Biggest tires without timing or rubbing

[MF193]

Hey all.  I just bought a 2016 Sierra 4x4. I put a 3" leveling kit on it and am curious what is the biggest size tire i can go without trimming and no rubbing.  The rim size is 20". thanks! 

 

Edited November 17, 2020 by MF193
Wrong picture

[turffield]

I'm not exactly sure but I think you can fit anything between 275/50-20 to 305/40-20.  I'm planning to fit bigger tires to my KMC wheels. I might get second opinion about the tire size. By the way, your truck looks great. What running boards are those?