Originally Posted by
Kuromori
I would estimate it's closer to 1 degree per size per side since there's extra stiffness at the BB due to bigger tube sections and the chainstay bridge. The stays would bend as beams with most of the bending near the dropouts due to the taper.
Just figured out how to set the angular dimension precision on my free shareware cad program. 0.4 degrees it is. Theoretically. But it does sound reasonable that it is actually greater due to most of the flexing occurring where the stays are thinner.