I don't have much in the way of all-else-equal comparisons between wide wheels and narrow wheels but, if you will, consider the case of tires, where currently the unending chorus of advice in triathlon and bike racing circles is that "on the new wide rims, 23mm or even 25mm tires are fastest"

So, consider the Zipp 303, Zipp's widest rim currently, compare the 4000S 23mm vs 25mm:



The 22mm attack, faster still at yaws under 12deg (which liks 95%+ of the yaws you will see)



Or some of Coggan's field test comparing older narrow wheels at low yaw, and narrow tires at low yaw:

http://www.trainingandracingwithapowermeter.com/...s-skinny-vs-fat.html

Now, for crit racing and some road racing where a lot of time is spent in the draft when CRR is still fully on but aero is discounted, and cornering is a big deal, then maaaaybe this wide stuff is the faster option.

But for triathlon, time trials? as a front wheel especially?

going wider than the zipp 404/808fc is probably crazy beans.

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Kat Hunter reports on the San Dimas Stage Race from inside the GC winning team
Aeroweenie.com -Compendium of Aero Data and Knowledge
Freelance sports & outdoors writer Kathryn Hunter