No-nonsense, unadulterated speed—that's what our S-Works Stumpjumper Di2 brings to the table. It's made from our finest carbon fiber, and it's built off of our revolutionary XC 29 Geometry for explosive power, incredible climbing prowess, and nimble handling. At the rear, the hardtail design with razor thin seatstays blends maximum pedaling efficiency with added compliance. Add to this our Brain technology at the RockShox RS-1 fork that differentiates between rider and trail input to stay firm under effort and plush over bumps, and you have a bike that sacrifices nothing in its pursuit of speed.