Spine frame
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A frame whose main structure connects the steering head and the swing-arm pivot, which the engine suspended beneath it. Spine frames are most often constructed of pressed steel, but can also be tubular construction. Often called a Backbone, "T", or "7" frame as this describes the shape of the frame.
This type of frame is made up of a combination of pressed steel plate and steel tubing. This basic frame design is used mainly on scooters and some of Honda's early motorcycle designs. Back-bone construction allows added freedom in the overall design of the vehicle and relatively economical production.