Stock Wheel Size S2 ?
 

Just after the figures on the stock wheel for an 82.

Currently I got on 205/40/ZR17 80W

I'm after the stock figures so I can plug the details in here:
http://www.miata.net/garage/tirecalc.html

and work out the implications...

Cheerio,

Paul.

Boy, that's nifty. Wish I knew :D

stock steel wheel - 13"x5" ; tire size - 165HR 13
stock aluminum wheel - 13"x5 1/2" ; tire size 185/ 70-13

Ouch 13" hmm, Thanks for that data there!

Hoping to get away with the 17s for a roadworthy check..

Cheers,

Paul.