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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 07-26-07, 06:55 PM   #1
bfromcolo
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Help with ancient bottom bracket

I am trying to change out the one piece crank for a three piece one on an old Schwinn. How do I extract the original bearing cups from the bottom bracket? I have been beating on it but not getting anywhere. Thanks.
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Old 07-26-07, 07:38 PM   #2
Bob Dopolina 
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Old 07-26-07, 07:57 PM   #3
carpediemracing
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Hit the inside of the cups from the opposite side of the frame with something. Frame has to be stationary somehow.

I did this recently on a Schwinn "spin" bike and used a 2 lbs pry bar and hit it with a 3 lbs dead weight hammer. The cups flew across the room but they came out.

Wear gloves - the hand holding the pry bar was numb for a bit from the shock.

Good luck,
cdr
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Old 07-26-07, 10:00 PM   #4
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Originally Posted by carpediemracing View Post
Hit the inside of the cups from the opposite side of the frame with something. Frame has to be stationary somehow.

I did this recently on a Schwinn "spin" bike and used a 2 lbs pry bar and hit it with a 3 lbs dead weight hammer. The cups flew across the room but they came out.

Wear gloves - the hand holding the pry bar was numb for a bit from the shock.

Good luck,
cdr
Yes that did it. BIG socket on an extension and some beating with a rubber mallet from the other end eventually did it. I have a bike stand I got at a yard sale for $5 and it sliped a couple times but perseverance paid off in the end.
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