Calling all ye skateboard enthusiasts to check out this lovely FreeRider SkateCycle (love the complex name!), a self propelled hubless skate that allows you to rule the flat ground and any skate park! The features include 9-inch polyurethane hubless wheels, weighs 7.3 lbs, easy folding system, solid aluminum frame, durable composite body parts, and two slip-resistant footboards. The wheels are connected via a double-jointed, twisting axle, which allows the rider to twist their body and move their feet inwards and outwards, to propel the board forwards.
Just because you loved this so much, it's not a concept, but the real thing!