What is the correct rear tire on my '68 Krate?

[nick tures]

I thought that about the rear rim. Did they ever make a brick pattern for the S-2 20 inch?

yeah i have seen them but probably from old schwinn 20'' balloon bike somewere in the 50s

 

[Matter]

Correct about the S-7 on the Krate.
Yes, the Run a bout has S-7's on both ends. Made me curious so I was able to get the serial number off that also. ED01754. Didn't realize they usually came with S-2's.