Ask Miles, our Setup AI that’s been trained on the RMX 2.5/2.5 S.
Setups
RC Jargon
Current Setup
- Track
- Armstrong VCT· Indoor P-Tile · Low/Medium grip
- Date
- Nov 10, 2026
DStahl
My Base Setup
- Track
- P-Steazy’s Playhouse· Indoor Concrete · Low/Medium grip
- Date
- Nov 10, 2026
Devon
Twisted Lanes 10/3/2026
- Track
- Twisted Lanes· Indoor Concrete · Low grip
- Date
- Oct 10, 2026
Ranutherider
My Base Setup
- Track
- Dream Rides· Indoor Asphalt · Low grip
- Date
- Aug 29, 2026
Devon
Casa Drift 7/26
- Track
- Twisted Lanes· Indoor Concrete · Low grip
- Date
- Jul 28, 2026
Carbon BlueZZ
Scale Science Base Setup
- Track
- Scale Science· Indoor Concrete · Low grip
- Event
- Open Practice· Jul 25, 2026
Devon
Twisted Lanes Setup (Low grip) 7/15/26
- Track
- Twisted Lanes· Indoor Concrete · Low grip
- Date
- Jul 22, 2026
OneTenFlicks
SDC WI Regional Winner - BINGO RMX 2.5
- Track
- Casa Drift· Indoor P-Tile · Medium grip
- Date
- Nov 14, 2025
Nicklas Lindgren
250824
- Track
- Out On The Street· Outdoor Asphalt · Low grip
- Date
- Aug 24, 2025
Gearing
Stock gearing for the MST RMX 2.5/2.5 S, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 17T | 4.71 | 14.12 |
| 18T | 4.44 | 13.33 |
| 19T | 4.21 | 12.63 |
| 20T | 4.00 | 12.00 |
| 21T | 3.81 | 11.43 |
| 22T | 3.64 | 10.91 |
| 23T | 3.48 | 10.43 |
| 24T | 3.33 | 10.00 |
| 25T | 3.20 | 9.60 |
| 26T | 3.08 | 9.23 |
| 27T | 2.96 | 8.89 |
| 28T | 2.86 | 8.57 |
Shaded rows are the pinions most 1/10 2WD 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 MST RMX 2.5/2.5 S, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain → (opens in new tab)What pinion gear should I use on the MST RMX 2.5/2.5 S?
It depends on your motor and the track. In the 1/10 2WD touring/gt class, racers gear by final drive ratio: 13.5T near 9.80. On the RMX 2.5/2.5 S's stock 80T spur that is about 24T for 13.5T. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the RMX 2.5/2.5 S selected.
What is the internal ratio (transmission ratio) of the MST RMX 2.5/2.5 S?
The RMX 2.5/2.5 S has an internal ratio of 3:1. Final drive ratio = spur ÷ pinion × 3. With the stock 80T spur, a 17T pinion gives an FDR of 14.12 and a 28T gives 8.57.
How many teeth is the stock spur gear on the MST RMX 2.5/2.5 S?
80 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
- 20 wt
- Rear
- 20 wt
- Front
- Gold #820103-3 →
- Rear
- Purple-red #820104-3 →
- Front
- 3 x 1.2mm
- Rear
- 3 x 1.2mm
What shock oil does the MST RMX 2.5/2.5 S come with?
Out of the box the RMX 2.5/2.5 S runs 20 wt front, 20 wt rear, on 3 x 1.2mm front, 3 x 1.2mm 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 MST RMX 2.5/2.5 S come with?
The kit springs are Gold (#820103-3) front, Purple-red (#820104-3) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
All Drift Cars →
RMX 2.5/2.5 S questions
How do I fix steering full lock when turning left on an MST RMX 2.5 S?
If the wheels turn farther left than right, first check the steering linkage for binding, then adjust the radio’s steering endpoint/EPA for the right turn. Increase the right-side...
Oct 24, 2026
General setup for MST RMX 2.5/2.5 S?
For a general starting point, keep the RMX 2.5/2.5 S close to its kit setup, then tune it for your surface and tires. Assuming a typical drift track, start with the kit alignment...
Oct 15, 2026
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