Let’s slap a BB30 sticker on it!
Before we get started, there is a good chance your Cannondale frame has a BB30 logo on the down tube. Cannondale is the company that invented the BB30 standard in the early 2000s and they printed a gazillion stickers that they are still trying to get rid of today. Ignore it. There is no guarantee your frame is actually a BB30 frame.
What’s with the A?
The A in BB30A and PF30A stands for Asymmetric. The bottom bracket shell is made 5mm wider on the non-drive side only. According to Cannondale it makes the system wider and stiffer. Other benefits include making shorter seat stays and helping with the Ai, Cannondale’s off center rear triangle and wheel system.