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Can Italian Threaded BB have 68mm Spindle?

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Can Italian Threaded BB have 68mm Spindle?

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Old 10-09-15, 05:51 PM
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bikefhealth
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Can Italian Threaded BB have 68mm Spindle?

New to mechanics. Try to overhaul old Road bike's bottom bracket that I got from an auction site. The cup of has a stamp 36X24T on it, which base on information on the web is italian threaded, right? But when I pull a spindle out, it stamp 68 = W = 113, D-3H. Is this possible?
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Old 10-09-15, 06:00 PM
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68mm is the width of your frame BB. The 113 is probably the spindle length. If it's 68mm it is English.
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Old 10-09-15, 06:25 PM
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If the shell was 68mm wide and the cups were matched to the spindle then all would be at peace. But different widths between the spindle's bearing tracks for the same shell width do exist. As does the cups having different wall thicknesses. So a number of combos are possible that might not be OEM but still might work.

your set up must be possible as that's what you took out. I think the real questions are along the lines of did it all work with the crank set and frame? What would a replacement best be? Andy.
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Old 10-09-15, 06:26 PM
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Someone could have stuck a spindle meant for an English-threaded bike into Italian-threaded frame and cups. There's no law against it.

There was a brief period of time when some Asian-made bikes were coming over with English-threaded 70mm BB shells, so a "5"-type spindle (55mm center section rather than 52mm) was needed to make everything work. And it did.
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Old 10-09-15, 06:27 PM
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I wonder which dup thread will catch on?

Another possibility is that the bike was a 1.37"x24tpi originally but then was retapped to 36x24 for some reason (like a stripped thread). Or that the shell was faced down at some time by 2mm. Andy.
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Old 10-09-15, 08:28 PM
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Sure. It could even have a 65mm spindle. Shell thread is only loosely correlated with shell width.
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Old 10-09-15, 10:33 PM
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Originally Posted by Andrew R Stewart View Post
I wonder which dup thread will catch on?

Another possibility is that the bike was a 1.37"x24tpi originally but then was retapped to 36x24 for some reason (like a stripped thread). Or that the shell was faced down at some time by 2mm. Andy.
merged the two threads.

The re-tapping idea is really interesting. I've heard of putting a sleeve in, but I guess you can just go ahead and use Italian cups
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Old 10-13-15, 10:14 AM
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Thanks for all recommendation.
I measure the shell this morning and it came out between 69-69.5 (two different ruler.) Will try with the 70mm spindle.
Thanks
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Old 10-13-15, 12:32 PM
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Its more the spread of the inner races that are part of the loose ball type spindle ..

BITD Campag had 2 different thicknesses of cups *, the thicker one was Spiral impressed to have particles be ejected as the cranks Turned.
in both the BB set sold to builders in Italy and England.. so bearing race was wider or narrower spread on their various axles ..

*between the outer cup race and the outside Face of the part.
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