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Take care if you decide to do this. It isn't necessarily as straightforward as it might seem.
As I'm currently 'in negotiations' over a dispute with a major retailer, PM me if you want to know the details.
FWIW the Alfine chainset has a steel (Unlike Ultegra / DA aluminium) spindle.
I guess you get what you pay for.....
So the weight savings may be less than expected - I'll post the numbers once all the components have been delivered.
RE: External BB cranks...