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He set out to redesign the double chain system to make it lighter, more compatible with cranksets, and easier to service. You need to remove only one bolt and you can open it to grease or replace the bearing, without needing to disassemble the pivot axle or remove the swingarm. The prototype double chain system adds less than 300 grams, and the next versions should be even lighter. The complete bike as pictured weighs 19kg.