Removing press fit bottom brackets requires specific tools and techniques to avoid damaging the frame. Here's a general overview based on the provided reference and general bike mechanic knowledge:
- Inspect the Bottom Bracket Shell: Before using any tool, carefully inspect the inside of the bottom bracket shell for any imperfections or damage.
- Use a Press Fit Bottom Bracket Removal Tool: A specialized tool designed to press out the bottom bracket cups is essential. One such tool mentioned (though the reference is cut off) is likely a WBT 90.3, specifically designed for bottom brackets with an inner diameter between 22 and 24 millimeters.
- Proper Tool Application: The removal tool typically works by inserting it through the bottom bracket shell and then expanding or applying pressure against the inner edges of the bearing cups. This forces the cups outward and away from the frame.
- Controlled Force: Apply steady, controlled force to remove the bottom bracket cups. Avoid excessive force, as this can damage the frame. Some tools use a hammer or a threaded puller to apply this force.
Important Considerations:
- Frame Material: Carbon fiber frames are more susceptible to damage than aluminum or steel frames. Use extra caution when removing press fit bottom brackets from carbon frames.
- Proper Fit: Ensure the removal tool is the correct size for the specific bottom bracket you are removing. Using the wrong tool can damage both the bottom bracket and the frame.
- Lubrication: Applying a penetrating lubricant to the interface between the bottom bracket cup and the frame can help ease removal.
- Professional Assistance: If you're not comfortable removing the bottom bracket yourself, it's best to take your bike to a qualified mechanic. They have the experience and tools to do the job safely and effectively.
