Bicycle frame and bicycle

Abstract From the Canadian patent

A bicycle frame includes a saddle stem and a head interconnected by upper and lower bars and integrally cast in a lightweight metal or alloy, particularly magnesium. At least the lower bar , and preferably also the saddle stem is cast in an, open section which is subsequently closed by means of a second casting secured in the open section by adhesive and preferably also mechanically interlocked therewith. The mechanical interlocking is provided by interengaging elements arranged at an angle oblique to the length of the castings. The upper and lower bars are joined by a structural bridge linking them at a location between the head and the saddle stem . The lower bar joins the saddle stem at …