I have an 04 FX4 with stock 275/65/18 tires and wheels. What is the biggest size tire I can put on my stock rims? I drive on gravel roads and I am concerned if I go too big I wil throw too much gravel!

 

You can fit 35's on your oem wheels with a leveling kit or 33's with aftermarket wheels.

 

i would go with a 285/65/18, almost 33" i am running this setup on my 04 fx4 and have not had a single problem.
tire suggestions:
1. toyo open country a/t or m/t
2. nitto terra grapplers
3. bfg a/t or m/t

they are a bit pricey with the 18" wheel. my toyo a/t's were $245 apiece.

 

I vote for toyo open country m/t

 

Thank you for the help and GR88888t truck! I cannot replace the wheels but will take your advice on tires. Thanks.

 

Thank you for the help.

 

Thanks alot bro, and anytime.

 

Keeping the tires on the stock wheels will help keep rock's and road splash inside the wheelwells. I had the same problem.

 

Also, tread design has a lot to do with how many rocks are thrown. I can tell you from experience that BFG AT KO's sling small rocks bad.

 

my toyos are not as bad as i imagined them to be at slinging.