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. Specificaiton Made from precision, laser cut steel.. Measurement: 0Ð0.6% = no chain wear. 0.7Ð1.2% = the chain is worn out and it is necessary to replace it..
Best Price: £7.00 from Merlin Cycles