Ask Miles, our Setup AI that’s been trained on the MRV.
Setups
Gearing
Stock gearing for the Atomic MRV, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 6T | 8.67 | 8.67 |
| 7T | 7.43 | 7.43 |
| 8T | 6.50 | 6.50 |
| 9T | 5.78 | 5.78 |
| 10T | 5.20 | 5.20 |
| 11T | 4.73 | 4.73 |
| 12T | 4.33 | 4.33 |
| 13T | 4.00 | 4.00 |
| 14T | 3.71 | 3.71 |
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Atomic MRV, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Atomic MRV?
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 MRV 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 Atomic MRV?
The MRV has an internal ratio of 1:1. Final drive ratio = spur ÷ pinion × 1. With the stock 52T spur, a 6T pinion gives an FDR of 8.67 and a 14T gives 3.71.
How many teeth is the stock spur gear on the Atomic MRV?
52 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
Setup Help
All Small-scale On-road Cars →
Free to start · iOS & Android
Setup App & Race Log
Your Atomic MRV is in the RC Setup App
Save every setup change you make to your Atomic MRV, 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
