The tool is placed over the rear sprocket at a point where its chain contacts the sprocket.
The tool is clamped to the sprocket and becomes aligned with the sprocket.
The tool has an attached pointer which extends outwardly in a direction parallel to the surface of the sprocket.
The end of the pointer should align with the chain if the chain is in alignment with the sprocket.
Helps reduce power loss from misalignment and helps to prevent premature wear of your chain.
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