Designed by Max Knight for his friends at Arktip, the Walking Bike uses shoes to form the tire. In fact, instead of using rubber tires, it uses the rubber soles of the shoes to grip the pavement. Believe it or not, the Walking Bike isn’t just a piece of art work. It is functional…well, sort of (see the video). It just doesn’t provide the same “comfort” (smoothness) as traditional tires.