For 2021 (the year of my Trailhawk), the Jeep brochure shows that there were three different sizes of tires:
-- Trailhawk: 215/65R17 (which mine indeed came with)
-- Limited and Latitude: 215/60R17
-- Sport: 215/65R16
By the way, to my surprise if you understand tire sizing and aspect ratio, it looks like they had theoretically quite-different circumferences:
-- Trailhawk: 87.9"
--Limited/Latitude: 85.3" for the Limited/Latitude
-- Sport: 84.8"
That's more than a 3" circumference difference between the three tires, which means the speedometers would have had to have significant calibration differences to display the correct speed.
If the 2023 Trailhawk indeed comes with 235/55R17 tires, they would have a theoretical circumference of 85.3" --coincidentally identical to the 2021 Limited/Latitude.
The question is, what the dimensions are of a 215/65R17 tire are (like the ones that came with my 2021 Trailhawk), compared to a 235/55R17? Yes, that results in a bit smaller diameter than my 2021 Trailhawk's.
But just by 0.8" -- which again I assume the speedometer is calibrated for. On the other hand, they'd be nominally 20mm wider. Whether that's better for offroad conditions or for snow, I don't know. I think yes to the first in general, but no to the second.
The Trailhawk has a lot of wheel-well gap anyway because of the increased suspension height; so I doubt the 0.8" difference would be very noticeable. And the "skinny" 215 tires on my 2021 Trailhawk are kind of noticeable...
