I have a 2009 F-150 XLT 2WD S Crew with the Chrome option with 18" factory chrome wheels. It haws 265/60R18 tires as factory, but I would like to know what are my larger option tires without having to do a leveling kit or even worse an entire lift kit.

 

I know that you can put 275/65/R18 on since it was the tire that came with 4WD. It's about 1.5" taller and a little wider.

The most important thing when changing tire size is to buy a programmer so you can recalibrate the speedometer. Most people never take that expense into account.

 

Not sure of the largest that can be put on a 2wd, but just because it fits on a 4wd does not mean it will fit on the 2wd. The 2wd is 2" lower than the 4wd. My understanding is that without a leveling or lift kit, the largest tires that can be used are 31" for the 2wd and 33" for the 4wd.

 

I have 295/70/17s on my 2wd. It was a 33.3" tire and it fit without a level. Not sure what the tire size would be for 18's

 

It fits. The 2WD with optional 20" wheels uses 275/55/R20, which is the same diameter and width. It's roughly 32" in diameter. The 275/65/R18 is also 32" tall.