How This Man Brought the 1967 Gyro-X Self-Balancing Two-Wheeler Back to Life

At the far end of the field, hundreds of yards past the 1930s Duesenbergs, the prewar Rolls-Royces, and the grand touring Ferraris, curious showgoers at the Pebble Beach Concours d’Elegance gather around a particularly unusual kind of car. They listen to the quiet hum and puzzle over the thing, bright red, about 15 feet long, …

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