Show HN: I made a vertical-pedalling bike with a novel drivetrain [video](youtube.com)
youtube.com
Show HN: I made a vertical-pedalling bike with a novel drivetrain [video]
https://www.youtube.com/watch?v=4HLOsi2gWXQ
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https://www.youtube.com/watch?v=4HLOsi2gWXQ
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