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Suggestions for a lush six bolt and matching non-disc front
Novatec, although it's hard to see why the front hub should look anything like the rear given the very different jobs they have to do. What I actually have in service is Shimano M758 rear paired with T780 front, and what I have in the works is Mavic Crossride paired with Aksium, with a longer term plan to put nice rims on them.
DuraAce have no seals, terrible idea for road use unless you can guarantee that they'll never see any rain.
I'm never building another fixed rear that isn't 6-bolt, all the cool kids are using big rings these days so the 16T minimum isn't even a problem for racing. Custom axles should be #buyer enough for anybody :)