Tested relentlessly the Giant Propel Advanced SL 1 ISP 2014 Road Bike has been made as aero as possible from every yaw angle setting an all new standard for speed. Its Advanced SL grade carbon construction is the ultimate material for road bikes offering impressive stiffness at a super light weight. An integrated seatposts helps to create an even more aero frame & increased performance. Does aero matter? Apparently so, over a 40km distance at a constant 40km/h the Giant Propel Advanced SL 1 ISP 2014 Road Bike with its Aero System Shaping Technology will shave 12-36 seconds off your final time without any sacrifice to general road bike performance. Key Upgrades Over The Advanced SL 3 Shimano Dura-Ace 11 Speed Componentry Zipp 404 Firecrest Carbon Wheelset Giant Speed Control SLR Brakes