BB30 bottom bracket
BB30 is a press-fit standard: the bottom bracket shell is smooth on the inside. You recognise a BB30 frame by a shell 68 or 73 mm wide with an inner diameter of 42 mm.
View all BB30 bottom brackets Not sure? Use the bottom bracket finder
Sizes of a BB30 bottom bracket shell
68 or 73 mm
Shell width
42 mm
Inner diameter
smooth, no thread
Inside of the shell
Frequently asked questions
CEMA has BB30 bottom brackets for Shimano, SRAM DUB, SRAM GXP, FSA386/Rotor/Raceface 30mm, CAMPA UT, PRAXIS M30 and BB30/PF30 cranksets.
Measure the bottom bracket shell: on BB30 it is 68 or 73 mm wide, with an inner diameter of 42 mm.
A BB30 shell is 68 or 73 mm wide, with an inner diameter of 42 mm. A BB30A shell is 73 mm wide, with an inner diameter of 42 mm, and is asymmetric on the non-drive side. Although 73 mm is usually associated with MTB frames, BB30A is used mainly on road bikes and certain gravel bikes. More about BB30A →
A BB30 shell is 68 or 73 mm wide, with an inner diameter of 42 mm. A PF30 shell is 68 or 73 mm wide, with an inner diameter of 46 mm. More about PF30 →
Still not sure?
The bottom bracket finder takes you to the bottom bracket that fits your frame in a few questions.
Go to the bottom bracket finder