tire size help

[ernursing21]

what is the max tire size (and not affect turn radius or rub) for a 2018/2019 2500 HD Laramie crew cab 6.4 bed, diesel with--
sport/night package--?
4x4 package--?

if you add a leveling kit does it change? what size now--?

if you have a rear air suspension system does this affect the size of the rear tires--?

 

[johanh13]

On factory 18" wheels, I would go with a 285/75r18. These are just over 35" tall and about 11.25" wide. I went with 35x12.50r18 on stock wheels and they would rub the radius arms at full turn. I now have the 35x12.50 on 18x8.5 wheels with 15mm offset. These do not rub, but they are about 1/4" from touching when wheel is turned about 1/2 way. Lifting 3" or less will do little to nothing to add clearance...
My local tire dealer had the 35x12.5's in stock and the 285/75's were on backorder, else I would have the 285's...
Rear air suspension does not restrict/enhance tire clearance at all; 37x12.50s will clear with factory wheels or 10" wide 00 offset aftermarket wheels...