https://www.bikeforums.net/bicycle-mechanics/955466-half-step-triple-using-double-parts.html#post16877556
Unfinished project, needs CAD/CAM to finish: twin big ring and FD cage
@Kimmo started
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https://www.bikeforums.net/bicycle-mechanics/955466-half-step-triple-using-double-parts.html#post16877556
Unfinished project, needs CAD/CAM to finish: twin big ring and FD cage