Gen3 is in the RC Setup App
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