These conversion cups let you run a BSA/English bottom bracket in a T47 frame. The outside is an M47 x 1mm T47 thread that goes into the frame, and the inside is a standard 1.37" x 24tpi thread that suits internal and external BSA/euro bottom brackets.
They are machined from anodised alloy to the tolerances needed for a secure interface with the frame. Installation calls for a T47 16t (16 notch) tool.
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