Specialized offers the next generation of their race-bred S-Works Tarmac, now coupled with the effortless control and power of disc brakes. Inspired by Specialized and it's partnership with McLaren; leaders in Formula 1 development; the 2015 Specialized S-Works Tarmac Disc is a revolution on the road, one that begins and ends with the rider. Each of the seven frame sizes were developed independently, based on real-world data collected from test riders. Specialized measured power transfer and steering response in each frame size to optimize ride quality and on-the-road performance for every rider, regardless of size. Proven in the Pro Tour, Shimano's 11-speed Dura-Ace Di2 drivetrain is matched with an S-Works FACT carbon crankset for fast, precision shifting no matter the conditions.