Ask Miles, our Setup AI that’s been trained on the RB7.5.
Setups
Gearing
Stock gearing for the Kyosho RB7.5, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 18T | 4.22 | 10.98 |
| 19T | 4.00 | 10.40 |
| 20T | 3.80 | 9.88 |
| 21T | 3.62 | 9.41 |
| 22T | 3.45 | 8.98 |
| 23T | 3.30 | 8.59 |
| 24T | 3.17 | 8.23 |
| 25T | 3.04 | 7.90 |
| 26T | 2.92 | 7.60 |
| 27T | 2.81 | 7.32 |
| 28T | 2.71 | 7.06 |
| 29T | 2.62 | 6.81 |
| 30T | 2.53 | 6.59 |
| 31T | 2.45 | 6.37 |
| 32T | 2.38 | 6.17 |
Shaded rows are the pinions most 1/10 2WD 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 Kyosho RB7.5, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Kyosho RB7.5?
It depends on your motor and the track. In the 1/10 2WD buggy class, racers gear by final drive ratio: 6T and below near 9.40, 7.5–8.5T near 9.22, 17.5T near 6.48. On the RB7.5's stock 76T spur that is about 21T for 6T and below, 21T for 7.5–8.5T, 30T for 17.5T. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the RB7.5 selected.
What is the internal ratio (transmission ratio) of the Kyosho RB7.5?
The RB7.5 has an internal ratio of 2.6:1. Final drive ratio = spur ÷ pinion × 2.6. With the stock 76T spur, a 18T pinion gives an FDR of 10.98 and a 32T gives 6.17.
How many teeth is the stock spur gear on the Kyosho RB7.5?
76 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
- 400 cst
- Rear
- 400 cst
- Front
- 3.6 #W5312-36 →
- Rear
- 2.15 #W5313-215 →
What shock oil does the Kyosho RB7.5 come with?
Out of the box the RB7.5 runs 400 cst front, 400 cst rear (Kyosho oil). 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 Kyosho RB7.5 come with?
The kit springs are 3.6 (#W5312-36) front, 2.15 (#W5313-215) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
Setup Help
All 1/10 Off-Road Cars →
RB7.5 questions
Free to start · iOS & Android
Setup App & Race Log
Your Kyosho RB7.5 is in the RC Setup App
Save every setup change you make to your Kyosho RB7.5, get AI tuning answers for that exact car, and log your races — at the track or back in the pits.
- Setup Tracking
- AI Mechanic answers
- Find & Share Setups
- Race Log
- Gear Ratio Calculator
- Free to use
