Setups
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Gearing
Stock gearing for the PR Racing B10R, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 18T | 4.50 | 11.79 |
| 19T | 4.26 | 11.17 |
| 20T | 4.05 | 10.61 |
| 21T | 3.86 | 10.11 |
| 22T | 3.68 | 9.65 |
| 23T | 3.52 | 9.23 |
| 24T | 3.38 | 8.84 |
| 25T | 3.24 | 8.49 |
| 26T | 3.12 | 8.16 |
| 27T | 3.00 | 7.86 |
| 28T | 2.89 | 7.58 |
| 29T | 2.79 | 7.32 |
| 30T | 2.70 | 7.07 |
| 31T | 2.61 | 6.85 |
| 32T | 2.53 | 6.63 |
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 PR Racing B10R, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the PR Racing B10R?
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 B10R's stock 81T spur that is about 23T for 6T and below, 23T for 7.5–8.5T, 33T 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 B10R selected.
What is the internal ratio (transmission ratio) of the PR Racing B10R?
The B10R has an internal ratio of 2.62:1. Final drive ratio = spur ÷ pinion × 2.62. With the stock 81T spur, a 18T pinion gives an FDR of 11.79 and a 32T gives 6.63.
How many teeth is the stock spur gear on the PR Racing B10R?
81 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 (Carpet). Part numbers link to AMain.
- Front
- 450 cst
- Rear
- 400 cst
- Front
- Green 4.20lb #02530016 →
- Rear
- Green 3.00lb #02530056 →
- Front
- 2 x 1.8mm #17430096 →
- Rear
- 2 x 1.8mm #17430096 →
What shock oil does the PR Racing B10R come with?
Out of the box the B10R runs 450 cst front, 400 cst rear, on 2 x 1.8mm (#17430096) front, 2 x 1.8mm (#17430096) 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 PR Racing B10R come with?
The kit springs are Green 4.20lb (#02530016) front, Green 3.00lb (#02530056) 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 PR Racing B10R is in the RC Setup App
Save every setup change you make to your PR Racing B10R, get AI tuning answers for that exact car, and log your races — at the track or back in the pits.
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