Chain & Sprocket Kit Contents: 12T Front Sprocket - SPF27912C 55T Rear Sprocket - SPR430755C 120 Link XAM Chain - XC520AO120 XAM Kit Box - XSKBOX XAM chain and sprocket kits are the perfect drive maintenance kit for your bike, including a strong and durable 12T front and 55T rear steel sprocket, constructed from C49 high carbon steel paired with a high- quality O-ring XAM 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: XAM's AO series are high-quality O-ring sealed chains for all on and off-road applications. The O-ring seals ensure a longer life of your chain over a standard heavy duty chain. XAM's AO chains are an excellent cost- effective alternative O-ring sealed chain.