There is indeed a difference in the frames. SW Model uses a carbon layup that is around 150g lighter than the Pro/Expert/Comp frame. Stiffness testing in the lab showed very little difference in the overall stiffness between frames. Sine there is so much carbon being used, both frames are extremely laterally rigid, absolutely no need to fret losing power from frame or BB flex.
Another very notable change in spec from the Pro to the Exper/Comp bikes is the carbon aerobar shared by the SW/Pro bike and the Alloy bar shared by the Expert/Comp bikes. Both bars offer an enormous range of adjustment allowing the fitter to raise the armpad and extension 50mm in 5mm increments. Additionally, the armpads can be placed so they are anywhere fore/aft on the extension and can be moved 9cm in width adjustment.
The Carbon bar comes with an integrated aero stem allowing for adjustment of a 60mm or 90mm stem with the adjustment of a small wedge while the allow bar uses a standard stem.
Hope that answers the question, sorry for the delay odin99!
The weight savings are the biggest thing. The SW Frame is around 1/2lb lighter than the pro frame. When designing the layup (order in which the different sheets of carbon are applied) the SW frame is able to use higher modulus, stiffer fibers that tend to cost more cash. The pro frame has similar stiffness but needs to use more sheets of less stiff carbon to achieve the same ride characteristics. As a result the thin wall tubes of the SW frame tend to flex more and provide a slightly smoother ride than what you will find in the pro frame.
ha, not that anyone is saying a deep section aero tube rides smooth!!! if you really want a smooth ride go throw your leg over a Roubaix!!!
sorry if i'm misinterpreting something, but there seems to be a conflict in your statements here Chris - 1/2lb is 450g which is quite a bit more than 150g!
what is the actual typical weight difference between s-works and pro framesets - in medium size?