Great pic. If you lay a straight edge over the top of the chain you could measure the "static sag" and provide a very good rule-of-thumb for setting up single speeds. To be verified by the Park beer bottle opener test, of course! >From the photo it looks like about 1/4 - 3/8 inch? This might be more reliable even than the up-down wiggle test, as the force of gravity is pretty constant.
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