Kappius Components, the little father/son brand that emerged around Sea Otter with their custom cassettes mated to a larger axle hub, has updated the design to use angular contact bearings. This mod lets you quickly and easily remove any play in the hub. Brady Kappius says they also offer longer life because all of the balls in the bearing are in contact at all times rather than resting on only a few with cartridge bearings.
We were worried SRAM’s XX1 introduction might diminish demand for their design (which you can check out in full detail here), but our fears are quieted a bit after they told us they’re actually having to move production overseas to meed demand. Right now, Russ Kappius can’t make them fast enough, so they’re are taking preorders for the new design and should start shipping in spring 2013.