BikeMaster 530 Bmxr X-Ring Chain Features: Ideal O.e.m. replacement offering 1.5 to 2x longer wear resistance than regular O-ring chains. Each refined component, designed with computer analysis, provides higher tensile strength. Specially controlled heat treatment means tougher material and more durability. Q4 seal ring and reinforced pin and roller provide superior wear resistance, higher impact resistance and fatigue strength. Q4 seal ring offers less friction, which minimizes power loss, almost half that of standard O-ring chain. Average tensile strength of 9,700 lbs. Max engine size of 1,100 cc street Includes rivet master link