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Bottom bracket spindle width, old Fuji Sugino cranks

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Bottom bracket spindle width, old Fuji Sugino cranks

Old 08-31-11, 09:32 PM
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gerv 
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Bottom bracket spindle width, old Fuji Sugino cranks

I'm moving my 1982 Fuji Supreme parts to a new frame. Because the new frame no longer has the fixed BB cup, I'm buying a new Shimano UN-54 or 26.

When I took the old spindle out to measure it, I got a width of 124mm from the ends of the taper.

I thought that was pretty strange considering the crank is a double (52, 42).

I was expecting something in the range of 113 to 118.

Should I just go ahead and get the new BB in a width of 124? (Actually I think the closest is 122)
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Old 09-01-11, 05:57 AM
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Mr IGH
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It's probably asymmetrical (drive side is longer than the non-drive side). If that's the case a 127mm might fit better.
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Old 09-01-11, 08:09 AM
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Good point. It isn't symmetrical.
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Old 09-01-11, 05:54 PM
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There is likely a code stamped on the spindle, probably starting with a 3. Either find that code, and look up (There's a table on Sheldon's site, I know) the difference between the long and the short side, and figure out how long a symmetrical spindle you need; or, measure the difference and work it out. (Alternative three: buy a new crank, and use the bottom bracket specified. Modern chainwheel dentistry produces cranks that shift an awful lot better than they used to, even with old derailleurs and shifters.) I say this because different spindles were differently asymmetrical, and a 127 might not be long enough; some are just 1 mm different, but the range goes to 7 or 8 mm. If you've got one like that, you need a 133, which i don't know you can get, in which case, you're looking at finding some new cups or a new crank.
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