Originally posted by Astra
Another way to measure is to unroll a roll of wallpaper on the floor, blank side up. Draw a narrow line across it at one end with kids poster paint. Now get on the bike and ride along the wallpaper. Your tyre will pick up paint and draw a second line about seven feet from the original line. Measure the distance between the two lines. Do it with both bikes and I'll bet there's a difference of a few inches between the two.
Well I decided to use the most scientific method I could think of. Then reality set in when I priced the laser range finders
and we just lined the valve stems up until they looked like they are at the very bottom, drew a mark on the driveway, rider rolls forward until valve stem looks like it is down again, make another mark. 3 1/4 inches differance in the 20 inch tires (give or take a 1/4 inch). I guess that is close enough. Thanks all for your help in this.
