The Harley-Davidson motorcycle first associated with hydraulic front-fork suspension was the Hydra-Glide.
Harley-Davidson introduced the Hydra-Glide name in 1949, marking the adoption of a telescopic hydraulic front fork on its large FL motorcycles. This replaced the earlier springer-style front fork and improved the motorcycle’s ability to absorb bumps.
The Hydra-Glide designation was used for the FL range before later suspension developments produced the Duo-Glide and Electra Glide names. The sequence of names reflects changes to the motorcycle rather than completely unrelated model families.
A common mix-up is to associate “Glide” names only with touring equipment. In Harley-Davidson history, the terms also identify important chassis and suspension advances. The Hydra-Glide was an early milestone in the company’s transition toward modern front suspension.