Anyone know the biggest tires I can put on 17 inch rims? Just wondering what my options are. Thanks.

 

Popular size tire is 285/70/17 which is basically a 33" tire. It will fit nicely on that 03' FX4 you have.

 

assuming you are talking about stock rims, you can fit up to a 35 (315/70) but its pretty tight and you would need to crank your t-bars, you can also fit a 305/70 which is basically a 34x12, but like chris said 285 is the most popular, thats what i got on stock 17's and i am happy with it, kinda wish Ida gone with the 305's though.

 

I agree.