Factory Spec, FS-520-OOR, Heavy Duty Orange O-Ring Drive Chain 520x118 ORing 520 Pitch x 118 Links O Ring O-ring style means it will last longer with less maintenance than conventional chains This chain is the appropriate length for stock gearing, swingarms, etc. In some of these compatible vehicles, o-ring chain may not have proper clearance with chain guards, case savers, etc. This o-ring chain measures approximately 22.75mm (0.895") wide. Please check your machine for clearance.