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Designed for urban use and small displacement bikes, this JT 420HDR chain kit combines a super-reinforced chain with a pitch of 420, a steel front sprocket, and an aluminum rear sprocket. Reference 11-51-126: 11 teeth on the sprocket, 51 teeth on the sprocket, and 126 links, ready to be installed after adjusting the tension.
Installing this kit restores the original gearing and improves the smoothness of acceleration while facilitating maintenance thanks to the XS-Rings that limit grease loss. Ideal for replacing the sprocket/chain/sprocket set on your scooters and small city motorcycles — notably APRILIA SX 50, MX 50, and MX 50 SM — for reliable daily transmission.