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A worn chain shifts poorly and causes undue damage to the sprockets. The tool is a Ògo, no goÓ gauge designed to accurately indicate when a chain is worn out.
Please be aware that the images and description above are usually supplied by the brand / manufacturer and are in no way affiliated with Cycle Centre Congleton Limited T/A CycleStore. Cycle Centre Congleton Limited T/A CycleStore only resell items from third parties and do not design or manufacture any products.