The new sram red exogram crankset is completely hollow all the way to the spider its hidden bolt pattern makes better use of carbon fibre to further improve stiffness and shed weight the stunning x glide r chainrings are optimised for use with the yaw technology in the front derailleur delivering seamless flawless performance exogram features the new hollow carbon construction starts in the crank arm and extends into the cranks spider it maximizes the stiffness to weight ratio x glider