My kickr reads 20-25 watts higher then my quarq. A few years back a buddy and I went out recalibrate each of our quarq and bought a ~50lb kettle bell and followed the instructions on the quaq app. Its true that we did not need to find a specific weight but rather a known weight. Took the weight to a UPS store and got a measurement to three decimal places. We were as careful as we could be with the procedure but Im not sure it was any more accurate than it was before. I ended up reverting back to my old slope # because I was at least familiar with the offset from quarq to kickr.