15" vs 20" tire pic
 

Had the tires off and snapped this pic in case anyone was interested.

Left: 245/40/20
center: 235/75/15
right: 295/40/20

Nice, never thought a 20 would be shorter than a 15!

Brad, do you still have the tires handy? If so, can you measure the total height of each of the three tires. That's a great pic, and valuable information when tire hunting! Width of each would be handy also.
Thanks, Greg.

Whats the rim width on the 20's ?:D

I'd say 8" on one, and 10" on the other...

Ya Think !!! ;)

yEP.....remember my post about my 16's to 20's They were almost identical...about 1/8th of an inch taller on the 20's. And they 16's had 50 series tires.

If you want to see a visual of the fifference a tire size is, follow this link...
http://www.miata.net/garage/tirecalc.html

Cool site!

Yep and 8 and 10" wheels. Cool link N2trux. Guess I don't need to measure those tires now.

Always remember that the numbers on the sidewall are "advertised" size, and will not all be the same.

What that means is if you take three 275/50/15 made by three different companies, they may all be different sizes.

Heres a comparison between 20's and 24's. Sorry for the HUGE pic...

http://www.rozziwheels.com/newsite/vehicles/eric8.jpg

Here's another tire/wheel size calculator-
http://members.aol.com/agspeed/tiresize.htm

and in line with what he said..chances are.. those calculators are gonna be wrong most the time..have been for me everytime. :)