RK Chain and JT Sprockets For Honda CBR600 RR-3,4,5,6. RK Chain and JT sprockets. This kit come with a 520XSO RK chain, with a 16 tooth front sprocket and a 42 tooth rear sprocket. Majority of our listings are for a direct replacement for your original part. Our parts are made of quality and are designed to meet or exceed the original OEM Standards. Our products are often a cost effective alternative to genuine OEM Parts. Please note? The models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models. We supply one of the largest range of motorcycle, quad and scooter parts from 1970 to present day. We are a family run business that have a long history for a passion for motorcycles which lead us to start trading in 2007. 24 hour Courier:? 8.99. All goods are despatched via royalmail or courier depending on size and Value. We deliver to most areas of the world.