> Can I stuff 15x8.5's wrapped with 275-50-15's under my 99 'Vert without
> mods? How would this affect my speedometer vs my 205/60/15's?
The 275/50/15 will certainly fit. I had 275/35/18 on 9.5" under all 4
corners of my '00 GT 'vert.
http://www.miata.net/garage/tirecalc.html
Here is a calculator to play with, it'll save you from doing the math, when
comparing sizes.

Signature
John C.
'03 Cobra Convt.
Carl - 28 Dec 2005 20:18 GMT
Found out the wheels have the wrong bolt pattern. Found a good deal on some
nice 16's today. What size tire should I go with? I'd like year-round
performance, mild driving. I like the look of a wider tire, but I want to
keep my speedomete accurate.
Carl
>> Can I stuff 15x8.5's wrapped with 275-50-15's under my 99 'Vert without
>> mods? How would this affect my speedometer vs my 205/60/15's?
[quoted text clipped - 7 lines]
> when
> comparing sizes.