Hello, gentlemen.

I have a 2008 G35xS with the 225/50-18 OEMs, the size in which there seem to be very few options. Could I run 235/45-18s instead without any pronounced adverse effects?

 

I got the same wheels/tires as you, when my OEMs wear out I am going to go 245/45 18, this will match the OEM outer diameter better than 235/45 18, which you can run but speedo will be off a little more than the 245/45s, plus you get 10 whole more mm of tire width, lol. If you want to find out more detail just check out this site:

http://www.miata.net/garage/tirecalc.html

Gluck

 

Hi, and welcome to the forum. I'm closing this thread because there are a TON of tire threads - please search in the Tech sub-forum, and you'll find your answer.