Setups
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Gearing
Stock gearing for the Willspeed Fast Fox B7 Conversion, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 18T | 4.33 | 11.27 |
| 19T | 4.11 | 10.67 |
| 20T | 3.90 | 10.14 |
| 21T | 3.71 | 9.66 |
| 22T | 3.55 | 9.22 |
| 23T | 3.39 | 8.82 |
| 24T | 3.25 | 8.45 |
| 25T | 3.12 | 8.11 |
| 26T | 3.00 | 7.80 |
| 27T | 2.89 | 7.51 |
| 28T | 2.79 | 7.24 |
| 29T | 2.69 | 6.99 |
| 30T | 2.60 | 6.76 |
| 31T | 2.52 | 6.54 |
| 32T | 2.44 | 6.34 |
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 Willspeed Fast Fox B7 Conversion, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Willspeed Fast Fox B7 Conversion?
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 Fast Fox B7 Conversion's stock 78T spur that is about 22T for 6T and below, 22T for 7.5–8.5T, 31T 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 Fast Fox B7 Conversion selected.
What is the internal ratio (transmission ratio) of the Willspeed Fast Fox B7 Conversion?
The Fast Fox B7 Conversion has an internal ratio of 2.6:1. Final drive ratio = spur ÷ pinion × 2.6. With the stock 78T spur, a 18T pinion gives an FDR of 11.27 and a 32T gives 6.34.
How many teeth is the stock spur gear on the Willspeed Fast Fox B7 Conversion?
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 (Med-high Grip Carpet). Part numbers link to AMain.
- Front
- 450 cst
- Rear
- 450 cst
What shock oil does the Willspeed Fast Fox B7 Conversion come with?
Out of the box the Fast Fox B7 Conversion runs 450 cst front, 450 cst rear (Team Associated oil), on 2.5mm 2x1.7mm holes (#91933) front, 2.5mm 2x1.8mm holes (#91934) 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 Willspeed Fast Fox B7 Conversion come with?
The kit springs are 4.8lb Green (#W2004) front, 2.25lb Green (#W2009) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
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