The Miche Pista Steel Sprocket is designed for use with track bikes for optimal performance and long-lasting durability. This sprocket is designed for 1/8-inch chains and Miche Pista hubs. To change your cog, simply undo the lock ring and remove the sprocket. Slide on a different tooth size and replace lockring. It is available in 14, 15, 16, 17, and 18 tooth configurations. Please note that the Miche Pista Sprocket Housing is also required for operation and is not included.