The new sram red exogram crankset is completely hollow all the way to the spider its hidden bolt pattern makes better use of carbon fiber to further improve stiffness and shed weight the stunning x glide r chainrings are optimized for use with the yaw technology in the front derailleur delivering seamless flawless performance exogram technology uses a large hollow cross section all the way to the spider minimizing weight while maximizing stiffness our stiffest crank ever