9. 1958 Duo-Glide
If you enjoy the comfortable suspension that your modern bike has, you can thank the 1958 Duo-Glide. This was the first Harley Davidson to feature true rear suspension. If you are lucky enough to own one of these bikes, you can set the suspension to solo, heavy rider, or two-up. Even though this bike has a suspension system, it still has the standard sprung seat making this the perfect combination of old and new features.