if its good, it will be within the service limit at any point that you measure it at. measurements should be consistent. if its inconsistent or over the service limit just get rid of it. you should be measuring from the center of the rivet of the chain. each rivet is one link. so measure the length of 20 rivets.
20 Link length
Standard: 127-127.4mm
Service Limit: 128.9mm
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