Small flange hubs have the advantage of being a little lighter, but as the flange gets smaller, your choices of lacing patterns and spoke number drop off, when the spokes and heads start to interfere with adjacent spokes. The Hub flange is referred to as having a "small" (low) or a "large" (high) flange. It is the thin area that rises off the ends of the hub. The hub flange is the part of the hub that the spokes actually pass through. The three-piece type has a separate center or "core" tube with, what is generally, an aluminum alloy flange that has been pressed onto it (Nuke Proof, and Bullseye for example). Into the aluminum hub shell a bearing cup race or bearing cartridge is pressed on each side. The one-piece style uses a single aluminum forging, a single piece of machined billet aluminum to form the core of the hub itself. Hubs are usually made using a one-piece or a three-piece designed hub shell. It's for this reason that the hub descriptions are so lengthy, our apologies, but over educating has never been found punishable. Not an inch is traveled on a bike without the hubs revolving, and this is an area of the bike where quality improvement can be noticed. Hubs are another of the primary weight bearing component.
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