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275/65r20 = 34x11 (1 inch taller, 1.5 inches narrower)

Yes, there are a few guys running 33x12.5 without problems on the stock wheels. Largest that you can go to without lift appear to be 315/70r17 which are 34.5x12.5 equivalent.
 

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Discussion Starter · #4 ·
I was just trying to see what 33x12.5s looked like on stock wheels and I know guys have put 34.5ishx12.5 on stock wheels so there's no problems rubbing.
 

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Running toyo a/tii 33x12.5x17s on stock rims. Zero issues. The truck should come from the factory this way. >:)
Interesting considering they dont make that size in an AT2. Theres the stock 285/70/17 which is 32.8 x 11.5. Theres the 285/75/17 which is 33.9 x 11.3, theres 305/70/17 which is 33.9 x 12.2 and theres 35x12.5x17 which is 34.5 x 12.5.
 
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Any issues with the TMPS light staying on with different tires? I know the stock tires run at a higher PSI than average.
Actually the stock tires are sorta average to low pressure for E-rated 10 ply tires in that load range. It's common to find tire inflations of 50-65psi or more for 2900lb loads. Just depends on individual tire load ratings.

You're thinking of P-rated (passenger) tires, which are also common on light pickups.
 

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And yeah, if you run tires at lower pressures, the system will complain. I think it tells in your owners' manual what the cutoff pressure is. 45psi?
 

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Discussion Starter · #11 ·
The front need to be 55 and 45 to reset them, the drive for a little bit for the signal to get sent out.
 
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