RK Upgrade Kit ZX10 (ZX1000 B1-B3) Tomcat 530 Chain Conversion 88-90. ? Fitment note: The Make/Model filter is for guidance only. The product description is the definitive fitment reference. If you’re unsure, message us and we’ll confirm fitment. Terms and conditions apply. RK OE upgrade chain and sprocket chain and sprocket kits contain a heavier duty RK chain than that supplied as OE on the motorcycle when new. They are supplied with high quality steel sprockets. Sorry, our items are NOT available for pick-up. No additional information at this time.