D.I.D. s No. 1 X Ring chain. The VX Series includes the 428VX, 520VX3, 525VX3 and 530VX3 chains for a wide range of street and off-road motorcycles from 350 ccm to 1100 ccm. Longer life D.I.D. s VX Series has a much longer chain life than the VO Series due to its patented X-Ring technology. The 520VX3 has 32% longer chain life than the 520VO and the 525 and 530VX3 have 41% longer chain life! Patented X-Ring Technology The VX Series of chains introduces the industry-leading, patented X-Ring seal technology that results in extended chain life, minimal friction and overall amazing performance. Recommended application Chain up to displacement 428VX 350 ccm 520VX3 800 ccm 525VX3 1000 ccm 530VX3 1100 ccm D.I.D is the World’s #1 original parts (OE) supplier for Japanese and European motorcycle manufacturers. D.I.D - Direct Rigidity is D.I.D’s original concept born from years of experience in MotoGP development. Rigidity in a chain means resistance to chain deformation and elongation. Pin flex robs your bike of its horsepower. The high rigidity of D.I.D pins means a quicker response, resistance from chain elongation, and smoother handling. D.I.D - X-Ring D.I.D’s patended X-Ring is superior to other O-Ring designs. The X-Ring construction reduces friction by twisting between the side plate instead of being squashed. Chain elongation is caused by pin wear. D.I.D’s patented X-Ring holds lubrication within the bushing increasing the pin and chain life by 1.5x - 2x. Endless chains The chain is continuously riveted No danger of improper connection within the chain Extensive assembly work on the motorcycle may be required for installation, e.g. removal of the rear wheel and/or swingarm Rivet Link ZJ-type Rivet and press fit type For O/X ring chain For large motorcycles You will need a tool to press in the outer plate and rivet pins Clip Link FJ-type Safety-Clip and press-fit Type For O/X-Ring chain For middle size motorcycles You need a tool to press -fit outer plate Clip Link RJ-type Safety-Clip and loose-fit Type Mainly for non-O-Ring chain For small size motorcycles You don t need any special tools