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  1. #1

    Default Tire Size Question

    I have a 2005 Z71 4X4 with 265/75R15 tires. I have had great wear and tear on the tires, 178,000 miles and only 1 tire change. My issue is at this tire size there is a very small section of tires and tread types available. I used an online tire calculator and it seems tires sized at 31/10.50X15 are just slightly larger and wider then the original. No more then a 1/4" either way.

    Has anyone put this size tire on the stock rims and had any issues or is it a good fit?

    Thanks for the help.

  2. #2


    I haven't seen 15 inch rims in a long time, 16 was the standard for a while. I checked for the size you have and only 8 results came up, which is low.

    On the other size I think you are missing a number at the beginning. It looks like there were 2 options from GM for your truck from the factory:

    245/75R16 or 265/70R17. There are allot more options at those sizes. Could you take a picture of the tire/rim so we can see the numbers on the tire?

  3. #3


    The 31s are smaller height wise than the 265/75s. The 265/75s measure up at about 1/4 inch under 32 inches at least thats what my Coursers come in at.

    If at first you don't succeed, get a bigger cheater bar.

    1999 GMC Sierra SLT Z71 | 5.3 "Vortec" | Spectre "Cold Air Intake" | TransDapt TBS | Hypertech 30005 Tune | 2005 Chevy Tail Lights | Denali headlights | Grill Mounted Fog Lights | AWS Bug Shield | 265/70/16 Futura Scramblers | Boss HD Speakers | 2005 Overhead Console | Flowmaster Super 40 mufflers 2N1O | Mostly stock-ish
    Bigger Amp Alternator | Electric Fans | Transmission Fluid cooler | Paint (Halfway there)| Interior Restoration/Upgrade with newer model parts | Window Visors (In channel) | Tint | Low-Profile Tool Box | LEDs throughout stock cab locations (68% Done) | And whatever is spurr of the moment
    CVN-69 "IKE-ATRAZ" AIR/V-2 Gear Dawgs

  4. #4


    Hello. I just put 31 x 10.50's on my 05 Z71 yesterday. I assure you they will fit on the stock rims with no issues what-so-ever. They look a lil larger/taller than the stock 265/75's. Hope this helps!

  5. #5

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    15 inch rim on a 2005 Z71 Colorado/Canyon doesn't seem right, did you buy this new? Or used and somebody put a different rim on it?
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

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