D.I.D has merged their Professional V Series O-Ring chain and their top selling Premium VM Series X-Ring chain into the D.I.D Pro-Street VX Series X-Ring motorcycle chain. VX Series street bike chains have greater rigidity and wear resistance; compared to D.I.D's previous VM Series; with a patented low friction X-Ring for maximum performance. D.I.D Pro-Street VX Series X-Ring Chains are a perfect match for your dual sport; sportbike or sport touring bike. X-Ring motorcycle chain with half the friction compared to an O-Ring chain Provides smoother handling; reduced power loss; and quicker response Greater rigidity (7% higher) and longer life than previous D.I.D VM series chains Increased rigidity means better power transfer from the engine to the ground and greater resistance to stretching under load Resists elongation and deformation due to a shorter; wider pin X-Ring design delivers overall improved performance that meets the demands of today's high-performance machines D.I.D X-Ring Chains have the greatest wear resistance of any other type of O-Ring or Non O-Ring chain Half the power loss and 1.5 to 2 times longer wear resistance (compared with normal O-ring chains) D.I.D's patented X-Ring construction reduces friction by twisting between the side plates instead of being squashed Normal O-Rings and other makers modified O-Rings have squashed points that increase friction Twisting action of the X-Ring disperses the pressure and minimizes power loss Four contact points greatly increase the X-ring's sealing performance Keeps the dirt out and the lubrication in much better than any other O-Ring D.I.D X-Ring is superior to other types of O-ring designs Suitable for motorcycles up to 1;000cc Average tensile strength of 9;220 lbs Wear life index of 3;800 Rivet type connecting links Note: Image for reference only. Actual product may vary according to color.