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Flyin' Miata gearing calculator

Wondering what a change in tire size will do to your gearing? How about a change in the rear end ratio, or a 6-speed swap? Well, now you can find out.

Setup Result

Target speed: mph
Target rpm: rpm

Tire size
/ -

Transmission

Rear end

Stock rear end ratios for North America

1990-93 5-speed 4.30
1994-97 5-speed 4.10
1999-05 5-speed 4.30
1999-03 6-speed 3.909
2004-05 6-speed 4.10
2006-15- all trans 4.10
2016-? 2.866

Please note that the 3.308 rear ratio is includes for calculation purposes only, and is not currently available. We do not know at this time if the 2.866 will fit in the other housings.
  ratio
1st
2nd
3rd
4th
5th
6th

 
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