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Radius works for me.

For me, getting a good wheel radius reading works well. With you on the bike in a riding position, have someone measure from the floor to the exact center of the skewer on the non-QR lever side of the wheel. Circumference is Pi times diameter, so multiply your radius reading by 2, and the product of that by 3.14.

For example: the radius of my rider-loaded front wheel with a 23 mm tire is 342 mm. That times 2 = 648 mm wheel diameter. That times 3.14 = 2,147.76 mm wheel circumference, rounded up to 2,148 mm. Your numbers will be a bit different, I'm sure.
 
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