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Crescent bikes BB threads

Old 03-07-12, 04:13 PM
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Crescent bikes BB threads

A friend has an old Crescent frame she wants me to "bring it back to life" in the coming months. It was her first ever "real" bike and she wants to give it to her daughter as a gift in the next year. The question I have is, before I start to tear it down, what is the bb threading on a Crescent? Is it english/italian or what? I've searched around and haven't found any info that's helpful on something that specific.
It's the classic orange bike with blk/wht checks and 531 tubing.

Any help is greatly appreciated.

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Old 03-07-12, 06:49 PM
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It won't be Italian.

If it has right-hand threading on both cups, then it would definitely be French.

If it's got left-hand threading on the drive-side cup, then you can test-fit some old bb cup or cartridge from a Fuji or whatever.
Then, if it (English cup) only goes easily in one or two turns, it means it's Swiss-threaded.

On my Swiss-threaded 1980 PX10, I used care, some lube and an 18" wrench to work an English-threaded, alloy-cupped Shimano UN7* cartridge into it. It took at least ten minutes each side, but the bb shell did carve those BSA alloy cups into Swiss-threaded cups that then torqued down with a good bottoming feel. I had to move the wrench back and forth for each 1/4 turn that I advenced the cup, and had to really hold the wrench so as to prevent a nice new Park spline tool from slipping under the high torque.
I am nearly certain however, that it will be the very last BB work that is ever needed on that bike.
I chose a 113mm spindle to replace the Stronglight 118, thus compensating for the ISO-JIS taper conversion.
A 115mm would have been just as good, oweing to the Stronglight spindle having had a slight rightward offset (which the Shimano cartridge did not) but my preference typically is for a slightly shorter drive-side spindle when possible.
I must admit that the front derailer spring now seems to downshift with noticeably less authority than before, but still getting the job done 99% of the time.

Lastly, one warning: The flange on those Shimano alloy-cup bb's will break off if you torque too heavily after it bottoms "home". Might make removal difficult because it takes about half of the spline's width with it(!), but also leaves you with a fully-adjustable chainline with the flange out of the way.

Last edited by dddd; 03-07-12 at 07:02 PM. Reason: ...
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Old 03-07-12, 08:16 PM
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Would you post a pic of it? My dad had an Orange Crescent when I was a boy, I remember it and my rides with him, fondly.

There are also threadless BBs, e.g. Veloorange makes one.
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Old 03-07-12, 08:20 PM
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I have a 72' that is french. I think most if not all of the orange ones are french. BF member javal will know. Hopefully he will check in.
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