Setups
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Gearing
Stock gearing for the XRAY XT2 '21, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 16T | 4.88 | 12.92 |
| 17T | 4.59 | 12.16 |
| 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 |
Shaded rows are the pinions most 1/10 2WD truck 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 XT2 '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 XT2 '21?
It depends on your motor and the track. In the 1/10 2WD truck class, racers gear by final drive ratio: 7.5–8.5T near 10.14, 13.5T near 8.27. On the XT2 '21's stock 78T spur that is about 20T for 7.5–8.5T, 25T 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 XT2 '21 selected.
What is the internal ratio (transmission ratio) of the XRAY XT2 '21?
The XT2 '21 has an internal ratio of 2.65:1. Final drive ratio = spur ÷ pinion × 2.65. With the stock 78T spur, a 16T pinion gives an FDR of 12.92 and a 30T gives 6.89.
How many teeth is the stock spur gear on the XRAY XT2 '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 (Dirt). Part numbers link to AMain.
- Front
- 650 cst
- Rear
- 500 cst
What shock oil does the XRAY XT2 '21 come with?
Out of the box the XT2 '21 runs 650 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 XT2 '21 come with?
The kit springs are 45mm Linear 4 dot (#368186) front, 60mm Linear 3 dot (#368286) 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 XRAY XT2 '21 is in the RC Setup App
Save every setup change you make to your XRAY XT2 '21, get AI tuning answers for that exact car, and log your races — at the track or back in the pits.
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