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1934 Cotton with 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 a peak in the "Girdraulics" used on Vincent motorcycles from 1948. Girdraulic forks ...
The most common form of front suspension for a modern motorcycle is the telescopic fork. Other fork designs are girder forks, suspended on sprung parallel links (not common since the 1940s) and bottom leading link designs, not common since the 1960s. Vincent Black Lightning with Girdraulic front suspension
Instead of the previous pressure lubrication, oil was now added to the fuel. The new duplex frame had integral rear plunger suspension housings, and the Webb-type girder forks were now graced with a deep finned alloy 8-inch (200 mm) TLS front brake. The bike used a 21-inch (530 mm) front tyre, and a 19-inch (480 mm) rear.
The civilian Norton had a short center stand and the usual rear wheel mounted main stand. The girder fork springs, wheel rims and the headlamp were chromed giving it a more refined look. Not many Civilian Norton 16H motorcycles with girder frames were made making them the rarest of this model.
MAC production restarted after the war. In 1948 the MAC's girder forks were replaced with innovative air-sprung Dowty Oleomatic forks. In 1951 these were upgraded to Veloce 'tele forks' which were developed for the Velocette LE. These had coil springs with damping.
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Springers and even girder forks have made yet another come back. Magazines such as Iron Horse , Street Chopper and Show Class cater to the retro, old-school and backyard builders, and feature more DIY technology than the TV builders with their million-dollar garages of the previous decade.
The front suspension used girder forks suspended by large rubber bands, which proved to be problematic because they broke and were unavailable from H.D. after the early 1960s. A two-man seat was an available option, but proved to be unpopular likely because the machine was underpowered for two.