The 2015 Cannondale F-Si Carbon Black Inc. is a true sleeper, with the high-power heart of an XC monster beating beneath that understated, stealthy black paint. The HI-MOD Ballistec carbon frame features Cannondale's breakthrough Asymmetric Integration rear triangle and drivetrain, delivering super short chainstays, an optimally dished rear wheel, and tons of mud clearance. New-school System 29 geometry redefines XC handling and speed, showcasing agility and handling in switchbacks or attacking rough terrain at high speeds