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Cannondale's 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. With a 1.5-inch head tube and Cannondale's Lefty 2.0 Carbon fork featuring 100mm of plush suspension travel, keeping your front wheel pinned to your line is easy no matter what the trail throws at you. This cross country rocket's unheralded performance continues with Shimano's XTR Di2 electronic drivetrain, a 22-speed setup that offers unbelievably fast, nearly effortless push-button shifting. Matched to Cannondale's own Hollowgram SISL2 crank, the competition will have no idea how you got so fast. And, total control is at your command with Shimano's XTR Race brakes. This epitome of XC continues with only the best: ENVE tubeless-ready carbon rims, Cannondale Lefty and Chris King hubs, and a selection of ENVE's finest cockpit components. It might look like a sleeper, don't worry though, your XC domination will do the talking.