D.I.D's #1 selling MX chain Top choice for 250 class factory motocross race teams Non-sealed, solid bush chain with uncompromisable strength 25% greater anti-shock performance and 5% higher tensile strength than the previous generation, without any added weight Part description explanation: eg, 520ERT3 x 116 520 = chain pitch; ERT3 = chain model; x 116 = number of chain links (bike/sprocket specific – please check fitment charts or contact us) We recommend all bike parts are fitted and tested by qualified professionals. If you are unsure about the part choice for your bike, please contact us before purchase. Chain Specifications DID Chain Spec chart