BB89 bottom bracket
BB89 is a press-fit standard: the bottom bracket shell is smooth on the inside. You recognise a BB89 frame by a shell 89.5 mm wide with an inner diameter of 41 mm.
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Sizes of a BB89 bottom bracket shell
89.5 mm
Shell width
41 mm
Inner diameter
smooth, no thread
Inside of the shell
Frequently asked questions
CEMA has BB89 bottom brackets for Shimano and SRAM GXP cranksets.
Measure the bottom bracket shell: on BB89 it is 89.5 mm wide, with an inner diameter of 41 mm.
A BB89 shell is 89.5 mm wide, with an inner diameter of 41 mm. A BB86/BB92 shell is 86.5 or 92 mm wide, with an inner diameter of 41 mm. More about BB86/BB92 →
The CEMA Interlock bottom bracket system joins both sides of the bottom bracket inside the frame with a threaded connection. That aligns the bearings precisely, which prevents unwanted movement and wear. The cups stay firmly in place, resulting in a stable, creak-free solution with efficient power transfer and a longer service life for the components. The bearings can be replaced once they are worn. The press-fit cups are a classic press-fit solution.
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