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Gearing
Stock gearing for the Serpent SRX8e Gen4, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 3.83 | 12.98 |
| 13T | 3.54 | 11.98 |
| 14T | 3.29 | 11.12 |
| 15T | 3.07 | 10.38 |
| 16T | 2.88 | 9.73 |
| 17T | 2.71 | 9.16 |
| 18T | 2.56 | 8.65 |
| 19T | 2.42 | 8.20 |
Shaded rows are the pinions most 1/8 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 SRX8e Gen4, 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 SRX8e Gen4?
It depends on your motor and the track. In the 1/8 4WD buggy class, racers gear by final drive ratio: 1800–2300 Kv near 10.06. On the SRX8e Gen4's stock 46T spur that is about 15T for 1800–2300 Kv. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the SRX8e Gen4 selected.
What is the internal ratio (transmission ratio) of the Serpent SRX8e Gen4?
The SRX8e Gen4 has an internal ratio of 3.385:1. Final drive ratio = spur ÷ pinion × 3.385. With the stock 46T spur, a 12T pinion gives an FDR of 12.98 and a 19T gives 8.20.
How many teeth is the stock spur gear on the Serpent SRX8e Gen4?
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 (Manual). Part numbers link to AMain.
What springs does the Serpent SRX8e Gen4 come with?
The kit springs are 4.9lb Pink (#600856) front, 3.8lb Purple (#600865) 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 SRX8e Gen4 is in the RC Setup App
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