Not yet. I will write a paper when every thing is fine i.e. when the results are bullet proof and when I have the time to write. In the mean time look at the picture.



Yes, I measure generally low Crr values. But tests are on a smooth wooden drum (I want to be as close as possible to a wooden track surface), results are corrected for drag to spin the drum and the wheel, and results are recalculated / corrected for a flat surface.