Quote:
Originally Posted by FR-S Matt
I'd probably go with 225's and a sportier tire than stock. If I can fit a 245 on 9.5 with really good fitment, I think 225 on 17X8 will fit nicely. Test a bit with the tire tools that are stickied and the tire calc that miata.net has. That's how I decided on 245/35/18 for my wheels as they don't rub and my speedometer is accurate.
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I've been using that tool on miata.net and the closest I've come to keeping it accurate was the 235/40. The 225/45 was about 1.4% off on the speedometer rating while the 235 was only .9%.
I have seen that the kumho xs have a a tread with of 7.9 in on their 215's so I'm almost thinking that may be the way to go as well.