Join Date: Dec 2010
Location: Long Beach, CA
Bikes: Specialized Tarmac, S-Work Epic, Cannondale F29er, Intense ProXXL Cruiser, Electra Cruiser 1
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I've replaced the bearings on an ISIS bottom bracket without anything more special then a deep socket 31mm socket. The rings by the spines on the ISIS bottom bracket is what keeps everything together. Bearings can be order from http://www.enduroforkseals.com/id233.html
1. Remove adjustable cup.
2. Hold the bottom bracket in one hand by the body with the fix cup facing down. With a hammer hit the spindle. This will take some force and a few hits but nothing to crazy. This will remove the top ring, the fix cup and bearing on the fix cup side and the spindle.
3. Place the spindle back into the body of the bb and tap out the other bearing.
1. Place a new bearing on the fixed cup side of the body. Place an old bearing on top of it and tap the new bearing into the body of the bb. It is important to protect the new bearing with the old bearings. Tapping the new bearing directly can cause damage to the bearing.
2. Insert the spindle into the bb though the new bearing so the ring remaining is on the outside.
3. Place the other new bearing onto the other side, place the old bearing on top of that and with a 31mm socket placed over the spindle tap the bearing into place. To clarify this step. After stacking the two bearings on top of each other, place the socket so it slides over the spindle. Rest the bb on a vise so the already installed bearing are resting visa and the spindle passes through. Tap on the socket until the new bearing is pressed into the bb body.
4. Place the ring on the spindle with the old bearing on top of it and the socket again top of the old bearing. Rest the bb on your workbench and tap the socket until the ring is pressed on.
5. Tap the fix cup on using the socket.
Done! When I first did this I thought about taking picture of the process. Picture are worth a thousand words. Let me know if anything isn't clear and I will try to clarify. After doing this the first time I was surprised how easy it was and that it's generally encouraged to dispose of the bb and replace it with a new one.
Last edited by velorider562; 02-13-12 at 01:20 AM.