520 ERV7 - Drive Chain - 120 Links - The 520 ERV7 chain boasts a 3% higher tensile strength due to stronger inner side plates and thicker pins - Due to increased X-Ring durability, the ERV7 sees a 13% wear resistance increase - 520ERV7 is the top-of-the-line racing chain for all types of motorcycle racing, on and off road - Incredible design and utilization of D.I.D's patented X-Ring seal technology makes the ERV7 a top performing racing chain available - Utilized by many factory teams worldwide

520 ERVT - Drive Chain - 120 Links - 520ERVT breaks down the concept of the original motocross chain (non o-ring) and adds the benefits of an x-ring - X-Ring helps keep your chain sealed with lubrication, limits dirt and mud from getting in-between the side plates, and only has 4 contact points with the plates which means less friction than the traditional O-Ring chain - More lightweight and longer chain life - By adjusting the materials, the 520ERVT is now 2% lighter and has a 15% longer lifespan, all while maintaining the tensile strength