Kit contains both front and rear sprockets and o-ring chain.
The o-ring chain is named for the rubber o-rings built into the metal rollers of every link. It is 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.
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