Wheels

As said in description I am a bit confused as to what size wheels I should have on my car I would like to put a set of originals back on as I’m sure the 16"s will affect the drive 

Please can someone shed some light on this for me I’m willing to swap my wheels for an original set they are 16" CSA alloys

 

These are the standard 15" wheels that suit the car fine, they did put 14" on and later cars had 16" on some models.

A gallery of most of the factory wheels fitted:
https://www.miata.net/faq/wheel_weights.html

Does not include the non-factory wheels fitted by Mazda UK.