Harley FX Models - Classic Motorcycle Build Harley FX Models. Designed by Willie G. Davidson (grandson of co-founder William A. Davidson), the Harley FX Super-Glide combined the lighter, thinner front-end of the Sportster with a Big-Twin frame and motor. At 560 pounds, it was 150 pounds lighter than an FL model, and 60 pounds heavier than an XL model. The 1971 Super-Glide was the first 1979 Harley-Davidson FXS-80 Super Glide Values | Hagerty Harley-Davidson’s Superglide of 1971 was an ingenious combination of the company’s existing parts. Willie G. Davidson was the brains behind the idea, and borrowed significantly from the choppers that became fashionable on the heels of the movie “Easy Rider”.
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