Tire Size Calculator Good Info
 

To second that.... ill add this:

http://www.1010tires.com/WheelOffsetCalculator.asp

These should be made stickies....

:prayer:

i've been using that Miata site's calculator for a looonng time... it's definitely a real good resource... especially when trying to convince a friend that 205-45-16's are not going to make his car sit lower than 215-40-16's :bigeek:

Me too. I heard about it like 3-4 years ago and have used it a number of times. SUPER useful tool.