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I hear the aero argument but question its real world benefit. If you are 5'6" tall and built like an 8 year old boy with add (i.e. scrawny little f@cker) maybe it's worth it. I can tell you it would make little difference to me - reduced frontal area? I wear a size 48 jacket and my quads are the size of Hoy's, my arms are the size of some of the climber's quads on this forum, does an aerodynamic frame truly make a difference? Probably a little for regular road riding. For TT's absolutely as you need every advantage for the race of truth.