The tires that are currently on the wheels are 26 x 1 3/8. Well, I hope that they used to be 27" wheels, because that would be loads easier.

But, when I was looking around at old Free Spirits, I found this one that seemed to match pretty closely to what I have and it says it had 26" wheels.
http://oldtenspeedgallery.com/owner-...s-free-spirit/