T47A bottom bracket
T47A is a threaded standard: the bottom bracket shell has an internal thread, so the bottom bracket screws straight into the frame. You recognise a T47A frame by a shell 77 mm wide with an inner diameter of 46 mm (T47 thread).
View all T47A bottom brackets Not sure? Use the bottom bracket finder
Sizes of a T47A bottom bracket shell
77 mm
Shell width
46 mm (T47 thread)
Inner diameter
threaded
Inside of the shell
Frequently asked questions
CEMA has T47A bottom brackets for Shimano, FSA386/Rotor/Raceface 30mm, SRAM DUB, SRAM GXP and PRAXIS M30 cranksets.
Measure the bottom bracket shell: on T47A it is 77 mm wide, with an inner diameter of 46 mm (T47 thread).
A T47A shell is 77 mm wide, with an inner diameter of 46 mm (T47 thread), and is asymmetric on the non-drive side. T47A is used mainly on road bikes and certain gravel bikes. A T47 Outboard shell is 68 or 73 mm wide, with an inner diameter of 46 mm (T47 thread). More about T47 Outboard →
A T47A shell is 77 mm wide, with an inner diameter of 46 mm (T47 thread), and is asymmetric on the non-drive side. T47A is used mainly on road bikes and certain gravel bikes. A T47 Inboard shell is 85.5 mm wide, with an inner diameter of 46 mm (T47 thread). More about T47 Inboard →
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