Marin Bikes STELVIO T3 APEX (2012)

PRO FIT Carbon: The Stelvio series utilizes Marin's T3, or Tube-To-Tube,
carbon construction process to deliver a chassis that is stiff and
responsive for riders wanting maximum performance. The light weight
all-carbon frame and fork combinations feature a tapered 1.125"-1.5"
head tube for precise steering control plus an ultra-stiff BB30 bottom
bracket system to transfer energy from the pedals directly to the rear
wheel for improved climbing and sprinting performance. Formed and arced
seat stays smooth out rough sections of the road to minimize rider
fatigue.