Setups
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Gearing
Stock gearing for the XRAY XB8 '20-'22, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 4.00 | 13.16 |
| 13T | 3.69 | 12.15 |
| 14T | 3.43 | 11.28 |
| 15T | 3.20 | 10.53 |
| 16T | 3.00 | 9.87 |
| 17T | 2.82 | 9.29 |
| 18T | 2.67 | 8.77 |
| 19T | 2.53 | 8.31 |
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 XRAY XB8 '20-'22, 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 XB8 '20-'22?
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 XB8 '20-'22's stock 48T spur that is about 16T 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 XB8 '20-'22 selected.
What is the internal ratio (transmission ratio) of the XRAY XB8 '20-'22?
The XB8 '20-'22 has an internal ratio of 3.29:1. Final drive ratio = spur ÷ pinion × 3.29. With the stock 48T spur, a 12T pinion gives an FDR of 13.16 and a 19T gives 8.31.
How many teeth is the stock spur gear on the XRAY XB8 '20-'22?
48 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 (Pivot ball '20). Part numbers link to AMain.
- Front
- 550 cst
- Rear
- 600 cst
- Front
- 7,000 cst
- Center
- 7,000 cst
- Rear
- 3,000 cst
What shock oil does the XRAY XB8 '20-'22 come with?
Out of the box the XB8 '20-'22 runs 550 cst front, 600 cst rear (XRAY oil), on 6 x 1.3mm (#358033) front, 6 x 1.3mm (#358033) 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 XB8 '20-'22 come with?
The kit springs are Prog 69mm 4 dot C0.8-0.83 (#358316) front, Prog 85mm 3 dot C0.68-0.7 (#358335) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the XRAY XB8 '20-'22 come with?
The kit diff fluid is 7,000 cst front, 7,000 cst center, 3,000 cst rear. Thicker front adds steering on power; thicker center sends more drive rearward; thicker rear stabilizes the car under throttle.
Setup Help
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