Hi everyone, I have an 06 FX4 with stock 20's I have 275x55x20 tires on them now but I want to go to something bigger and more agressive. I have already installed a 2" leveling kit so what size tire can I go up to? Thanks in advance.

 

35" is the tallest before needing additional lift

 

I was looking for more specific tire sizes. A guy at a tire place told me the options are very slim for the stock 20in rim

 

305/55/20 is a good readily available tire

 

275/60/20
275/65/20
285/60/20
285/65/20
295/55/20
295/60/20
305/55/20

All of those should fit. The 285/65/20 is the tallest of the bunch and might rub. The 305/55/20 will come close to contacting the upper control arm depending on the tire you choose and the sidewall lugs aggressiveness.