The Mazda 6-Speed Manual (MX-5 NC, 2015) is a six-speed manual gearbox.
First gear is 3.82:1 and 6th is 0.79:1. Divide one by the other and the overall spread is 4.84:1. That is a wide spread: a short first to get the car moving and a tall top to bring cruise revs down.
6th is an overdrive at 0.79:1: the output shaft turns faster than the input shaft. 5th is direct drive at 1.00:1.
The biggest step is 1st to 2nd, where the ratio drops 41%. The smallest is 4th to 5th at 15%. A drop that size lands the engine well down the rev range after the change, so it pays to know where the torque lives.
The final drive lives in a separate diff, so the speed table shows three common ratios: 3.42, 3.73 and 4.10. With a 3.73 final drive and 225/45R17 tyres, 6th at 6,000 rpm works out at 243 km/h (151 mph), and first runs out at 50 km/h (31 mph). At 70 mph in 6th the engine turns about 2,780 rpm.
Nearly the same box as the Mazda 6-Speed Manual (MX-5 NC, 2006): 6th is 0.79 here and 0.83 there. That page is the one listed for search; this one stays for anyone after this exact version.
Ratios
| Gear | Ratio | Step |
|---|---|---|
| 1st | 3.82:1 | - |
| 2nd | 2.26:1 | 40.8% |
| 3rd | 1.64:1 | 27.4% |
| 4th | 1.18:1 | 28.0% |
| 5th | 1.00:1 | 15.3% |
| 6th | 0.79:1 | 21.0% |