well I don't have a 4th gen at this moment and have no way to tell.
here is a picture of the wheels.
besides them being dirty they might be an upgrade over some salad tossers IMO,and I was wanting to see if any one knew any way to tell if they would fit if there was any type of measurements that could be taken.
and yes it is 5x4.75 I just missed hitting the "x" key in my first post.
I am probably going to toss them in the for sale section.