Chain & Sprocket Kit Contents: 16T Front Sprocket - SPF56916C 45T Rear Sprocket - SPR84545C 108 Link RK Chain - RKP520SOX108 RK Kit Box - SPRKITBOX RK chain and sprocket kits are the perfect drive maintenance kit for your bike, including a strong and durable 16T front and 45T 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 O-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: RK's traditional round O ring chain is a convenient blend of performance and affordability. SO series chains are suitable for low to mid-range CC motorcycles that came from the factory with sealed chains. Manufactured with hi-carbon alloy steel for strength and durability, with nitrite butadiene O-rings that seal in lubrication and deliver smooth power with minimal drag and horsepower loss. Fits: Yamaha SR250 1980-2001