These conversion cups change what your bottom bracket shell will accept. They carry an external M47x1mm (T47) thread on the outside and a 41mm inside diameter that suits BB86/92 bottom brackets, so the two standards can work together.
They are machined from alloy and anodised black, and they sit inside your existing bottom bracket shell as part of the drivetrain. Installation requires a T47 16t (16 notch) tool.
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