CeramicSpeed Bottom Bracket BB30 Bearings
With the BB30 bottom bracket from CeramicSpeed, you can pair 30mm spindle cranks to a 42mm inner diameter bottom bracket shell.
Cannondale pioneered this standard along with specially-designed cranks and many have found the benefits to them. Road versions have a 68mm width, MTB has 73mm. These are also the bearings you can use to replace bearings in PF30 cups.