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New bottom bracket does not fit - am I wrong?

Bicycles Asked by nammerkage on August 8, 2021

I bought and isntalled this bottom bracket;

VGEBY1 68X120mm, Thread info: BSA 34.798mm 1.37*24TPI

However the arms was too long. So instead i bought;

Shimano UN300 68X 110mm, Thread info: BSA 1.37*24

However, it seems like this Shimano bottom bracket does not fit in the thread no matter what I do.. Should it fit? It seems like it

One Answer

The critical information here is the three letters "BSA," which indicates the bottom-bracket standard (British). Both BBs are British, so barring a manufacturing defect, they should fit the same. I'm sure you've greased your threads and confirmed that you're screwing the correct cup into the correct side: the right side is reverse-threaded.

Correct answer by Adam Rice on August 8, 2021

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