Max Knight created the Walking Bike from 8 pairs of sneakers and some fancy wheel modifications. You can check out the YouTube to see how it rides. It is not exactly a smooth spinning machine, but I have a sweet spot in my heart for anyone who builds bike wheels. If you look closely, it appears Max has included the thoughtful touch of a black ankle sock for each sneaker. If you are a wheel builder, you know that the devil is in the details.
(Photos of Max Knight's Walking Bike taken by Thomas Brown and lifted from the arkitip site.)
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