Setups
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Gearing
Stock gearing for the HB D418, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 16T | 4.50 | 14.89 |
| 17T | 4.24 | 14.01 |
| 18T | 4.00 | 13.23 |
| 19T | 3.79 | 12.54 |
| 20T | 3.60 | 11.91 |
| 21T | 3.43 | 11.34 |
| 22T | 3.27 | 10.83 |
| 23T | 3.13 | 10.36 |
| 24T | 3.00 | 9.92 |
| 25T | 2.88 | 9.53 |
| 26T | 2.77 | 9.16 |
| 27T | 2.67 | 8.82 |
| 28T | 2.57 | 8.51 |
Shaded rows are the pinions most 1/10 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 HB D418, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the HB D418?
It depends on your motor and the track. In the 1/10 4WD buggy class, racers gear by final drive ratio: 6T and below near 10.66, 7.5–8.5T near 10.00, 13.5T near 7.95. On the D418's stock 72T spur that is about 22T for 6T and below, 24T for 7.5–8.5T, 30T 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 D418 selected.
What is the internal ratio (transmission ratio) of the HB D418?
The D418 has an internal ratio of 3.308:1. Final drive ratio = spur ÷ pinion × 3.308. With the stock 72T spur, a 16T pinion gives an FDR of 14.89 and a 28T gives 8.51.
How many teeth is the stock spur gear on the HB D418?
72 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
- 50 wt
- Rear
- 40 wt
- Front
- 7,000 cst
- Center
- 30,000 cst
- Rear
- 5,000 cst
What shock oil does the HB D418 come with?
Out of the box the D418 runs 50 wt front, 40 wt rear, on 2 x 1.6mm (#116261) front, 2 x 1.7mm (#116261) 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 HB D418 come with?
The kit springs are 38mm 60gF (#204383) front, 52mm 40gF (#204389) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the HB D418 come with?
The kit diff fluid is 7,000 cst front, 30,000 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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