What's the stock 8 Rim Width Range (inches)?
 

I would like to install tires on the stock rims 275/35/18, but not sure if that would fit...???

Diameter Difference: 1.55% not bad.

SImon,

Probably too wide. However, try the search feature. This type of question has been asked several times. Narrow your search to the Tire and Wheel forum.

https://www.rx8club.com/search.php

Someone on the racing section AutoX's on 275's I think (stock rims).

8"
 

8"