I have an 18 STX 4x4 crew cab with stock 275/55/20 tires. I am going to add a 2.5 inch front leveling kit from MotoFab. What's the biggest tires size I can upgrade to?

 

Hey, you're the second one today to ask that question.
No door prize though.

 

What offset wheels? If using a +34 like on a Raptor, a 315/70/17 will work nicely.
Wheel offset is going to be a big deciding factor.

 

If you have stock wheels then 275/65/20 will fit with no issues.

 

@BooDiddyThe stock size tires are 275 55 20. I wanted to know if 295 65 20 or 305 65 20 would fit and would either one of those tires fit as a spare underneath the truck.

 

He said "if you have stock wheels" as in the +44 offset wheels...lots of guys ask this question then we find out they have -20 offset wheels and 4 inch spacers.

As mentioned above, a leveling kit will let you fit around a 35x12 tire on stock wheels. There are hundreds of posts on this and theres also a sticky right above this with an excel sheet of actual results from people.

If you want to know about a specific metric size such as the 295/65 (35x11.5) or 305/65 (35.5x12) you should check the "will it fit" thread as well as the leveling kit thread.

 

That will depend on the offset of the wheel. Once you move up to a 35" tire you may have to trim some things up front to get them to fit with a 2.5" level. I do not know if a 35 will fit in the spare tire location.

 

with stock wheels with +44 offset you can fit a 285/65/20 without any trimming or cutting.