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@kilgore_trout
regarding the whole riser/raised stem thing - most people who are in the market for pursuit bikes these days either buy older 'funny' bikes with sloping tubes that takes a 700-650 or a 700-24 mix of wheels or buy some of the 700-700 production bikes (like geekhouse or affinity http://www.affinitycycles.com/ - though i've never ridden on the affinity one before).
personally, i'd throw tt bullhorns on a pursuit bike if i wanted it, but most people are looking for something moderately comfortable and not using a pursuit bike for it's intended purpose
also, uci has banned using 2 different size wheels, and i think the physics of it was proved wrong - that having a 650c wheel in the front has more rolling resistance which negates the aero-ness you would have by having a lower front end.