BikeMaster 530BMOR 106 Link Chain Upgraded Bike Master O-ring chain offers not only the industry&rsquo;s best value-price but also the highest durability Component designs optimized with computer analysis provide higher tensile strength Specially controlled heat treatment means tougher material Reinforced roller offers higher impact resistance and longer durability &rsquo;Round rivet head&rsquo; offers superior rigidity over 2 or 4-point (quad-staked) riveting