The reason why a 275/70 is taller than a 245/75 is simply because 70% of 275 is more than 75% of 245. The 70 and 75 is the percetage of the bead to bead width IE 275 and 245. In the 245 case. 245mm x 0.75 = 183,75mm tire height. 183.75 mm to inches 7,5". 7,5" x 2 + dia of 16 = 31. But tires vary quite a bit, so it's just a rough dia. number.


Regarding rolling diameter, section width and tread width tires vary quite a bit from manufacture and model. The only thing that really stays the same is the bead measurements. IE 16" dia bead mounting and 245/275 bead to bead. What tires are currently on the truck, and what tires are you looking at? Also be aware that 245/75-16 tires fits rim widths from 6.5"-8" and 275/70-16 fits 7"-9" rims. To give you accurate data on how it will be different in section width, tread width and dia, the names and model of each tire is needed.

The middle number is an aspect ratio as in a % of the width measurement.

http://www.tirerack.com/tires/tirete....jsp?techid=46

All you need to know at that link.

The S/TZ-04 Falken is NOT the tire you want. Its a mild all season radial for passenger trucks and SUV's. I'm a CNY tire distributor/wholesaler. Also it is not rated for the weight. There should be a 'P' in front of the 275 which stands for passenger, so the tire is rated as a 4ply tire. You need 10ply's. If your looking for more height, get a LT265/75R16E. Its not going to effect things enough with that truck for you to notice other than a mild drop in mpg. Any questions, just send them my way.
*Note, the low price is due to the tire being a 4 ply rather than 10ply

ive had 2 sets of cooper discoverer atr's on my diesel. i get 50k out of them with heavy towing and snow plowing. i just bought a set of cooper discoverer at3's and love them. they wear like iron on my tuned up diesel. smooth and silent going down the road. i run a 315/75/16 and i get them for around 900 a set of 4. worth the money for sure!!!

Thanks A LOT for the help everyone, I'm going to pass on those tires and find ones that are rated for my truck, I knew there was a reason why these were so cheap so I wanted to do my research before I committed to anything.

272baja: Smart, you need E rated tires for the load. I HIGHLY recommend looking at Michelin LTX these are GREAT tires and should give you over 60,000 miles of life or more. Thextra $ you spend will be made up by the tread life.

Wannabe

I ran a few sets of the LTX's e load (now called the LTX 2) in a 265 size for about 150K miles total on an 03 2500 duramax crew and was very happy with them but they are like $900 a set at tirerack.com

yeah those are nice long lasting tires. michelin tires last forever