Shimano Tiagra CasSette Sprocket, CS-HG500-10, 10-Speed (11-34T)Specifications DYNA SYS compatible system for smooth stable shifting and driving Lock in performance with durable construction and robust adjustability Versatile gear range supports a broad range of riding styles. Wide range and smooth gear steps optimized for a broad scope of riding styles Gear combination: 11 25T, 12 28T, 11 32T, 11 34T Features Series : Tiagra Model No. : CS HG500 10 Type : HG Speed : 10 Speed Compatible Chain : HG X 10 speed HG 10