I have a 2021 Yukon SLT without any fancy suspension and 20" tires and find the ride pretty good considering this is a big SUV. The ride is even better with my winter tires and wheels. I use 18" allows with 275/70 R18 and the higher sidewall allows the the tires to absorb the road conditions even better than the 20". That being said, they are a little noisier because of the more aggressive thread.
When you look at the tire size comparison, other than the higher sidewall, the diameter and width are practically the same.
![20220206_104838.jpg 20220206_104838.jpg](https://www.tahoeyukonforum.com/data/attachments/356/356866-d030fa54b644a7af0a6906c3f0e700c0.jpg)
![20 inch vs 18 inch tires.png 20 inch vs 18 inch tires.png](https://www.tahoeyukonforum.com/data/attachments/356/356875-47d710196bed992f7e49005552ba485b.jpg)