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 & 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