The BOX Two Prime 9 Chain features Prime 9 Technology, delivering a wide range without added complexity. The wider chain design provides strength and durability for demanding riding conditions. This 9-speed chain has the outer width of a standard 9-speed chain but features a narrower inner width to match 10/11-speed narrow-wide chainrings. It is compatible with most 10, 11, and 12-speed chainrings as well as BMX 3/32" chainrings and cogs. An 8-speed variant is also available with the outer width of a normal 8-speed chain but a narrower inner width, optimized for use with BOX Four Narrow/Wide chainrings.