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bukietowa
@Scilly.Suffolk
7400 is a road groupset, not track.
1) 112mm is the correct length for 7400 cranks fitted to British shells (113mm for Italian). But if the cups are stamped NJS, they aren't 7400 (which isn't to say they won't work with the spindle).
2) This is a track BB, but isn't 7400.