Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,214
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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For me the most accurate is my wired computer, it measures with great precision the number of wheel revolutions. Least accurate is my GPS, the wireless computer comes in between.
But I have WAAS and Glonass turned off to save battery life on GPS so I intentionally reduced accuracy.
I measure circumference of the wheel by rolling it once along a tape measure and measuring it to nearest eighth of an inch. Then convert that to mm and input into the computer.