ganbatte!
Join Date: Aug 2004
Location: nyc
Posts: 1,648
Bikes: '06 Vanilla touring, '09 Vanilla cx, Zanconato cx, Moots Psychlo-X RSL prototype, Nagasawa track, Kalavinka track, Black Cat 29er, Cannondale Rize 2 26er, Serotta CRL Legend
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As a side note, Zipp hubs use ZZ (dual shielded) bearings to eliminate seal drag. Phils, you'll notice, are pretty stiff to turn when not installed on a wheel. That can be attributed to seal drag. In theory, you could run a 6000ZZ bearing and potentially get some energy savings over a 2RS (at the expense of most likely having to replace the bearings more frequently due to contamination) but I expect most people will prefer the sealing to the decreased friction.