Setups
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Gearing
Stock gearing for the Team Losi JRX-Pro, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 18T | 4.78 | 10.42 |
| 19T | 4.53 | 9.87 |
| 20T | 4.30 | 9.37 |
| 21T | 4.10 | 8.93 |
| 22T | 3.91 | 8.52 |
| 23T | 3.74 | 8.15 |
| 24T | 3.58 | 7.81 |
| 25T | 3.44 | 7.50 |
| 26T | 3.31 | 7.21 |
| 27T | 3.19 | 6.94 |
| 28T | 3.07 | 6.70 |
| 29T | 2.97 | 6.46 |
| 30T | 2.87 | 6.25 |
| 31T | 2.77 | 6.05 |
| 32T | 2.69 | 5.86 |
Shaded rows are the pinions most 1/10 2WD 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 Team Losi JRX-Pro, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Team Losi JRX-Pro?
It depends on your motor and the track. In the 1/10 2WD buggy class, racers gear by final drive ratio: 6T and below near 9.40, 7.5–8.5T near 9.22, 17.5T near 6.48. On the JRX-Pro's stock 86T spur that is about 20T for 6T and below, 20T for 7.5–8.5T, 29T for 17.5T. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the JRX-Pro selected.
What is the internal ratio (transmission ratio) of the Team Losi JRX-Pro?
The JRX-Pro has an internal ratio of 2.18:1. Final drive ratio = spur ÷ pinion × 2.18. With the stock 86T spur, a 18T pinion gives an FDR of 10.42 and a 32T gives 5.86.
How many teeth is the stock spur gear on the Team Losi JRX-Pro?
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 Team Losi JRX-Pro come with?
The kit springs are Long Soft (#5105) front, Long Firm (#5107) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
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