Sorry guys, its a tire question. BUT, I have done my homework by checking the FAQ section and multiple "other" sites for this information yet im still a little stuck. Background on truck: '07 1500 QCSB 4x4 w/ 2" level, stock 20" wheels. I am going to buy Nitto Terra Grapplers and i've narrowed it down to two sizes:
The safe, i know it will fit size but will it look cool enough...?, 275/65/20 (34.07x10.83)
OR
The it will prolly look fuggin awesome, i dunno if its just a lil too big for the rim and truck, 325/60/20 (35.35x12.80)
I do not want to run spacers and i dont want it to rub. I DD the truck, 80% pavement and 20% off road conditions.
Thanks in advance guys,
Dave

 

BTW, added a poll. please vote.

 

Here is the link I used when sizing my new tires. It will tell you in inches and with a visual image how the demensions of your old and new tires match up.

Tire Size Calculator
http://www.miata.net/garage/tirecalc.html

 

IMO the stock wheels backspacing will make it impossible to not rub on the bigger tires without a spacer.

 

those numbers look about right to me but if you go to the tires manufacture site they will tell you the specs on whatever tires you are looking at.

 

If you plan on retaining the stock wheels you are gonna have no choice but to go with the smaller of the two...

 

go with the 275/65/20. theyll be plenty tall and you cant run 13in width without spacers. im running 12.5 and ive had to grind on the top A arm to avoid rubbing problems. besides the 325s are load range D, not the best for loads if thats what you use it for. the 275s are load range E and provide much better support for hauling.
Nittos are a dang good tire too.

 

A 325 on stock wheels? I run a 305 and i have less than 1/4 inch from the UCA.

 

i run a 305, and had to get spacers! i was 1/4 from the uca before i added the spacers and was running 285/70/17, so i def go with the smaller of the two, but i also run 17's and not 20's

 

I ran a 305 on stock wheel and needed a 1/4 inch. So I put 1.5 inchers