Bike Anti-Porn - When Things Go Wrong

As deep as the shit render? No.
As deep as the one of which we've seen photographs? Obviously, and nobody questioned that.

Wrong. Even in steel, 953 is substantially stronger than 853.

Wrong again. The main determinant of practical frame stiffness is torsion in the down tube, and for that a tube of circular cross section simply can't be beat.

52mm deep to be exact. The one in the photographs is 48mm.

I'm not an expert like you are.

This is the input I was looking for. Thank you.

853:

UTS: 1250-1400 MPa, density 7.78 gm/cc

953:

UTS: 1750-2050 MPa, density 7.8 gm/cc

The strength is a lot more. They don't have stats for Aero tubes.