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520 Chain/Sprocket Conversion Kit for RD250/350/400. Each kit includes a  steel 520 countershaft sprocket with correct offset, 520 aluminum rear  sprocket and a high quality 520 roller chain made in Japan by DID and cut to the correct number of links for your model. We offer this kit for  the RD250/350/400 in the most popular street performance configuration.  The RD250/350 kit includes a 14T countershaft sprocket and a 39T rear  sprocket and chain. The RD400 (76-78) kit includes a 16T counter shaft sprocket  and a 39T rear sprocket and chain. The RD400F (1979) kit includes a 15T counter shaft sprocket  and a 37T rear sprocket and chain. Note: All 520 rear sprockets come  coated with Titan Tough coating which greatly increases the life of the  sprocket. This coating is black, similar to black anodizing . This is  the standard gearing for the RD250/350/400 with the front sprocket  lowered by 1 tooth for acceleration. Note: RD400 sprockets will require shimming. RD400 Shim kit available separately here on the site. Sprockets made in the USA, Chain  made in Japan. Choose model and click add to cart.  Note: This kit does not work with a rear 120/80 tire (causes clearance and chain adjustment issues)