The Sram GX X-Sync Crank delivers consistent performance every time out. Featuring SRAMs X-SYNC tooth profile, the GX crankset is engineered for complete chain control. Each tooths thickness is CNC machined to work seamlessly with the chains inner and outer links. And with five available chainrings (30-32-34-36-38), you can personalize your gear range to match the way you ride. Sram GX X-Sync Crank Features SRAMs X-SYNC tooth profile GX crankset is engineered for complete chain control  Tooths thickness is CNC machined to work seamlessly with the chains inner and outer links.   Five available chainrings (30-32-34-36-38)