need advice: Dura Ace 7400 NJS bottom bracket

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Scilly.Suffolk in reply to @bukietowa

Indeed they do! Which is confusing...

I can't find a 7600 BB: perhaps Shimano reused the 7400 BB cups for the 7600 cranks (which use 109mm BB), hence the need for an NJS mark?

Perhaps all 7400 cups were then marked NJS, so both the track (109mm) and later road (112mm) versions of the BB had NJS cups?

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bukietowa in reply to @Scilly.Suffolk

You have made a good point! Another puzzzle, here you have bb with 7400 NJS cups and 7600 NJS spindle... I wonder if this set is exactly how it was packed in the factory or it was the seller who mixed 7400 cups with 7600 spindle.

http://www.ebay.fr/itm/Dura-Ace-BB7400-Track-English-Threads-68mm-109mm-Square-Taper-Bottom-Bracket-JIS-/282092266567?hash=item41ae026447:g:9JwAAOSwQjNW95sJ

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Scilly.Suffolk in reply to @bukietowa

I think this bears out my theory that Shimano used 7400 cups to create a BB for the 7600 cranks.

If you search for "Shimano BB-7600", you won't find one (the later cartridge version is BB-7610).

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