Setups
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Gearing
Stock gearing for the HB D8 World Spec, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 4.00 | 13.23 |
| 13T | 3.69 | 12.21 |
| 14T | 3.43 | 11.34 |
| 15T | 3.20 | 10.59 |
| 16T | 3.00 | 9.92 |
| 17T | 2.82 | 9.34 |
| 18T | 2.67 | 8.82 |
| 19T | 2.53 | 8.36 |
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 HB D8 World Spec, 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 D8 World Spec?
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 D8 World Spec's stock 48T 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 D8 World Spec selected.
What is the internal ratio (transmission ratio) of the HB D8 World Spec?
The D8 World Spec has an internal ratio of 3.308:1. Final drive ratio = spur ÷ pinion × 3.308. With the stock 48T spur, a 12T pinion gives an FDR of 13.23 and a 19T gives 8.36.
How many teeth is the stock spur gear on the HB D8 World Spec?
48 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
- 45 wt
- Rear
- 40 wt
- Front
- 5 x 1.5mm
- Rear
- 5 x 1.6mm
- Front
- 7,000 cst
- Center
- 5,000 cst
- Rear
- 2,000 cst
What shock oil does the HB D8 World Spec come with?
Out of the box the D8 World Spec runs 45 wt front, 40 wt rear (Team Orion oil), on 5 x 1.5mm front, 5 x 1.6mm 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 D8 World Spec come with?
The kit springs are Yellow 73.8gF (#109809) front, Blue 61.6gF (#109814) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the HB D8 World Spec come with?
The kit diff fluid is 7,000 cst front, 5,000 cst center, 2,000 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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