Why has the Shimano external BB I just bought got smaller cups and an adapter to make them fit a regular Hollowtech2 BB tool?
The main reason is that the metal tool often damaged the external bottom bracket due to hand cackiness, the plastic adaptor prevent this.
@edscoble started
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Why has the Shimano external BB I just bought got smaller cups and an adapter to make them fit a regular Hollowtech2 BB tool?