SRAM Red 22 BB30 Double Chainset 53 / 39T - Carbon ArmsSRAM Red 22 BB30 Double Chainset 53 39T Carbon Arms The new SRAM RED 22 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 G lide R chainrings are optimized for use with the Yaw Technology in the front derailleur, delivering seamless, flawless performance. Exogram The new Hollow Carbon Construction starts in the crank arm