bigbris1 and Operatior,

It's actually false belief that one can accurately gauge the wear of a chain based on the measurement between pin to pin. Because the brute of the wear only occurs on the pin (rivet) where the roller is over, it does not effect the external measurement, but rather the measurement that actually effects the Drivetrain. Also, Chains very, very, very rarely stretch @ the plates, further discrediting the user of a ruler. My suggestion, either user a vernier caliper or an actual chain measurement tool to accurately gauge what chain stretch your cogs & chainrings are feeling.