http://www.dakota-truck.net/TIRECALC/tirecalc.html

This helped me alot when buying tires. Type in your stock size for TIRE A and the size you want to compare as TIRE B and it will show you the differences in HIEGHT, WIDTH, SPEEDO CALIBRATION, EVERYTHING. A good example: my stock tires 235/70/15 are actually only about a 1/2 inch shorter than my 20" rims with 255/45/20. By using this tire size on my new rims i didn't have to recalibrate my speedo or trans shift points because the difference was so small. ps. Check out my rims i just put on what do you guys think?

 

Don't like that as well as my old mainstay tire size calculator from miata garage:
Miata Garage - New Tire Size Calculator

If that one doesn't work, then here's the old one:
Miata Garage - Old Tire Size Calculator

Much easier to use than the one above although it doesn't give you rpm and gear ratio stuff so for that I'll give ya cudos

 

Those are nice rims. Me likey.

 

Here's an even better tire size calculator.

 

^^^ I like that one the best so far, but this is the one I was using earlier.

http://www.tirerack.com/tires/tirete...e.jsp?techid=7

 

I love those rims.... now only if they came in a smaller size

 

Those look good on your dark truck Blaze1forU!! Korey

 

the rims/tires look sweet. they make your brakes look too small though. unless you like being able to change your brake pads without taking off your tires its time to upgrade to some bigger rotors. looks good though overall