Setups
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Gearing
Stock gearing for the Xpress Arrow AT1S, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 20T | 4.70 | 11.06 |
| 21T | 4.48 | 10.53 |
| 22T | 4.27 | 10.05 |
| 23T | 4.09 | 9.62 |
| 24T | 3.92 | 9.22 |
| 25T | 3.76 | 8.85 |
| 26T | 3.62 | 8.51 |
| 27T | 3.48 | 8.19 |
| 28T | 3.36 | 7.90 |
| 29T | 3.24 | 7.63 |
| 30T | 3.13 | 7.37 |
| 31T | 3.03 | 7.13 |
| 32T | 2.94 | 6.91 |
| 33T | 2.85 | 6.70 |
| 34T | 2.76 | 6.51 |
| 35T | 2.69 | 6.32 |
| 36T | 2.61 | 6.14 |
| 37T | 2.54 | 5.98 |
| 38T | 2.47 | 5.82 |
| 39T | 2.41 | 5.67 |
| 40T | 2.35 | 5.53 |
| 41T | 2.29 | 5.39 |
| 42T | 2.24 | 5.27 |
| 43T | 2.19 | 5.14 |
| 44T | 2.14 | 5.03 |
| 45T | 2.09 | 4.92 |
| 46T | 2.04 | 4.81 |
| 47T | 2.00 | 4.71 |
| 48T | 1.96 | 4.61 |
| 49T | 1.92 | 4.51 |
| 50T | 1.88 | 4.42 |
| 51T | 1.84 | 4.34 |
| 52T | 1.81 | 4.25 |
Shaded rows are the pinions most 1/10 4WD touring/gt setups run on the stock spur.
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Xpress Arrow AT1S, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Xpress Arrow AT1S?
It depends on your motor and the track. In the 1/10 4WD touring/gt class, racers gear by final drive ratio: 6T and below near 7.34, 13.5T near 4.51, 17.5T near 4.51, 21.5T and up near 3.65. On the Arrow AT1S's stock 94T spur that is about 30T for 6T and below, 49T for 13.5T, 49T for 17.5T, 61T for 21.5T and up. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the Arrow AT1S selected.
What is the internal ratio (transmission ratio) of the Xpress Arrow AT1S?
The Arrow AT1S has an internal ratio of 2.353:1. Final drive ratio = spur ÷ pinion × 2.353. With the stock 94T spur, a 20T pinion gives an FDR of 11.06 and a 52T gives 4.25.
How many teeth is the stock spur gear on the Xpress Arrow AT1S?
94 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
- 450 cst
- Rear
- 450 cst
- Front
- Pink hard #XP-10170 →
- Rear
- Pink hard #XP-10170 →
- Front
- 4-hole
- Rear
- 4-hole
- Rear
- 5,000 cst
What shock oil does the Xpress Arrow AT1S come with?
Out of the box the Arrow AT1S runs 450 cst front, 450 cst rear, on 4-hole front, 4-hole 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 Xpress Arrow AT1S come with?
The kit springs are Pink hard (#XP-10170) front, Pink hard (#XP-10170) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the Xpress Arrow AT1S come with?
The kit diff fluid is 5,000 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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