Built by the Saginaw Products Corporation, the Powerbike was a conversion kit that you could slap onto any pedal-driven bicycle. All you had to do was remove the bicycle’s rear wheel, bolt on the Powerbike, and then hook up a fuel tank, fuel lines, and the throttle cable. They were successful enough that Sears started to offer pre-converted Powerbikes. The big selling point was an operational cost of .25 cent per mile thanks to a potential efficiency of 100 miles per gallon.
The motor was a Briggs & Stratton four-stroke single that put out 1.5 horsepower. On average, a bicycle with this kit weighed about 125 pounds. For more on the Powerbike, check out this article in Hemmings.
This example has been restored with just some test ride mileage on it. Find this Saginaw Powerbike for sale here on Craigslist in St. Paul, Minnesota for $5,000.
This bike-uriousity brought to you by William K!