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Campy Chorus BB cups, Dura-Ace Spindle - Compatible?

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Campy Chorus BB cups, Dura-Ace Spindle - Compatible?

Old 08-25-10, 04:17 PM
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Campy Chorus BB cups, Dura-Ace Spindle - Compatible?

I am considering building up my late-80s Park Pre with a Dura Ace 7400 drivetrain. I currently have a circa '88 Campy Chorus BB installed, and plan to purchase a set of Dura-Ace 7400/7401 cranks. I've followed various discussions about compatibility of spindle tapers and understand (or think I understand) that the Dura-Ace cranks will not work with the late 80s Chorus spindle. However, I see a 7400 Dura-Ace spindle in my correct size currently available on ebay, and I wonder if I might be able to use that spindle with the existing Chorus BB cups & bearings?

Oh, one more question: What type of chain should I be looking for to go with a 7-speed Dura-Ace freewheel and 7401 RD.

Thanks in advance for your advice.
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Old 08-26-10, 11:41 AM
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No replies yet, so I'm giving this a bump by adding additional, somewhat related questions. Unless someone can confirm that a Dura-Ace spindle will definitely work with Campy chorus BB cups, I'm going to assume it will not.

In my search for a complete BB, I notice that the Dura-Ace 7410 BB has a spindle length of 103mm, versus the 111mm Campy bottom brackets I've used in the past and 112mm spindles for Dura-Ace 7400 series. Why are the 7410 spindles so much shorter? Is this to accommodate 8-speed setup and different chainline for 130mm rear dropout spacing? Would a shorter spindle 7410 BB & crankset work with a 7-speed setup and 126mm rear dropout spacing? With the shorter 7410 spindle, will the crank clearance around the bottom bracket be an issue?
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Old 08-26-10, 11:48 AM
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Mix 'n match: You'll need to consider the size of the hole in the cups and the distance between the flanges on the spindle. So get out your calipers is all I can help with.

7410: yes, it required a shorter spindle. The chainline is the same 7s & 8s, so it's just the difference in the manufacture of the 740x vs the 7410 series. So you can use the 7410 crank & BB with your frame, but do not try to mix and match 7410 cranks & BB 740x series.
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