Setups
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Gearing
Stock gearing for the XRAY X8 '24-'25, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 11T | 5.45 | 5.45 |
| 12T | 5.00 | 5.00 |
| 13T | 4.62 | 4.62 |
| 14T | 4.29 | 4.29 |
| 15T | 4.00 | 4.00 |
| 16T | 3.75 | 3.75 |
| 17T | 3.53 | 3.53 |
| 18T | 3.33 | 3.33 |
| 19T | 3.16 | 3.16 |
| 20T | 3.00 | 3.00 |
| 21T | 2.86 | 2.86 |
| 22T | 2.73 | 2.73 |
What pinion should I run?
Tell us your motor and track and get a starting pinion for the XRAY X8 '24-'25, 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 X8 '24-'25?
It depends on your motor and the track. A hotter motor (lower turns, higher KV) takes a smaller pinion; a tight track wants a lower gear than an open one. Start near the middle of the pinions the X8 '24-'25 shipped with, run a few minutes, and check motor temperature before going up a tooth. The So Dialed Pinion Recommender gives a starting pinion for your motor where we have class data.
What is the internal ratio (transmission ratio) of the XRAY X8 '24-'25?
The X8 '24-'25 has an internal ratio of 1:1. Final drive ratio = spur ÷ pinion × 1. With the stock 60T spur, a 11T pinion gives an FDR of 5.45 and a 22T gives 2.73.
How many teeth is the stock spur gear on the XRAY X8 '24-'25?
60 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
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