Cannondale's Scalpel-Si Carbon 2 ascends like an angel and descends like a fiend. The super-stiff Ballistec carbon frame and oversize bottom bracket on the Scalpel-Si come into their own when you need to step on the gas. Rocks and roots are no big deal with 100mm of RockShox Monarch travel in the rear. Up front, the 1.5-inch head tube and Cannondale's 100mm-travel Lefty 2.0 Carbon XLR fork chew up rocks and roots, transforming your techy sections of trail into a magic carpet ride. This XC rocket is dressed to the nines with Cannondale CZero carbon rims and tubeless-ready Schwalbe tires that track through buffed singletrack and chunky gnar with aplomb. Cannondale supplied their own HollowGram Si cranks, and paired them with an 11-speed SRAM XX1 drivetrain. Shimano XT brakes keep the party under control with power and unbelievably controlled modulation. A carbon handlebar, carbon seatpost, and stem from Cannondale, and a Prologo saddle, round out the contact points. When it's time to cut to the front of the pack, you need a Scalpel.