IDing 40s steels. 4" or 4-1/2" wide? Easy how to.

[Mart]

Originally Posted by Flathead Fever

It seems like any 16" rim would measure the same distance. That makes it look like there are two different diameter rims. I wouldn't want to put a 16" tire on a 15-inch rim.

You're missing the point.

I'm not measuring any diameters. I'm showing the relative alignments of the rims against the centres. The 4-1/2" wheel is 1/2" wider, so sticks out 1/4" more than the 4". You can see the difference using a straight edge.