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I think doing a deeper dive on current geo trends it’s once again an example of bike designers taking the easy road of what’s popular - like with fork offsets - rather than choosing spec/geo that’s best for a given size or application.
Just talking FS bikes and not accounting for personal preference...
Effective seat angle for a XXL bike with 525mm Reach probably should be 81-degrees.
Effective seat angle for the XS of the same bike probably should be closer to 74.
Look at that... there’s room for 6x sizes in between. The M and M/L are where the bike jumps from 27” to 29” wheels.
Oh, and the rear center of the XS can be 430mm and let’s add 5mm per size.
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