2011 Specialized Tarmac SL3

Although the  2011 Tarmac SL3 doesn't come with Zertz inserts, it has a triangulated seat for stiffness and the geometry is aggressive. You can expect more confidence, better handling, and better power transfer from these features.

The key to stiffness is a bigger cross section in the fork with wider and stiffer blades.

Bikeradar says "Is it a case of stiffness that goes up to 11? Possibly, but again you can't argue with the results. Riders on board Tarmacs have won more than 25 ProTour races this year, and given that Alberto Contador, Fabian Cancellara, Frank and Andy Schleck will all race them at the Tour de France, there's no doubt the frame will enjoy more success."