the"Girder fork"

One of the earliest types of motorcycle front suspension. The girder fork consists of a pair of uprights attached to the triple clamp by linkages with a spring usually between the top and bottom triple clamps. The design reached its peak in the "Girdraulics" used on "The Vincent" motorcycle. Girdraulic forks featured forged alloy blades for extra strength and hydraulic damping.

While it may have an exposed spring near the triple clamp, a girder fork is distinguishable from a springer fork by the wheel being fixed firmly to the (usually a long diamond shape) upright. The pivot points are short links mounted to the top and bottom triple clamps. The spring is (usually) mounted to the girder and compressed against the upper triple clamp.by frame