Procedure describes installing aftermarket bearings in OEM Shimano "DO NOT DISASSEMBLE" external bottom bracket bearing cups.

It was a fun project and I couldn't find any thorough guides for this replacement/upgrade. Hope this helps. Any questions, leave a comment. Thanks for watching.

BC1.37x24 ROAD
SM-BB52
BB-RS501
BB-MT501

Intro: (0:00)
Construction & Dimensions: (1:53)
Shopping & Parts List: (5:53)
Disassembly, Finally: (8:04)
Installation: (12:31)

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