Originally Posted by pelirary

When I do the rollout I sit on the bike to compensate. I'm not sure if I can find a place to do the comparison of my GPS unit and the cycle computer. But I think I need to try something. I went for a 25 mile ride today, one of my usual routes, but I threw in a few extra sections. When I was home I went onto mapmyride.com and plotted out the route. I got 25.31 miles. I think that is a significant difference. So, now my question is this. Since I changed the wheel size settings, is that causing the difference? Will a smaller wheel size make the distance traveled more or less than a larger wheel size? Or is it the reverse? My mind hurts when I think about this.