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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 09-14-08, 03:02 PM   #1
Thumpic 
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What is this from a Schwinn BB? pic

I found this in the bb...is it just to hold the bearings during assembly???

thanks..........
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Old 09-14-08, 03:36 PM   #2
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I think that it's to keep water out the bearings and tubes, or to keep rust out of the bearings. All the mid to high quality cup and cone bottom brackets that I have taken apart have had one.
A mountain bike that had rusted a lot on the inside had a pile of rust on that plastic piece and it kept that rust from getting in the grease of the bearings.
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Old 09-14-08, 03:37 PM   #3
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Many older better bottom brackets had that part. It goes over the spindle between the bearings and races. Keeps the water from washing out the bearing grease. Roger
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Old 09-14-08, 09:11 PM   #4
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Keeps the water from washing out the bearing grease. Roger
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I think that it's to keep water out the bearings and tubes, or to keep rust out of the bearings..............
in this instance...it didn't work........but thanks for the responses......................
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Old 09-16-08, 11:11 AM   #5
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Is there a hole in the hanger tube to drain it?
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Old 09-16-08, 03:01 PM   #6
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they rarely worked, but better than not having one....when overhauling a BB I used to slather grease all inside (after cleaning out the old grease residue)
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Old 09-16-08, 03:14 PM   #7
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Hehe- I once found a dead wasp in the BB shell....
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Old 09-16-08, 03:22 PM   #8
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These were not perfect seals but they did help a great deal for bottom brackets that had cutouts.
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