That’s very cool. I’m occasionally inspired by the potential of a lightweight single speed or single fixed training (ok, riding, these days) bicycle.

I’m similarly inspired by photographs of Bill (W. B.) Hurlow’s five speed trainer, which was listed on eBay at an aspirational price several years ago. The essence of (relative) light weight and simplicity. I’m a track crankset that’ll accept a 39t away from commencing such a project, which would also involve finding a 531 Professional or 753 frame to suit…