Cervelo Cervelo S2 2009 Frameset at the Tristore.com

The S2 already has the reputation for being the ultimate pro bike; not surprising, given its long list of victories. But how about comfort? Truth be told, many frames with aero tubing lack in comfort. But Cervélo have been designing aero bikes since their inception, so they have the most experience in building aero frames without sacrificing the traditional focal points of weight, stiffness, strength and comfort.

UPGRADES FROM S1
Lighter frame - The S1 is very competitive in weight even compared to frames without an aero advantage.
Higher bottom bracket and torsional stiffness - While even the biggest pro riders have no complaints about the S1 stiffness, the S2s additional torsional stiffness make it track through switchbacks in fast descents even better.