Before and after pics when you get the new set mounted!

 

will be a slightly larger diameter than the stock 275/50-R22’s that are on there now. Probably only an inch

an inxh isnt much, but it could make your pseeod off, which messes with everything from gear shifting to torque algorythms in the ECM

just an fyi

 

I put AT4 take-offs on a '21 1500 Denali with no rub issues.

I intend to put them on the '23 when winter returns.

 

Handy site for such things. Tire Size Comparison

 

3/4 of an inch difference unloaded, 11/16 difference mounted and the truck on its wheels difference. Should be fine.

 

The deed is done. Long day swapping because it turned out that the TPMS sensors were different. I SHOULD HAVE broken one of each the new and old open to check before mounting them all on the truck. But that’s something smart people would have done. I only discovered the issue when I tried to program the sensors in the new wheels and the truck wouldn’t recognize them. I thought that maybe my super duper $9.00 programming tool was the problem, but once I finally cracked a few open it was obvious that the sensors on the 18’s were different than those on the 22’s. I thought that perhaps the wheels and tires might have possibly been off of a 2022 instead of a 2023, but I checked the tire date codes and they were all from mid-August of ‘22. So the mystery of the different sensors is for another thread.

So after the fun of opening up all eight wheels and swapping all eight sensors the original ones were easy to program to their proper corners. Nothing rubs even though these new tires are a full inch bigger in diameter than the original ones. Personally, I think they look much better on the truck than the 22’s did. Now I just need to decide what I’m doing with the 22’s…

Pictures, as promised:

 

You're right. Those 22s are...not good.

The AT4s are a great improvement!

 

I just picked up a new to me '21 Denali with the black gloss 22"s and had planned to make this swap from the start. I live in the country in ND where we definitely get 4 seasons and I commute 140mi/day. The 22s aren't going to cut it this winter! Glad to see this swap works. I have some AT4 18" take-offs coming as well, hoping for less hassle with the TPMS sensors but I do have a tire machine at my disposal should the need arise.

 

Made the swap last night and for a second thought I was going to have to change the sensors out as well. Maybe I’m not very bright or I can’t read directions well (or both) but once I pointed the transmitter at the correct location I was able to relearn the new sensors. I think the ride is noticeably better. These tires are much louder but I expected that.

 

Looks great guys!

I am thinking of doing the same wheels on my 19 LD.

 

I’m glad I made the swap. I think the 22s look nice but rode a lot rougher than I liked. Sidewall makes a big difference!

 

Well Shoot…. I’m back to the ugly 22’s for a while.

After driving on the 18’s for a month I started to suspect my speedometer was running fast. The overall diameter of the 18’s is just ever-so-slightly more than that of the 22’s, so I was expecting the speedometer to run slightly slow instead of slightly fast.

With the stock 22’s my speedometer would run either right on or roughly 1 MPH higher than my actual GPS-confirmed speed depending on tire pressure. With the 18’s the truck was reading a consistent 3 MPH too high regardless of whether I ran them at 35 PSI or at 41 PSI. In other words, cruise control was set for 75 MPH but the truck was only going 72 MPH.

All I can figure is that the taller sidewalls settle a bit more under weight so that while the side-by-side heights are nearly the same between the 22’s and the 18’s, the actual rolling radius is less for the 18’s.

After doing a bit of math I realized that at that rate, when my odometer read 36,000 miles I’d only have 34,500 miles on the truck. Hardly earth shattering, but since the truck is under warranty I’d like to get the full 36,000 mile warranty instead of just a 34,500 mile warranty.

So for now the 22’s will live on the truck until I can figure out a better tire size to mount up on the 18’s.

 

I am running about the same as I was with the 22s but that could be because the tires on the 22s were not brand new and close to replacement need. When I set cruise at 75 I would be at about 74.5 with the 22s and am at 74.2 or so now. I don’t know how accurate using a speedometer app on my phone really is but I’m in wide open country on the interstate traveling a consistent speed so I think it should be close.

I was considering buying a device to adjust the tire size down but it’s so close that I’m just going to run with it! I appreciate your position related to warranty and would do the same thing in your shoes.