How big can tires go?

Stmb1500

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New here, looking for real world experience from people.

Completely stock 2025 1500 AT4 LZ0. Came with 275/60R20 tires on the 20x9 silver machined wheels with dark pockets. I will be keeping the factory wheels.

I want to put new tires on but not modify anything else. No level, lift, no wheel spacers, etc. Fine with minor trimming. Have the dealer mudflaps that hang down 6-8" from the wheel well.

I'm pretty set on non-LT rated Toyo Open Country AT3's. That said, what are the biggest tire sizes (and tire model suggestions) people have fit on stock rims and suspension?

Stock size: 275/60R20
Debating:
275/65
285/60
295/55 - My research says this is the best bet
295/60
 

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