Schwinn Tires

There have been many tires from Schwinn.
Schwinn tires can be very hard to come by. I was looking for some Schwinn Superior white walls for a long time before I found them on Ebay. They have names like Schwinn Fastback or Westwind.
Tires are often referred to by their size – example 26″, 24″, 20″ etc. (inches). Schwinn specific tires are also referenced by the “S” term: S-7, S2, etc. Vintage Schwinn tires width were in fractions like “26″ x 1 3/4″.