WT larger tire size concerns/ recommendations - please educate me!

patdempsy · December 5, 2021

I have a 2021 WT double cab 4wd standard box 2.7L with 255/70r17 tires on the steel rd6 wheels.

I want to put some larger tires on to get abit more aggressive look. I was thinking about Falken wild peak at3w, Cooper st Maxx or Toyo open country at3. Size wise I was thinking 255/80r17 or 285/75r17 or something inbetween. I would like to see more rubber but don't want to burden the engine. Does a 255/80r17 look too skinny? What size looks best? I don't want something too wide but don't want it to look silly either.

I am willing to level the truck but I tow a tool trailer everyday and with the trailer hooked up it's already fairly level. I realize with a larger tire a level may be required though. I just don't want the truck squatted and have to add air bags.

I have been searching the web and found a post where someone with a WT talked about issues adding larger tires like speedo being off, issues with shifting and basically that these new trucks are sensitive to different tire sizes and that gm dealers need codes from gm to fix these issues but gm will only release the codes if the tire size fits with gm's requirements. If I go to a tire shop do they generally have the ability to change these things or do I have to add an aftermarket programmer?

I apologize if this topic has been beaten to death already but if anyone can give me an education on this it would be greatly appreciated as I know nothing about the subject.

Thanks in advance

Edited December 5, 2021 by patdempsy

CamGTP · December 6, 2021

I wouldn't go with a 255/80, you have limited selection on tires and they are more than likely all LT tires. So they will be much heavier and rougher riding than a passenger truck tire. Fuel mileage will suffer.

A 265/70/17 is the other stock size, it's .4 inches bigger and won't throw the speedo off much at all.

Going bigger will throw the speedo off and you'd need an aftermarket speedo calibration piece to correct that.

17's are tough, most of the bigger sizes are all LT truck tires.