Shimano TY21 rear derailleur 6/7-speed mountain bike rear shifter eye derailleur reverse hook shifter
$3.46
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Shimano TY21 rear derailleur 6/7-speed mountain bike rear shifter eye derailleur reverse hook shifter for compatible bicycle and electric-bicycle drivetrain systems.
Compatibility checklist
- Match the listed number of speeds
- Confirm cassette or freewheel type and mounting standard
- Check chain, shifter and derailleur compatibility
- Compare the exact model number and installation dimensions
Installation: Correct alignment and adjustment are required for reliable shifting. Professional installation is recommended.