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mrimorton
08-28-2002, 01:31 PM
On factory 73RSs, why were the front tyres 70 series and the rear tyres were 60 series?
Unlike on S models, the tyres were 70 series all round.

Thanks in advance.
p.s. Did Michelin ever make XWXs in 60 series?

pwd72s
08-28-2002, 02:41 PM
Here's a place to play with tire sizes, and your answer may be here as well. But I think you'll find that the wider 60 series tires actually had a diameter close to the 70 series up front...
www.miata.net/garage/tirecalc.html (http://www.miata.net/garage/tirecalc.html)

mrimorton
08-28-2002, 05:24 PM
pwd, thanks for this. You are right, the 215/60 has the same diameter as the 185/70.

If only I could find OEM's.........