This job might not be for everyone, but it's certainly not impossible! When in doubt: ask a local bike shop to do it for you.
I can recommend replacing old style open bearings for a cartridge system.
What you need:
- How to Remove a Bottom Bracket on a Vintage Bike
Removing the bottom bracket on a vintage bike can be a rewarding project, giving you insight into the heart of your bicycle’s drivetrain. Whether you're restoring a classic ride or performing routine maintenance, here’s a step-by-step guide to help you through the process.
- Tools and Materials You'll Need
Before you start, make sure you have the necessary tools:
- Bottom bracket removal tool (appropriate for your bottom bracket type)
- Adjustable wrench
- Crank puller
- Hex keys or Allen wrenches
- Grease
- Rags or paper towels
- Rubber mallet (optional)
- Step-by-Step Guide
- Remove the Cranks
Start by taking off the cranks. Depending on your bike, you may need a crank puller.
1. Remove the Dust Caps If your cranks have dust caps, use a hex key or flathead screwdriver to remove them.
2. Loosen the Crank Bolts: Use a hex key or appropriate socket to loosen and remove the crank bolts.
3. Use the Crank Puller* Thread the crank puller into the crank arm. Ensure it’s fully threaded before using the tool to pull the crank off the spindle. Repeat on the other side.
2. Identify the Bottom Bracket Type
Vintage bikes can have various bottom bracket types, such as:
-Cup and Cone Common in older bikes, characterized by cups and adjustable cones.
-Cartridge A more modern style found in some vintage bikes, where the bottom bracket is a sealed unit.
3. Remove the Bottom Bracket
For Cup and Cone Bottom Brackets
1. Remove the Lock ring: Use a lock ring spanner or an adjustable wrench to remove the lock ring on the non-drive side.
2. Unscrew the Adjustable Cup: After the lock ring is off, use a bottom bracket tool or adjustable wrench to unscrew the adjustable cup. Turn counterclockwise to remove.
3. Remove the Bearings: Carefully remove the bearings. It’s a good idea to place a rag underneath to catch any loose bearings.
4. Remove the Fixed Cup: On the drive side, use a bottom bracket tool to unscrew the fixed cup. Turn counterclockwise.
For Cartridge Bottom Brackets
1. Remove the Non-Drive Side: Insert the bottom bracket tool into the non-drive side cup and turn counterclockwise to unscrew.
2. Remove the Drive Side: Repeat on the drive side. Some cartridge bottom brackets may unscrew clockwise on the drive side, so check the markings on the bottom bracket. THIS MEANS RIGHTY LOOSY LEFTY TIGHTY!!
4. Clean and Inspect
Once the bottom bracket is out, take the time to clean the shell and inspect for any damage. Use a rag to wipe out any old grease and dirt.
5. Grease and Install New Bottom Bracket
If you’re replacing the bottom bracket, apply fresh grease to the threads in the bottom bracket shell. Install the new bottom bracket by reversing the removal process:
- For cup and cone, insert the fixed cup first, followed by the bearings, adjustable cup, and lock ring.
- For cartridge, insert and tighten the drive side first, then the non-drive side.
Vintage bikes can have unique quirks. Check any available manuals or online resources specific to your bike’s make and model.
Proper Tools: Using the correct tools is crucial to avoid damaging your bike.
Removing a bottom bracket on a vintage bike may seem daunting, but with patience and the right approach, it’s a task any bike enthusiast can accomplish. Happy wrenching!