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Dura Ace BB 7400 Compatibility Question!

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Dura Ace BB 7400 Compatibility Question!

Old 10-23-15, 07:41 PM
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Dura Ace BB 7400 Compatibility Question!

Hello! This is my first post on bikeforums. I'm wondering if one of y'all may be able to offer advice. I have a Dura Ace 7400 bottom bracket spindle, and I have the 7402 crankset.

However, I don't have the bearings or cups for the bottom bracket. The spindle is marked '70' which I take to mean that it is built for an italian bottom bracket shell. So, I need cups in that size and thread pitch. But is there anything else I need to worry about in terms of compatibility? Are there certain bearings and cups that this spindle will not turn smoothly with?

If so, do you have any advice on identifying compatible stuff?

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Old 10-23-15, 08:50 PM
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A few points- IIRC this BB is a tapered square crank/spindle with 11x1/4" balls per side. "70" is quite likely the BB shell width. But only 1mm per side of the BB cup/shell. not too much to deal with a spacer. Cups were made in a thin wall and a thick wall. "Wall" being the thickness of the cup's face, thick walled cups sometimes have seals or rifling. Thin walls were usually common to lower cost BBs. The 7402 was likely a thick wall cup set. Andy.
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