Hey, just for kicks, I went ahead and tried this...
I came up with 84.25", or 213.995cm or 2139.95mm
Following the chart on the other webpage, it said to use 2140mm... and I came up with 2139.95mm just now... thats a difference of 0.002%... and hey... I'm only human... so, theres room for error...
Originally Posted by Dchiefransom
Different tires have different circumferences. The most accurate method of setting your computer is to make a mark on the side of your tire, mark a spot on the sidewalk or similar place when the mark is at the bottom. Roll your bike until the mark has made one revolution and is at the bottom again. Mark that point on the sidewalk. Measure the distance and convert to centimeters or millimeters. Set your comupter for this distance. I started using 700X25 tires today that looked bigger than another rider's 700X28 tires. My tires have a 213 cm roll out.