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Hard to find Tires NOS etc Schwinn Typhoon, Early Tandem, WW Carlisle darts, Red Tycoons!
It's a tire size with a confusing number of different names. Schwinn called it "S4", but it existed in Britain and France before that. The British called it 26 x 1 1/2 for use on mid-sized rod brake roadsters usually, and the French called it 650b or "demi-balloon" and used it on cargo and heavier touring bikes. It's a great tire size but the melange of names makes it kind of confusing sometimes.