One-Piece Crank Schwinn Super Sport Loose Cup?
06-17-17, 07:56 PM
#1
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One-Piece Crank Schwinn Super Sport Loose Cup?
Here's something new to me - the drive side bottom bracket cup sits somewhat loose in the frame. The non-drive side is tight and would need a hammer to knock it out, but the drive side I can just pull right out with my fingers. Has anyone had this - where you have a loose bottom bracket cup with a one-piece crank? When I first got the project, the bottom bracket turned OK; the cup was not turning in the frame. Once I loosened the set, it became apparent that the drive side cup sat somewhat loosely in the frame.
And I suppose the alternative to conversion is a thin shim of some kind to tighten the cup fit up just a bit. Maybe a piece of soda can or sheet aluminum?
What's the verdict? Should I do a bottom bracket conversion on it to modern three-piece? Or is this something people just deal with and ride?
And I suppose the alternative to conversion is a thin shim of some kind to tighten the cup fit up just a bit. Maybe a piece of soda can or sheet aluminum?
What's the verdict? Should I do a bottom bracket conversion on it to modern three-piece? Or is this something people just deal with and ride?
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06-17-17, 08:00 PM
#2
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I would try a different cup and if that didn't work then I'd shim it. Aluminum foil would probably work best. However if you want to do a 3-piece conversion then I would go that route.
06-17-17, 09:04 PM
#3
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Aluminum foil might be too thin. Try a soda can. Whatever works, I would trust it. These bearings are not precise.
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Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog
“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author
Please email me rather than PM'ing me. Thanks.
06-18-17, 01:20 PM
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06-18-17, 06:06 PM
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I have encountered this problem before on U.S. made Schwinn bikes. One side a bit loose, the other tight. After tightening the left hand cone and locknut, never had a problem with anything loosening up.
06-18-17, 06:46 PM
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06-19-17, 05:01 AM
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Assemble, ride...remember...these cranks were tanks...
And...loctite won't work so well on this...no threads to grip...
And...loctite won't work so well on this...no threads to grip...
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