@SFOMuseum Twitter Posts This is SFO Museum's archive of the @SFOMuseum Twitter account.
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The evolution of motorcycling dates to the bicycling craze of the late-1800s. Bicycle racers found they could pedal with less effort in the slipstream created behind another racer, a "pacer," and then use their reserve energy to pass that rider. #EarlyAmericanMotorcycles . This tweet was posted on February 16, 2021.