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Message: <blockquote data-quote="Crymson" data-source="post: 10778" data-attributes="member: 111"><p>I have a question and I hope to get some answers from those who know.  Most people using 17 rims would be using 215/45/17 or 225/45/17 tyres as the recommended maximum difference in diameters should be +-2.5% from standard 15'. Using <a href="http://www.miata.net/garage/tirecalc.html" target="_blank">www.miata.net/garage/tirecalc.html</a>, you can see that using the 215/45/17 would have a speedo reading with non-stock tire at -0.3%, ie speedo would read 60 mph but actually travelling at 59.8 mph. Using 225/45/17 would have a speedo reading with non-stock tire at 1.2%, ie speedo would read 60 mph but actually travelling at 60.7 mph. But I would like to know if anyone is using 215/50/17. and what are your opinion & conclusion in using this size? The tyre size calculator would read a 3.2%, which is above the +-2.5% rule. Meaning, when your speedo says you are travelling at 60 mph, you area actually travelling at 61.9 mph.  Just toying with the idea of getting thicker tyre size. Low profiles are constantly being damage by our bad road conditions daily.</p></blockquote><p></p>