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I wouldn't really take this seriously, I think is more something related to steerer flexibility, better shorter tube than taller.
@mdcc_tester can maybe has some ideas regarding this matter?HHSB thread tho...
Breso-
What’s going on with the riser bar, you’re probably wondering. To achieve the best aerodynamics, Specialized has developed the stem with a -17 degree rise and then offers two handlebars for the rider to get the desired fit, with the 25mm rise bar shown, or a flat option. What Specialized is attempting to do is force the rider into an aggressive and low position, to minimise drag caused by the rider. With the rider accounting for about 80 per cent of the overall air resistance, this makes a lot of sense - simply hunkering down on the bar makes a massive difference to the power output required to maintain any given speed.
from http://road.cc/content/news/155944-tour-de-france-bikes-2015-mark-cavendishs-specialized-venge
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some ideas regarding this matter?
The idea is the same one people had 30 years ago; make the head tube short and then join the grip portion of the bars to the top of the steerer with the shortest wing section possible. Look have the same idea with their track bar, it has 45mm less drop than a Cinelli 67 allowing the stem to be in line with the top tube for the aeros.
negaatio
gbj_tester
aero gains