How good is the S-Works Tarmac Di2? In its first season, it won two Grand Tours and a World Championship—not too shabby. With its Rider-First Engineered™ design that ensures peak performance across every size frame, coupled with the legendary performance of the Dura-Ace Di2 11-speed build kit, it's no wonder that it's the bike of choice for several pro riders. If you're looking for the ultimate in complete road bike performance, look no further than the S-Works Tarmac Di2.