Left: Original Schwinn S-5 Right: Kenda ReplacementA commenter recently asked about where to find tires to fit a Schwinn Racer. This is a common enough question, so I thought I'd do a post about it. I should point out that I don't really know anything about tire sizes on other models of Schwinn, just the 3-speeds that supposedly take a 26 x 1 3/8" tire. The thing is, a 26 x 1 3/8" English-size tire (or tyre, if you will) is not the same as a Schwinn-size 26 x 1 3/8" tire. I know, I know. Schwinn had a different rim/tire sizing system where rims were sized S-5, S-6, S-7 and so on. My 1961...