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Old 10-16-09, 08:33 PM   #1
schwimanno
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bottom bracket help

i am wanting to install shimano 105 5600 components on my '63 schwinn varsity. the only problem i can see would be the bottom bracket, so my question is: can a shimano 105 FC-5600 bottom bracket be installed on a '63 schwinn varsity? Or can the shimano chain rings be put on the schwinn crank arms?
thanks for your time.
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Old 10-16-09, 08:50 PM   #2
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What is the current crank and bottom bracket? If it's a one-piece (Ashtabula) crank, you will need specific adapters to install a standard English threaded bb.
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Old 10-16-09, 09:32 PM   #3
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it's the original/stock crank and bottom bracket. both crank arms are one piece.
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Old 10-17-09, 12:06 AM   #4
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Originally Posted by schwimanno View Post
it's the original/stock crank and bottom bracket. both crank arms are one piece.
In order to mount the Shimano cranks, you'll need a set of adapter rings:
http://www.jensonusa.com/store/produ...rsion+Kit.aspx ,

Also, the Schwinn seat tube is 1" diameter, so you'll have to shim for the front derailleur and then figure out how to run the cables. You'll need a derailleur claw to mount the rear derailleur. The 105 brake calipers will be much too short, so longer calipers are needed: http://sheldonbrown.com/harris/brake...ers.html#55-73

The question is- how far do you want to go with this?
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Old 10-17-09, 01:17 AM   #5
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Yeah, need some way to mount the shifter cable-stops as well. Perhaps a clamp-on downtube cable-stop with adjusters.
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Old 10-17-09, 07:48 AM   #6
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The question is- how far do you want to go with this?
That's an excellent question. Your "problems" extend far beyond just fitting the bottom bracket. 10-speed index shifting is pretty intolerant of frame and derailleur mis-alignment. A claw-mount rear derailleur is unlikely to be precise enough to make it work properly as well as the other mis-matches Jeff and Danno already mentioned. This is going to be a very expensive, and probably frustrating, project.

The cliché that includes the terms "silk purse" and "sow's ear" comes to mind. Unless you have great sentimental attachment to this frame, you would be well advised to start with something much more up to date.
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Old 10-17-09, 08:04 AM   #7
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hillrider you took the words out of my mouth but I was not going to so tactful. for what he is likely to spend on that he can get a good used bike or even something entry level from BD

and for you who are unfamiliar with that crankset/bb it is an Ashtabula crank.

the front derailluer will still be an issue but you could get a BMX 'spider' to go on that crank then put chainrings on that. however to have a double would require lots of spacers and things.
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