Biggest tires on stock wheels

I know this is for a 2021- but this is my research. You might check for more answers. I plan on going to Discount Tire and trying different sizes when I purchase View attachment 1419View attachment 1420
Thank you for posting this. I had my local Discount Tire order 285/65/20s, 275/65/20s, etc for trial. I have a Yukon AT4 XL without air suspension and my wife wants the tallest (not widest-think tall and skinny) tire on 20" stock rims that will fit and I swore the 285/65s would fit, even 275/65s at worst and Discount Tire was adamant none would fit and that I must go back with stock tire size and I didn't agree with them and walked out. Trying to figure out if a 285/65 or 275/65 will fit. The one nugget I did find out there was that when trying out tire sizes for rubbing purposes if it will fit on the left front tire it will fit on all the other 3 corners FYI.


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