How to Replace a Bike Derailleur
Quick Answer
Remove the old derailleur, install the new one, and adjust the limit screws and cable tension.
How to troubleshoot How to Replace a Bike Derailleur
A damaged derailleur causes poor shifting and potential chain damage. This guide covers replacing front and rear derailleurs.
Step-by-Step Fix
- Remove the chain from the derailleur.
- Unscrew the bolt holding the derailleur to the frame.
- Install the new derailleur on the hanger or frame.
- Thread the chain through the derailleur correctly.
- Attach the cable and adjust the limit screws.
- Test shifting and fine-tune the tension.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| Shifting is slow | Incorrect tension or dirty cables | Adjust cable tension and clean the cables. |
| Chain rubs | Derailleur not aligned | Adjust the derailleur alignment. |
Frequently Asked Questions
Can I replace a derailleur myself?
Yes, with basic mechanical knowledge and tools.
What causes a derailleur to break?
Impact or crash, or hitting the spokes.