Chain & Sprocket Kit Contents: 14T Front Sprocket - SPF56914C 50T Rear Sprocket - SPR85650C 116 Link RK Chain - RKP520KRXX116 RK Kit Box - SPRKITBOX RK chain and sprocket kits are the perfect drive maintenance kit for your bike, including a strong and durable 14T front and 50T rear steel sprocket, constructed from SCM420 chromoly steel alloy (front) & C45 high carbon steel with a electroplated Zinc finish (rear) paired with a high-quality RX-ring RK chain this kit has everything you need to replace your old warped and stretched chain and sprockets. The perfect alternative to expensive OEM replacements while designed to meet and exceed OEM specifications. Supplied in presentable packaging with a carry handle for convenient transportation. About the Chain: With a pre-stressed and pre-stretched process applied to maximize the life of the chain. KRX series chains are equipped with the unique RX-ring technology, by doubling the sealing surfaces the seals seal significantly better against water and dirt, resulting in a 25% increase in life compared with an O-ring chain. Perfect for those seeking a long life chain in all riding environments. Fits: Yamaha YZ250 1998