Firstly I apologize if you already know of this site but I have found it invaluablefor calculating tire clearance. Plus it tells you factory size calculations for a comparison with the new tire choice and ground clearance/speedo adjustment. Well worth a visit. :-)
www.net-comber.com/tirecalc.html
92 Blazer LTTahoe 4.3 (w)

 

That site is pretty nifty! I had like 3 different sites that would give me all that, but now I've got one that does it all in one place[8D].

Woo!

 

Meh... I like the one I use better. Miata.net - Tire Size Calculator

 

I tried Miata .netbut couldnt view coz I ain't got java :-(

 

Haha..I dunno..Miata.net only shows a pic, I like the colors on the first one..lol

 

No Java???

You could use the older one that isn't java - Miata.net - Tire Size Calculator - old

The colors annoy me... To each his own.

 

The only feature I like that miata doesn't have is the " Also, the ground clearance of the vehicle will change by x.xxx inches."

EDIT: I also like miata better because it gives you a visual representation of the old tire versus new, from the end and the side.

 

I Like the Maita one.. aswell.... ~

 

there both good

to bad i dont know how to use either

 

The miata.net calculator is all over the net, seen it on a half dozen sites. Good program.

Thanks for posting the net-comber one, it's got some features I like.