I ran across a pretty decent Tire Calculator and remember there have been some really cool ones posted before along with Visualizers. Just thought it might be easier for folks to try different ones from a single thread rather than searching for them so if you know of any good ones, let's post them up. :thumbup:
http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTireMath.jsp
Here's the one that I found. It compares the new tire size to the OEM size and includes the Speedo difference.
http://www.readylift.com/guides
This one does the same and was previously posted by eXcelon:
http://www.miata.net/garage/tirecalc.html
http://www.discounttiredirect.com/direct/brochure/info/tmpInfoTireMath.jsp
Here's the one that I found. It compares the new tire size to the OEM size and includes the Speedo difference.
http://www.readylift.com/guides
This one does the same and was previously posted by eXcelon:
http://www.miata.net/garage/tirecalc.html