Setups
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Gearing
Stock gearing for the Kyosho Turbo Optima, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 16T | 2.56 | 7.76 |
| 17T | 2.41 | 7.31 |
| 18T | 2.28 | 6.90 |
| 19T | 2.16 | 6.54 |
| 20T | 2.05 | 6.21 |
| 21T | 1.95 | 5.92 |
| 22T | 1.86 | 5.65 |
| 23T | 1.78 | 5.40 |
| 24T | 1.71 | 5.18 |
| 25T | 1.64 | 4.97 |
| 26T | 1.58 | 4.78 |
| 27T | 1.52 | 4.60 |
| 28T | 1.46 | 4.44 |
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 Kyosho Turbo Optima, 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 Turbo Optima?
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 Turbo Optima's stock 41T spur that is about 12T for 6T and below, 12T for 7.5–8.5T, 16T 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 Turbo Optima selected.
What is the internal ratio (transmission ratio) of the Kyosho Turbo Optima?
The Turbo Optima has an internal ratio of 3.03:1. Final drive ratio = spur ÷ pinion × 3.03. With the stock 41T spur, a 16T pinion gives an FDR of 7.76 and a 28T gives 4.44.
How many teeth is the stock spur gear on the Kyosho Turbo Optima?
41 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
Setup Help
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