How to Replace a Bike Bottom Bracket
Quick Answer
Remove the cranks, use a bottom bracket tool to remove the old unit, and install the new one with grease.
How to troubleshoot How to Replace a Bike Bottom Bracket
A worn bottom bracket causes creaking and rough pedalling. This guide covers removing and installing a new bottom bracket.
Step-by-Step Fix
- Remove the cranks using a crank puller tool.
- Use a bottom bracket tool to remove the old bottom bracket.
- Clean the threads in the frame.
- Apply grease to the threads of the new bottom bracket.
- Thread the new bottom bracket in by hand, then tighten with the tool.
- Install the cranks and torque to the correct specification.
Common Error Codes
| Code | Meaning | Resolution |
|---|---|---|
| Creaking noise | Bottom bracket loose or worn | Tighten or replace the bottom bracket. |
| Pedals feel rough | Bearings worn | Replace the bottom bracket. |
Frequently Asked Questions
How long does a bottom bracket last?
5000-10000 miles, depending on riding conditions.
Can I service a sealed bottom bracket?
No, sealed bottom brackets must be replaced.