EK Chain 525Srx2 Chain The EK Srx2 Series Chains are equipped with advanced QX-rings which significantly surpass the performance of standard O-ring chains. Laboratory testing indicates a 40 reduction in friction with QX-rings, enabling these chains to extend their lifespan by up to 50 in comparison to traditional O-ring chains. Efforts to minimize rotating mass led to the introduction of weight-saving holes in alternate chain links, effectively maintaining the chain's strength. These features collectively contribute to an increase in horsepower at the rear wheel and an enhanced throttle response. Features: Can be used for street, touring or dirt motorcycles QX-ring 40 less friction compared to an O-ring chain Weight reducing holes Compatible displacement: 1,000cc Street / 750cc Dirt Weight per 100 links: 4.32 lbs Tensile strength: 9,000 lbs Includes screw type master link