Being off 1/2" means less than 2 miles in every hundred, but if you want an accurate reading follow one of these videos: https://www.youtube.com/results?search_query=set+bike+computer+wheel+size
SOURCE: what number do I put in for wheel size 700x23 on a
You don't want to guess. Every tire varies from the nominal size to some extent. Measure one wheel revolution on the ground in millimeters and use that number. With 4-digit accuracy it seems silly to ballpark the measurement.
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