Dilemma: 2015 S-Works fact 11r or 2018 fact 10r
Moderator: robbosmans
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When grams are used in the context of a wind tunnel data, they are actually referring to gram-force, a non standard unit, which is giving mass times gravitational acceleration, as opposed to mere mass. They do this because most people understand weights pretty well, but don't understand direct measurement of force or mass as intuitively. So you are really referring to a change in force on the bike when you are talking about grams of drag. Gains made from aerodynamics apply at all speeds, although proportionally greater as speeds increases, while gains made from grams in terms of mass of the bike only matter while climbing, or a very small amount in acceleration (if you do the math its almost insignificant compared to the drag forces).
I have an SL6 Tarmac in both Expert/Fact10 and S-Works, an SL5 disc Expert/Fact10 and have just sold mt SL5 S-Works. If an SL6 S-Works isnt an option I would pick the SL5 S-Works over the SL6 Expert. While is is hard to explain the difference in lay up or carbon whichever it is a definite difference in ride quality between the S-Works models and the Experts. When you're riding the bikes day to day I can't say I notice the couple of hundred gram difference between bikes but you can instantly feel the difference between the Expert and the S-Works as soon as you roll out. It should come down to what you prefer and which is the biggest priority for you but if it was my choice that's where I'd go.