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Balloon Tire
From WikiPedalia
A wide, low-pressure tire, typically 2.125" (54 mm) wide. The development of balloon tires and "streamlined", curved-tube frames created a mini bike boom in the 1930s. These bicycles are pretty much indistinguishable from modern cruisers, and were the ancestors of the mountain bike, which was built around the popular-sized balloon tires.
