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in need of a 1.37 x 24t Italian thread bottom bracket... am i crazy??

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in need of a 1.37 x 24t Italian thread bottom bracket... am i crazy??

Old 06-27-14, 12:20 AM
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fimy
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in need of a 1.37 x 24t Italian thread bottom bracket... am i crazy??

OK so I'm building a 91-ish Bianchi SLX from the frameset up. I ordered an Italian thread 70mm bottom bracket, only to find that it was too wide for the bb shell (36x24). I currently have a used Suntour 1.37x24t bb in there, found at a local non-profit bike shop, but the problem is that the spindle is too long and my front derailleur isn't working with it. I've been trying to find a 1.37x24t 70x111mm bottom bracket, but I can't find anything because it seems that 36x24 is the Italian size that should correspond with the 70mm length and clockwise threading, so now I just feel crazy. Help me out please!
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Old 06-27-14, 07:13 AM
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Don't sweat the width on a cartridge style BB. The non drive side may just "disappear" a little into the shell. The threading is what's important, and if you've found that it's English threaded, then look for an English threaded cartridge BB that's the right one for your crankset. You didn't mention what crank you're using, and that's an important consideration.

But your title "1.37x24 Italian threaded" is like saying 1=2. The width may be Italian, but the threading can't be both English & Italian.
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Old 06-27-14, 08:48 AM
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Are you sure you don't have a Japanese Bianchi frame? English, ISO, and Swiss threaded bottom brackets have left-threaded fixed cups, which would require you to cross-thread into a Italian BB shell.
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Old 06-28-14, 08:23 AM
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probably not a JP Bianchi if it actually has SLX tubing, but...this is one confused post so who knows? as ex=pres implies: there is no way you'd actually get a BSC fixed cup into an Italian BB shell, at least not without mammoth cross-threading...so clarify and post pictures, please.
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Old 06-28-14, 10:55 AM
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Originally Posted by unworthy1 View Post
there is no way you'd actually get a BSC fixed cup into an Italian BB shell, at least not without mammoth cross-threading.
No, a BSC cup is smaller diameter than an Italian shell and won't even engage the threads.
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Old 06-29-14, 12:27 AM
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Originally Posted by JohnDThompson View Post
No, a BSC cup is smaller diameter than an Italian shell and won't even engage the threads.
That's what i meant
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Old 07-07-14, 12:40 AM
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Thanks for the replies everyone. I am in fact crazy, and it turns out my frame is English thread--I got mixed up. Found the bracket I needed and it's working great.
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Old 07-07-14, 02:02 AM
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well glad it all worked out and if confusing a BSC for an Italian BB is as crazy as you get you have nothing to worry about.
Interesting to note that Bianchi was using BSC shell threading as early as you say (91-ish) as I thought they switched over much later than that, but I'm sure it was a gradual switch.
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Old 07-07-14, 02:26 PM
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That's partly why I was so thrown off, as I thought a Bianchi that early would be Italian standard. But the year is just a guess, as the person I bought it from didn't know for sure. I could be mistaken.
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Old 07-07-14, 02:33 PM
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Originally Posted by fimy View Post
OK so I'm building a 91-ish Bianchi SLX from the frameset up. I ordered an Italian thread 70mm bottom bracket, only to find that it was too wide for the bb shell (36x24). I currently have a used Suntour 1.37x24t bb in there, found at a local non-profit bike shop, but the problem is that the spindle is too long and my front derailleur isn't working with it. I've been trying to find a 1.37x24t 70x111mm bottom bracket, but I can't find anything because it seems that 36x24 is the Italian size that should correspond with the 70mm length and clockwise threading, so now I just feel crazy. Help me out please!
Bianchi switched to English BBs for most bikes coming to the US in '90is. I have to double check but I think even my '90 MAX frames are English
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Old 07-15-14, 12:37 PM
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Replaced the bb with a vintage Campy one, fits great. It's a little loose currently, but that's easily fixed.
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