Setups
Have a setup for the Infraction?
Share your setup sheet with the community — we'll fill in the details automatically.
Gearing
Stock gearing for the ARRMA Infraction, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 3.83 | 10.73 |
| 13T | 3.54 | 9.91 |
| 14T | 3.29 | 9.20 |
| 15T | 3.07 | 8.59 |
| 16T | 2.88 | 8.05 |
| 17T | 2.71 | 7.58 |
| 18T | 2.56 | 7.16 |
| 19T | 2.42 | 6.78 |
| 20T | 2.30 | 6.44 |
| 21T | 2.19 | 6.13 |
| 22T | 2.09 | 5.85 |
| 23T | 2.00 | 5.60 |
| 24T | 1.92 | 5.37 |
What pinion should I run?
Tell us your motor and track and get a starting pinion for the ARRMA Infraction, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the ARRMA Infraction?
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 Infraction 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 ARRMA Infraction?
The Infraction has an internal ratio of 2.8:1. Final drive ratio = spur ÷ pinion × 2.8. With the stock 46T spur, a 12T pinion gives an FDR of 10.73 and a 24T gives 5.37.
How many teeth is the stock spur gear on the ARRMA Infraction?
46 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
- 2000 cst
- Rear
- 2000 cst
- Front
- 6x1.2mm
- Rear
- 6x1.2mm
- Front
- 10,000 cst
- Center
- 100,000 cst
- Rear
- 10,000 cst
What shock oil does the ARRMA Infraction come with?
Out of the box the Infraction runs 2000 cst front, 2000 cst rear, on 6x1.2mm front, 6x1.2mm 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 ARRMA Infraction come with?
The kit springs are 35mm 4.7N (#330600) front, 40mm 6.6N (#330599) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the ARRMA Infraction come with?
The kit diff fluid is 10,000 cst front, 100,000 cst center, 10,000 cst rear. Thicker front adds steering on power; thicker center sends more drive rearward; thicker rear stabilizes the car under throttle.
Setup Help
All Bashers →
Free to start · iOS & Android
Setup App & Race Log
Your ARRMA Infraction is in the RC Setup App
Save every setup change you make to your ARRMA Infraction, get AI tuning answers for that exact car, and log your races — at the track or back in the pits.
- Setup Tracking
- AI Mechanic answers
- Find & Share Setups
- Race Log
- Gear Ratio Calculator
- Free to use
