Setups
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Gearing
Stock gearing for the XRAY XB2D '21, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 18T | 4.33 | 11.48 |
| 19T | 4.11 | 10.88 |
| 20T | 3.90 | 10.33 |
| 21T | 3.71 | 9.84 |
| 22T | 3.55 | 9.40 |
| 23T | 3.39 | 8.99 |
| 24T | 3.25 | 8.61 |
| 25T | 3.12 | 8.27 |
| 26T | 3.00 | 7.95 |
| 27T | 2.89 | 7.66 |
| 28T | 2.79 | 7.38 |
| 29T | 2.69 | 7.13 |
| 30T | 2.60 | 6.89 |
| 31T | 2.52 | 6.67 |
| 32T | 2.44 | 6.46 |
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 XRAY XB2D '21, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the XRAY XB2D '21?
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 XB2D '21's stock 78T spur that is about 22T for 6T and below, 22T for 7.5–8.5T, 32T 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 XB2D '21 selected.
What is the internal ratio (transmission ratio) of the XRAY XB2D '21?
The XB2D '21 has an internal ratio of 2.65:1. Final drive ratio = spur ÷ pinion × 2.65. With the stock 78T spur, a 18T pinion gives an FDR of 11.48 and a 32T gives 6.46.
How many teeth is the stock spur gear on the XRAY XB2D '21?
78 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
- 500 cst
- Rear
- 500 cst
What shock oil does the XRAY XB2D '21 come with?
Out of the box the XB2D '21 runs 500 cst front, 500 cst rear (XRAY oil), on 2 x 1.6mm (#368031) front, 2 x 1.7mm (#368031) 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 XRAY XB2D '21 come with?
The kit springs are 45mm Linear 1 dot (#368183) front, 60mm Linear 1 dot (#368284) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
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