I have an 09 FX4 Supercrew with a 2.5" leveling kit and currently have 20" wheels with 275/60/R20 tires on it. On the front I currently have approx. 3" of clearance from the outside tread of the tire to the bumper(tires hardly have any tread wear). Heres the question what is the biggest tire I can put on it?
33-1250R20LT? or possibly 35-1250R20LT?

 

i have 2.5" as well...with 35 1250 20 toyo mt's on. I just had to trim the air dam on the front bumper slightly.