In the spirit of this forum (learning from each other), the idea of this thread is to collect links to bikes/frames whose design is particularly well documented with details about:
- intended use case,
- concept,
- design choices incl. tube diameters and wall thicknesses, butting and the reasoning behind those decisions,
- types of heat treatment
- geometry,
- detailed pictures
- etc.
I have not seen this done better than by Fairlight Cycles:
Their All Road bike: https://fairlightcycles.com/wp-content/uploads/2021/06/Fairlight-Strael-3.0-Design-Notes.pdf
Their Gravel/Touring bike: https://fairlightcycles.com/wp-content/uploads/2023/11/Fairlight-Secan-2.5-Design-Notes-V1.1.pdf
Their low trail Gravel/Touring bike designed for front loaded luggage: https://fairlightcycles.com/wp-content/uploads/2023/02/Fairlight-Faran-2.5-Design-Notes-Live.pdf
Their XC MTB: https://fairlightcycles.com/wp-content/uploads/2024/01/Fairlight-Holt-Design-Notes-v1.3-web.pdf
Particularly noteworthy are their dropouts which allow for flatmount and post mount calipers.