Originally Posted by
WhyFi
According to your first post, it's assumed, not known.
Well yes, technically I see the point. It's a basic bicycle computer though so I am going by the charts. When you are talking millimeters one can also be off in the the roll out measurement.
I think setting the computer half way between the two measurements will do for now, for the way I use such data, until I get a different computer with two settings. Then I'll delegate this one to a different bike.
I'm not really into stats and only use it as a rough guide when riding. On tours in my region turn offs or crossroads are pretty far apart so I only need to know approximate distances, km's not meters.