Add Avid Elixir CR brakes with Taper Bore Technology, & you have performance trail technology you can trust & quickly get you there & back again no matter where "there" may be. Features include: Hollow Forged AL crank arms for lightweight super stiff durability, X-Glide 2x 10 shifting technology, 26-39, 28-42 gearing, New GXP Bottom Bracket System featuring Gutter Seal Technology. Available in the following bottom bracket configurations: BB30, & GXP.