page_title: Harley-Davidson FL
section_title: Duo-Glide
hierarchical_section_title: Harley-Davidson FL / Duo-Glide
caption_attribution_description: English: 1961 FLH Duo-Glide. Frysk: Harley-Davidson Duo Glide út 1961.
context_page_description: The Harley-Davidson FL is a model designation used on Harley-Davidson motorcycles since 1941. The FL prefix is mostly applied to Harley-Davidson's large-framed bikes, including the current Touring series, and also the Softail series, especially those with traditional styling, 16-inch front wheels, and either Springer forks or large-diameter telescopic front forks.
context_section_description: The FL model was given a new frame in 1958.  This frame included a rear swingarm suspended by a pair of coil-over-shock suspension units.  In honor of this fully suspended chassis, the FL's model name was changed from Hydra-Glide to Duo-Glide.
  Unlike OHV configuration, aluminum heads, and telescopic-fork front suspension, however, this improvement in technology was applied to the small-frame bikes first, the K-series having received rear suspension in 1952.
caption: 1961 FLH Duo-Glide
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