Utilising Open Core Technology, the OCT Chainsets crank arms are hollow-forged out of AL-6066 alloy for maximum strength & mount our new Power Glide™ 10 speed chainrings. The package, weighing only 791g, is finished off with SRAMs GXP™ bottom bracket, which has been designed to increase power transfer & rigidity while reducing component wear. For riders who want the power transfer & performance but dont demand the weight savings, SRAM offers the SRAM Rival chainset in a solid-core version.