Setups
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Gearing
Stock gearing for the WIRC SBX-2, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 3.83 | 13.57 |
| 13T | 3.54 | 12.53 |
| 14T | 3.29 | 11.63 |
| 15T | 3.07 | 10.86 |
| 16T | 2.88 | 10.18 |
| 17T | 2.71 | 9.58 |
| 18T | 2.56 | 9.05 |
| 19T | 2.42 | 8.57 |
Shaded rows are the pinions most 1/8 4WD 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 WIRC SBX-2, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the WIRC SBX-2?
It depends on your motor and the track. In the 1/8 4WD buggy class, racers gear by final drive ratio: 1800–2300 kV near 10.06. On the SBX-2's stock 46T spur that is about 16T for 1800–2300 kV. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the SBX-2 selected.
What is the internal ratio (transmission ratio) of the WIRC SBX-2?
The SBX-2 has an internal ratio of 3.54:1. Final drive ratio = spur ÷ pinion × 3.54. With the stock 46T spur, a 12T pinion gives an FDR of 13.57 and a 19T gives 8.57.
How many teeth is the stock spur gear on the WIRC SBX-2?
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
- 600 cst
- Rear
- 600 cst
- Front
- 8 x 1.2mm tapered
- Rear
- 8 x 1.3mm
- Front
- 5,000 cst
- Center
- 5,000 cst
- Rear
- 5,000 cst
What shock oil does the WIRC SBX-2 come with?
Out of the box the SBX-2 runs 600 cst front, 600 cst rear (P-ONE oil), on 8 x 1.2mm tapered front, 8 x 1.3mm 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 WIRC SBX-2 come with?
The kit springs are Medium black (#100125) front, Medium black (#100126) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the WIRC SBX-2 come with?
The kit diff fluid is 5,000 cst front, 5,000 cst center, 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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Setup App & Race Log
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