I can confirm that they actually do NOT fit. Bought a set to try. They will need at least a 10mm (3/8) spacer if not more to clear the bottom, outside portion of the four piston calipers. If anyone needs more pictures, ask and I'll try and take some different angles before reselling them.

These wheels do NOT fit GMT800 after adding the 4 piston calipers.

This is the not the minimum gap. It needs more room to safely clear the caliper.

It hits the caliper on the lower section of the caliper, not the hump.

 

That is interesting. I believe it has to do with how the wheel mounts in comparison to the T1XX. I did know that the wheels were tucked closer to the brake calipers but I figured it would still work.

 

Hello! I put this together hoping anyone might have some first hand experience with trying any of these wheels with the 4 piston swap, I want to do the brake swap but need to make sure I get compatible wheels first. This will also help others that have any of these stock wheels understand if they can fit the big brakes before spending a bunch of money on the brakes and not being able to install the them.

Looks like it was confirmed that #3 does not fit in the above postings.

I currently have wheel #4 and was hoping they would still fit, but would consider moving to any of the other 4 wheels in the pic if any of them fit with-out using wheel spacers at all..

 

I am inclined to say no but I am not sure we don't know the backspacing.

Number 3 fits for sure. Don't know about the rest.

 

I believe you misspoke, number three absolutely does not fit. I'm the one who tried them and posted pictures above.

Op, I do not believe any of the wheels you posted will work. The sure fire way to find OEM wheels which work is to look for wheels that were not issued until 2019 or later.

 

Ah yeah that is correct.

requires a spacer.

 

​​​​​​​None of those fit directly. This might help

4 piston calipers fitment with which wheels, list. - PerformanceTrucks.net Forums