Question About Tire Size

AThomas7782 · February 15, 2010

Couldn't find a definitive answer so I'll go ahead and ask. Spec are in sig, 3.23 rear end. Want to go to a larger tire in the future, however I do realize I am limited.

I know 285/70/17 is out of the question with 3.23's; however, I was wondering if 275/70/17 would turn this thing into a total dog. I think I could get away with 265/70/17. How big of a hit performance-wise and mileage-wise would I be looking at?

Zembonez · February 15, 2010

I have 275-55-20s on my truck and it came with a 3.23 rear gear. It did OK with that combo (about the same overall size as a 175-70-17)

I have since gone to 3.73 gears. Much better. Mileage has stayed at about 16.6 average with both gears.

AThomas7782 · February 15, 2010

Hmm, there's only 0.25" difference between the tires you ran and the 275/70/17. I drive fairly old man-ish, however we do have some hills around here.

AThomas7782 · February 16, 2010

Does anyone else have any input?

jsciaretta · February 16, 2010

I have hear 5-10% is ok to jump up. 275 70 = 32.15 / 285 70 = 32.70. I do not see why you cannot go up that minor bit.

Zembonez · February 16, 2010

Hmm, there's only 0.25" difference between the tires you ran and the 275/70/17. I drive fairly old man-ish, however we do have some hills around here.

I really think you'll like them. I did lose about 1.5 mpg when I went from 17s to 20s.