Quote:
Originally posted by miskywhisky:
or theres always this handy tool from the faq

http://www.miata.net/garage/tirecalc.html

besides. Their never exact anyways. After time all tires shrink.
Hmmm. 265/70/17 instead of 265/65/17 makes your speedo read 60 when you're actually doing 62. Not even enough to worry about. Cool tool man! [ThumbsUp]