Just bought a Carlton Giro

[Corsa of Course]

So this week I managed 45 miles 3 x 9.3 mile loops and a a 17 mile ride on the Giro. The bottom bracket is definitely lower than the Corsa and Super Course. The front forks are more curved as well. I wonder if the position is more aerodynamic. Has anyone played with this height.

 

[Corsa of Course]

It seems modern aero bikes are using a bb drop of between 66 and 78 which hasn't changed much. Although Cervelo's P5 time trial bike mentions a lower bottom bracket height than its predecessor to reduce drag.