Remember the '90s? Those were the days of crazy mountain bike designs, most of which ended up in the scrap heap of history. The complexity of engineering and the experiments with materials meant that many duallies never made it past one season of production, if they were produced at all!

Legendary Canadian bike builder Paul Brodie was no stranger to the madness (or genious). Check out the story of his 69er invention and restoration over at The Spoken.