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Clockwise
JWestland
Noticeably so, can be further improved by having a decent carbon seatpost.
The new 2016 Cannondale SuperSix now come with a 25.4mm seatpost, the previous Supersix have 27.2, further back to 2013, it used to have a whopping 31.6mm.
Oversized = stiffness usually, useful for frame, bar, stem etc. but with seatpost, you don't want to feel every small vibration travelling up your backside.