I tend to agree with dom on this one. 50 profile tyres on 17's are too big. Besides that will really throw your rolling diameter out. According to the online calculator http://www.miata.net/garage/tirecalc.html when I went from my 195/60/15 to 17's the closest and best match is 205/45/17, but I opted for the 215/45 as Iwould have slightly more sidewall for a more family orientated ride - well as much as I want!Originally Posted by Dominik
Speedo will be out by 1.7%
If I went for 205/50 I would have been out by 3.5% and the 215/50 would be out by 5.2%. Way too far!
But damn those high performance tyres are noisy!
Raz
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