The rear derailleur is mounted on the derailleur hanger, which ensures that your bike's gears can shift correctly.When threading is in bad condition, this leads to substandard derailleur and bottom bracket alignment. The service's feasibility depends on the level of damage.The technician will visually inspect if it is possible to perform service properly.
This service includes for the derailleur hanger:
Removing and fitting the derailleur, threading, checking derailleur hanger alignment with the frame and adjusting the gears.
This service includes the bottom bracket:
Removing and re-fitting the derailleur, threading, tightening up the bottom bracket, checking alignment with the frame and adjusting the gears.