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Bianchi BB woes

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Old 10-10-15, 12:20 PM
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2fat2go
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Bianchi BB woes

I have a Bianchi Giro SLX 60cm late eighties. it came with a Campy Chorus Group. the cranks are 165 (go figure, Italians) anyway I have some Super Record cranks that i could use but I can't seem to find a bottom bracket that will give me enough chainstay clearance with the SR Cranks. I guess I could get a longer Chorus Crankset and use the Chorus BB that I have but I would rather get the SR Cranks to work. Any suggestions would be appreciated.
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Old 10-10-15, 12:47 PM
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The solution is very simple. You want to mount SR cranks, so there's no reason to limit yourself to a Campy BB. Once you determine whether you have an Italian 36mm, or BSC 1.37" (about 35mm) threaded BB shell, you can shop for any square taper bottom bracket. There's a large selection of spindle lengths in various qualities in BSC, and a decent though more limited selection in Italian.

If you don't know which thread you have, the first step is to check markings on the existing BB cups. Next the width of the shell is a decent clue, Italian are 70mm wide, BSC is 68mm. Also BB right side cups have a left hand thread, and lastly you can measure the OD of the left cup Italian will be 36mm, BSC just under 35mm.

Good luck
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Old 10-10-15, 12:56 PM
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Phil Wood makes up BBs with old type and Current ISO taper, the New ones can even be offset altered as the axles are not shouldered but smooth.

Bianchi USA began getting bikes Built for them by Asian factories long ago
that is why a lot have the British/Asian thread pattern BB.

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Old 10-10-15, 02:43 PM
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Originally Posted by 2fat2go View Post
I have a Bianchi Giro SLX 60cm late eighties. it came with a Campy Chorus Group. the cranks are 165 (go figure, Italians) anyway I have some Super Record cranks that i could use but I can't seem to find a bottom bracket that will give me enough chainstay clearance with the SR Cranks. I guess I could get a longer Chorus Crankset and use the Chorus BB that I have but I would rather get the SR Cranks to work. Any suggestions would be appreciated.
If you're trying to mount a vintage Super Record crank on a Chorus bottom bracket, be aware that the Super Record crank needs to be mounted on an asymmetrical spindle but the Chorus spindle is symmetrical, putting the SR crank too close to the frame. Assuming this is a 1st generation, non-cartridge Chorus bottom bracket, a 70-SS Gran Sport or Record (not Nuovo Record) spindle should provide the needed clearance using the existing Chorus cups.
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