Wheel Circumference Measurement for Garmin Edge 500
 

I am in the process of setting up my Garmin Edge 500. I have a 700c wheels and run 25 mm Continental GP4000s tires. My best effort at measuring the diameter of these wheels was 680 mm. Hence, the circumference would be 680 x 3.14... which comes out to 2136 mm for the circumference. Is that within the proper range for this setup?

Better yet, take a bike ride on a measured course and use the late, great Sheldon Brown's method. Google maps and the like make it relatively easy to set out a measured course and you get probably the most accurate calibration for your weight, tire, pressure, and courses you will ride in the future.

The edge works out the wheel size for you using the GPS.

Alternately, just measure the effective circumference the obvious way: mark the tire, line that up with a mark on the ground, sit on the bike and roll it forward one revolution. Make a second mark on the ground where the tire's mark ends up. Measure the distance between the two marks.

^This.