1965 Chevelle "Shadow": Rear Wheel Spec Misprint?

[BANKO]

Hey Guys I came across this awesome Chevelle in the latest CHP. I was wondering if the rear wheels specs were a misprint in the article.

The article states the rears are 20" x 10" with 29x15x20 MT Sportsman S/R tires. I'm confused since the MT site lists these tires should be mounted on 13" - 14" wheels. If these were mounted on a 10" wide wheel the section height bulge would be huge! However, it doesn't look like it in the below pics.



In this shot, the tires look more like a 12" - 13" tread width.