So I have a 2011 FX4 with the stock 18x9 wheels. Can I run 275/70r18 tires on the my stock rims? or is the rim width to narrow?

 

That size will work just fine

 

You're good to go, that's what I'm running.

 

That's the size I'm running. No issues.

 

Stock would be 275/65/18, so by going up an inch in diameter to a 275/70/18 does not change the width of the tire whatsoever. In fact, generally the higher aspect ratio (the bigger the second number) the wider tire you can run on the same rim. That means the 275/70/18 is very slightly a "better" fit than OEM width wise.

 

I thought stock fx4 wheels were 18×7.5, at least thats what my 2013 has.

 

Even if they are it wont be an issue for that size.

 

Running 275/70r18 Michelin LTX MS2 E's with no issues

 

Hell I run that on my 2wd no level no rub

 

I'm running that size in Fierce Attitudes on my STX. No rubbing at all