Bicycle Mechanics - Bottom bracket exploded!
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09-22-08, 07:37 PM
I did a stupid thing and decided to continue riding with a corroded bb and now I'm paying the price. The fixed cup was cut up by the shards of disintegrated bearing retainer. I cleaned it out and hoped packing enough grease into all the gashes would smooth out the spinning, but unfortunately what I should have been worried about was the weakness in the scratched up cup. After attempting a wheelie (an even dumber move) the face of the cup popped off leaving the threaded "sleeve" in the bb shell. Since I haven't had a chance to pull the cranks off I'm not sure hot hard it will be to extract that left-over threaded bit but I imagine it will be a pain if not impossible. Has anything like this happened to any of you (although I'm sure you're all smarter and not as cheap as me) or do you have any tips on how to remove this bit with the least risk of damaging the interior of the frame. If this a futile endeavor, I don't mind. It's a cheap commuter and I wouldn't mind having an excuse to buy a new bike to replace it.
09-22-08, 07:43 PM
Assuming it isn't seized on there for good you can destructively remove it with a dremel or what not. Just depends how much time and effort you want to spend into it.
If you just grind a notch in one spot you can probably use a screwdriver and a hammer to rotate it a little at a time. Lots of light blows, and make sure you are driving it the correct direction (RH vs. LH thread) Also don't use a good screwdriver, as this is likely to ruin it for anything but opening paint cans and dipping grease.
09-23-08, 03:41 PM
This sounds doable. I'll give a try and let you know what happens. Thanks for the tips.
09-24-08, 04:44 PM
buy the ticket, take the ride. i guess. good luck on the rebuild and plan on replacing... a lot.
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