Originally Posted by RChung

A friend has a cross bike and an older aluminum Cervelo Soloist, and a couple of years ago he did some field tests on them. His "standard hoods" positions were different enough that there was a considerable difference in CdA between the two. IIRC, his CdA on his cross bike was almost .05 m^2 higher than his CdA on his (then old but now ancient) Soloist. There must have also been some difference in Crr but I don't recall what they were. He didn't look at CdA in the drops position.