Setups
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Gearing
Stock gearing for the ARRMA Kraton 4X4 BLX/EXB 1/8, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 4.17 | 17.92 |
| 13T | 3.85 | 16.54 |
| 14T | 3.57 | 15.36 |
| 15T | 3.33 | 14.33 |
| 16T | 3.13 | 13.44 |
| 17T | 2.94 | 12.65 |
| 18T | 2.78 | 11.94 |
Shaded rows are the pinions most 1/8 4WD truck setups run on the stock spur.
What pinion should I run?
Tell us your motor and track and get a starting pinion for the ARRMA Kraton 4X4 BLX/EXB 1/8, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the ARRMA Kraton 4X4 BLX/EXB 1/8?
It depends on your motor and the track. In the 1/8 4WD truck class, racers gear by final drive ratio: 1800–2300 kV near 13.97. On the Kraton 4X4 BLX/EXB 1/8's stock 50T spur that is about 15T 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 Kraton 4X4 BLX/EXB 1/8 selected.
What is the internal ratio (transmission ratio) of the ARRMA Kraton 4X4 BLX/EXB 1/8?
The Kraton 4X4 BLX/EXB 1/8 has an internal ratio of 4.3:1. Final drive ratio = spur ÷ pinion × 4.3. With the stock 50T spur, a 12T pinion gives an FDR of 17.92 and a 18T gives 11.94.
How many teeth is the stock spur gear on the ARRMA Kraton 4X4 BLX/EXB 1/8?
50 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
- 1000 cst
- Rear
- 1000 cst
- Front
- 10,000 cst
- Center
- 100,000 cst
- Rear
- 10,000 cst
What shock oil does the ARRMA Kraton 4X4 BLX/EXB 1/8 come with?
Out of the box the Kraton 4X4 BLX/EXB 1/8 runs 1000 cst front, 1000 cst rear, on Kit (#330339) front, Kit (#330339) 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 ARRMA Kraton 4X4 BLX/EXB 1/8 come with?
The kit springs are 85mm 6.2lb (#330507) front, 95mm 5lb (#330508) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the ARRMA Kraton 4X4 BLX/EXB 1/8 come with?
The kit diff fluid is 10,000 cst front, 100,000 cst center, 10,000 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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