Two versions of the Big Twin were offered. The FL's

1958 Harley-Davidson FL Duo-Glide Pictures

In 1958, the FL got a new frame with a modern swingarm with coil-over shocks. Despite the new rear suspension, however, a sprung seatpost remained standard.

The speedometer got its own chrome stage.

The FL Duo-Glide's triple-headlight setup was part of the big-Harley image.

"Duo-Glide" referenced the FL's coli-over-shocks rear suspension design.

The FL Duo-Glide's "see and be seen" items included chrome fender tips.

An advertisement for the 1958 Harley-Davidson FL Duo-Glide motorcycle.

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