Ok guys, what would i need to do here?
I use my factory 16 inch rims for winter on my 97 f150. And for the summer i have a set of 20's , but i noticed the inside of the 20's get worn on the inside kinda like a ball joint problem but my 16's are fine so i know it isnt a ball joint problem. What do i need to do to be able to adjust suspension in spring for my 20's and back to my 16's in fall?

 

The tire's are getting worn? Or there's wear marks on the wheel itself?

If it's tires chances are you need a new alignment when you switch them out.

 

So you think i need an alignment for each sizes of rims?

 

Probably an alignment issue like mentioned. You may want to consider replacing the tires on one set of the wheels to have the same overall size as the other set. If you go this route you might want to buy them from a place that offers a lifetime alignment even.

 

It's highly possible. Especially if the tires are worn different it can make wearing on a set more noticeable.

 

ONLY the 20 inch tires get worn, not the 16's. And they are worn like it was a bad ball joint. But i know the ball joints aren't bad becuase the 16's are mint.

 

But if the alignment was set with the 16's and the 20's already had a minor wear pattern on them, a different alignment could then really bring that wear pattern out.

 

You may want to consider replacing the tires on one set of the wheels to have the same overall size as the other set

 

Size of the tire wouldn't make a difference with the alignment.

 

Definitely have the alignment checked. That can really mess up a set of tyres.