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BBRS500B
Shimano BBRS500B bottom bracket cups - British thread
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Outboard Bottom bracket bearing cups for use with 2-piece cap-free design road chainsets (Tiagra FC4600, FC4603 and Compact FC4650 for example)
Minimal bearing interface gives superbly smooth rolling
Required for installation of FC4600, FC4603 and FC4650 chainset
68mm BC 1.37
British thread
Replaces old part: BB4600B - BB-4600 Tiagra BB shell
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