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 honour of this fully-suspended chassis, the FL's model name was changed from Hydra-Glide to Duo-Glide.
Unlike OHV configuration, aluminium 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.
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