Today's picture was taken in 1906, and shows a couple on an Indian Tricar. It looks to be some sort of motorized three-wheeled bicycle. I am not sure at what point in time the biker chicks started riding on the back, as opposed to in front of the handlebars. In any case, it looks like that having a bike has been a good way to get the ladies attention for over 100 years now.
Thor motorcycles were made by The Aurora Machine and Tool Company, which began as a machine shop in 1886, providing forging, castings and parts for many bike manufacturers. The history of Thor is closely tied to the history of Indian motorcycles, as somewhere around 1901, Oscar Hedstrom of the Indian Moto Cycle Company accompanied an Indian prototype to the Aurora factory - Aurora had been supplying the Hendee company with castings for their bicycles.
Red Bryan was one of the leading AMA National Hillclimbers of the 1930s to the 1950s. Bryan won eight AMA Hillclimb National Championships starting in 1938 and going through 1951, when he earned his final national title. He won his early championships during hillclimbing’s golden era of the 1930s, riding homebuilt Indians. He later became a Harley-Davidson factory-backed rider.