Originally Posted by CivicSiRacer
It will not be off slightly - it will be off by alot. And I don't think you can fit a tire that wide on the stock rims. The car will feel mushy with sidewalls bulging out.
Sorry if I was incorrect. I looked at the tire calculator at
http://www.miata.net/garage/tirecalc.html
According to that site, "Speedometer reading with non-stock tire is 4.5% to slow. When your speedo reads 60mph, you are actually traveling 62.7 mph."
If that site is correct, I consider that to be a slight difference.
As far as it fitting on a stock wheel, I don't know. I know that 5th gen. coupes (with the same stock wheel) come with 185/60/14 tires. I didn't think it would be that much bigger to go to the 195's.
You deffinately know you shit about tires/wheels/suspension much more that I do. Sorry if I was wrong.