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Fits: Honda CBR600RR 03-06. 520 steel conversion kit contains: 15 tooth chromoly front sprocket; 43 tooth steel rear sprocket; and RK 520XSO-112 link chain. RK's new XSO chains offer quality, performance and unbeatable value, for all but the most demanding high performance application. Viewed in cross-section, the RK 'RX-ring' has two lubrication pools and seal points versus the single seal point/pool design of a regular O-ring chain. All components of the MXZ4 chain are heat treated using RK's exclusive HIT (Heat Induction Transfer) process and include a clip type master link.