Gray, so how do you perform this chain measurement for wear?One of the easiest accurate ways is to use a 6" vernier caliper. These can be had for around $20 in the non-dial version, and they will do outside, inside, and depth measurements. Draw the chain tight and take a measurement from the inside of 1 roller to the inside of the 11th roller (it will be a measurement close to 6"). A new chain should measure 5.85". By multiplying this by 1.015, we get 5.94". 6" is 102.5%, and is the 2.5% stretch limit recommended in the manual. Be sure to measure several sections, as the wear may not be even throughout the chain, and one long spot will damage the sprockets just as if the whole chain were long, although it will take longer.