Thanks. The CAAD8 I'm looking at is Optimo Alcalyte tubing. I previously had a caad 9 frame that I loved except for the fact that it was a little small and had never ending bb30 creaking. This caad8 doesn't have bb30 which is a plus to me after my bad experiences but I want something that feels as light and stiff as the caad9 did. Especially now that I'm riding a Giant TCR Advanced SL which is also very stiff and responsive.