Advice on tires
The closest to the factory 225/45/18 is 245/30/20 (http://www.miata.net/garage/tirecalc.html). But as has been mentioned...PLEASE don't put 20's on an RX-8.
Just be careful. You have to realize there is a bad downside to bigger rims. I have 19" on my car right now, & the ride is a good bit stiffer. with 20" I bet the tire looks like rubber bands & the ride will be ridiculous.
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