Compression ratio was 6.5:1, fuel was fed through a minuscule Amal 335 carburetor, with a Wipac flywheel magneto providing the spark for ignition. The power came from a little 34.6cc two-stroke single, having a 36mm bore, 34mm stroke, with BSA claiming a single horsepower at 6,000 rpm. Apparently, rear bicycle wheels were all pretty much the same, and this Winged Wheel could be fit onto any number of bicycles-as with the American-made Schwinn seen here. It was a nifty little device, really, even if a bit rudimentary, a tiny engine with clutch and gears that fit into the middle of a bicycle wheel, and selling for a quarter the price of the Bantam all you needed was your own bicycle. In May of 1953 the company presented the BSA Winged Wheel to the public. The BSA suits dithered, as suits are prone to do, but late in 1951 decided to get into the motorized bicycle business, telling the boys at the New Hudson factory on Coventry Road in Birmingham to get cracking.
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