A worn chain makes for poor shifting and can slip over cog teeth, causing premature wear of chain rings and sprockets. This tool features two gauges for checking chain ware: a/ +0.075 per link, chain should be replaced soon to avoid chain ring or sprocket damage, b/ +0.10 per link, chain should be replaced immediately, chain rings and sprockets may already be damaged. Tool made of high precision cut stainless steel.
