With the XX1 GXP Direct Mount Crankset, SRAM delivers the unrivaled performance of its one by drivetrain in a direct mount version, giving you the option to quickly swap out ring sizes to match the terrain. Like the normal XX1 cranks, the XX1 GXP Direct Mount Crankset is stiff, lightweight, and saves additional weight without the aluminum spider. SRAM's X Sync design provides maximum chain control, and the 168 Q factor enhances the crank's versatility. The XX1 GXP Direct Mount Crankset is compatible with GXP bottom brackets. Also, this crankset isn't compatible with direct mount chainrings designed for a larger BB30 spindles.