Look like 30 x 3 1/2 clincher wheels to me. Same size as a Model T Ford so must be off a small car perhaps Dort, I know they used Frayer brand wire wheels which is what these are, note the unusual notches around the outside of the cap. <img src="http://www.aaca.org/ubbthreads/images/graemlins/wink.gif" alt="" />