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If you read the white paper basically the only improvements on the S5 came from the handlebars. Not to mention they did the wind tunnel tests with different wheels...
As for no integrated bars on Movistar's bikes, i think that's largely down to the nodderesque sizes of stem supplied in the aerobars. A 10 / 11cm stem on a size 54 / 56 is just wrong for most racers who want long and low.
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As I understand it Cervelo used to spec Budget Wheels. So you could buy Your own aero Wheels to suit Your use, and have some training Wheels. Which makes sense. But fecked With the numbers for the Complete bike as spec'd. So for 2015 they added some Nice HED Wheels. Upping the price of the bike. But improving the published stats.
No Integrated aero drop bars :(
Those were my favourate bit of the Whole bike. Cervelo made their aero improvements on the S5 With some silly looking handlebars*. So maybe they're more for the tunnel and buyers. I do like them though. Cool compartments for Your cables and DI2 Junction. Very neat.
(*IMHO increasing tyre clearance and front end stiffnes while maintaining the much the same Aeros was good work. But I Guess the numbers need to look good)