St. Louis-based Dynacycle invented manufactured bike kits and motorbikes. A gasoline motor could be attached to any balloon-tired bicycle in place of the crank and peddles and then mounted to the frame. The company claimed to have the smoothest ride of all bike motors on the market due to its Dynamount suspension system, which included rubber rings in the crank housing. The four horsepower engine delivered speeds of up to 45 miles per hour. This bike has a custom-built side cart. It was used by a local grocery store to deliver goods to its customers. Approximately 200 bikes and kits were sold and it is believed only about 30 are still in existence.