Kit contains front and rear sprockets and high quality o-ring chain.
The o-ring chain is named for the rubber o-rings built into the metal rollers of every link.
Chain manufacturers include this feature as a way to improve lubrication to the links of power transmission chains, a service that is vitally important to extending their working life.
The o-rings fit into the gap between the rollers and the links that surround each roller and hold the entire chain together.
These rubber fixtures form a barrier that holds factory applied lubricating grease inside of the rollers while still applying sufficient lubrication to the chain body.
Further, the rubber o-rings prevent dirt and other contaminants from entering the inside of the chain linkages, where such particles would otherwise cause significant wear.