Replacement for the B01S and B03S models
The RD-M9100 rear derailleur pulleys are wear parts that must be kept in good condition to ensure the drivetrain performs to its full potential. It is strongly recommended that you replace the pulleys after one season or 7,000 to 8,000 km, or when significant wear is visible. Please note there is an upper and lower pulley.
The pulleys’ internal bearings are sealed.
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