EK Chain 420 SRX Chain The EK SRX Series Chains introduce QX-rings that significantly enhance performance over standard O-ring chains. Laboratory tests indicate a 40 reduction in friction with QX-rings, enabling these chains to outlast traditional O-ring types by up to 50. Strategic drilling in alternate links reduces weight without sacrificing strength, resulting in more power transmitted to the rear wheel and improved throttle response. This combination of features promises enhanced longevity and superior performance, setting a new standard in chain technology. Features: Can be used for street or dirt motorcycles QX-ring 40 less friction compared to an O-ring chain Weight reducing holes Compatible displacement: 150cc Tensile strength: 4609 lbs Includes clip semi-press type master link