Originally Posted by
seedsbelize
I set mine by the rollout method. Then adjust it against the kilometer markers on the road. It may or may not be any more accurate, but it does agree with officialdom. How accurate a measurement are you going to get using chalk and reading mm? Even using a pencil?
The only truly accurate way to calibrate any wheel based odometer (bike, car, whatever) these days is to run it against a GPS for a significant distance. I've got a Garmin Forerunner and have used it on my bike along with my Cat-Eyes and the GPS is the final arbiter of how far you've gone. If you are really concerned about your calibration, buy or borrow a GPS and use it as the standard.