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  1. Acrobatic-Position74 on

    Hey OP

    It is just a plastic sheath to help the cable move smoothly or keep dirt off/out of the friction areas

    I would reuse them or replace them if worn though.

    Makes the shifting nicer.

  2. RandomAccountForRead on

    Just replaced a worn out one. My front derailleur cable passes through the frame and this keeps it from making direct contact. On Amazon it’s called internal cable housing.

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