Retro mountain bikes

The Disk Drive offered a bit of suspension to many of the overly rigid rear-end designs of the day. The Kevlar strands that acted as spokes allowed the hub to "float"; square-edge hits were tamed and traction was increased quite significantly. Perhaps best of all, was the wheel's ability to store energy as it flexed into the apex of a turn, and then release that energy when exiting a turn, which made it feel a bit like you were being spit out of the corner.

nice in theory, but apparently detonated at the merest suggestion of rough terrain