Originally Posted by
Steve_sr
I was really surprised too. Unfortunately, I can't go back to compare the two with the A23s at lower pressure. With the 20mm Aerohead the sidewalls were less vertical and the entire casing bent to absorb the bumps. With the A23 the sidewall is much more vertical so you are trying to directly compress the sidewall which has much less compliance in the vertical direction.
That sounds more like the Aero extrusion: