Thanks...that's a good calculator.

"duckbill" <ltcauth13@nospam.cs.com> wrote in message
news:0535973351d47c9f3fcdea1dd3b51697@localhost.ta lkaboutautos.com...
> You have already received some good advice; The following may help you
> with
> your decision. Gear ratio's (tire and wheel size) directly effect your
> milage and acceleration. I personally try to keep the same overall gear
> ratio that the manufacture designed the car with. It's usually the best
> combination of milage and performance. Go to www.miata.net/garage click
> on wheels and tires, click on tire size calculator on right. Good Luck
>