SRAM Rival1 Crank Set GXP 170mm w/ 42T X-SYNC (GXP Cups Not Included): 10/11SPD 170MM 42T

Sram:

The SRAM Rival 1 crankset delivers consistent performance every time out. Featuring SRAMs X-SYNC tooth profile, the Rival 1 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 seven available chain rings, you can personalize your gear range to match the way you ride.