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Biggest tires on AT4 20" stock wheels with NO modification

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Just ordered BFGoodrich All Terrain T/A KO2s for my 2020 Sierra 2500HD. Size is 285/65R20 (only 1/2" larger than the stock 275/65R20). I'll let you know how they look/fit, but shouldn't be an issue at all with rubbing and what not.


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LT295/60R20 Nitto Ridge Grapplers on stock AT4

35x11.50x20 Ridge Grapplers. Bought the truck last thursday and had these installed two days later. Zero rub, smooth, ride great.

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I have a new 2021 GMC Sierra 1500 AT4, 4WD, Crew Cab Short Box. It has the factory 2" lift.   I have the stock 18" tires and rims that come with the truck. 

I am looking to go 20" rim but need to figure out what is the biggest tire in a 20" that I can put on without rubbing or doing any trimming.   I am just looking for the aesthetic of biggest tire and that it comes out of the wheel well just a little.


I have been researching it and seen so many different sizes such as





The rims I am looking at putting on are

Fuel Zephyr.    20x9 +18mm offset

XD842 Snare. 20x9 + 20mm offset


Any input is greatly appreciated.   Picture of the truck I just got.


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  • 2 months later...
On 5/14/2019 at 6:04 PM, destrada127 said:

I had accelera m/t 01 35/12.50 on stock 20s and just mounted 37s today so if you're interested in them I'll sell them to you. And you can see that I fit them with no problem. I did do a 1.5" motofab leveling kit to fix the rake (which is also for sale) but it was not added until a month laterd1337df7220039585d85cfda660d0d9d.jpg36b0a1541b82caf5717b16f47d010144.jpg0c4c3a2e222a355fb608af3e938d2c01.jpg30f3a64dcb531064d20dd15767c693a7.jpg

Sent from my SM-G975U1 using Tapatalk

Hi sir I know this post is old by now... Do you think I could fit 22" wheels with the same size tires? I have a level kit I plan to install as well.

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