These 10 wheel bikes were outfitted with 4HP Tecumseh HS40 engines and for the first time Rupp used a slanted engine plate with diaphragm carburetor.
These 10 wheel bikes were outfitted with 4HP Tecumseh HS40 engines. The style of the frame completely changed and for the first time Rupp used a slanted engine plate with diaphragm carburetor.