On Saturday, July 20, 2019 at 8:32:44 PM UTC-4, John B. wrote:

As an addendum to the above, Andrew states that "An 11 chain at 6800
miles without wear is either a measurement error or divine
intervention."

Thus I would be sure that my chain measuring technique is correct.
Tension of some sort must be applied to the chain when measuring to
ensure that any play in the links is taken up and the chain is at its
maximum length. Some people hang the chain up and hook a weight to the
bottom link and measure the chain while it is hanging.

I use a 12" steel ruler. I have the bike on the ground, not on a workstand, and use a little wedge in the brake lever to hold the brake on. Then I apply some
force to the pedal, so as to try to drive the bike forward. As I hold that
tension on the chain, I measure it.

I suppose a 13" ruler might be handier, since I have to eyeball that extra 1/16"
but 13" rulers are hard to find.

Hmm. Maybe I should make a gauge that's exactly 12 1/16" long...

- Frank Krygowski