I have a 76 2wd F100 and was wondering what is the widest tire I can get on the stock 5.5 wide wheel.. Thanks in advance.

 

I have 31x10.5s on my 70, and they rub the control arms near full lock, but they look fine on the rims. Not sure what a 12.5 wide tire would do. I do have a 4wd, not sure how the rubbing thing differs fromyours, but the rims should be the same.

 

If you look at the tire manufacturers specifications for tires, you will find that most list a range of rim widths for each tire. On a 5.5" wide wheel, the widest tire you can run (according to most tire manufacturers) is a 215 (e.g. 215/75R15). I currently have 225/75R15's on my 5.5" wheels and in the past I had a set of 235/75R15's on them. The 225's look like they want another half-inch of rim width. The tread has a slight arc to it, bulging very slightly at the center. The 235's looked bad on them - like they were being squeezed to death.