The 34T-MK chainring is engineered for durability and smooth shifting within a 2x10 speed road drivetrain. -Material: Aluminum -Teeth: 34T -Position: Inner chainring -Compatibility: Exclusively for use with the 50T outer chainring on the Shimano Tiagra FC-4700 crankset. -Drivetrain Speeds: 10-speed -Bolt Circle Diameter (BCD): 110mm Shimano Asymmetric, 4-bolt mount