Rode the rollers tonight and on my steady state interval the wattage seemed too low on the higher intensity efforts. For background I have the kreitler 2.25" rollers with no resistance. They have a wattage chart they made with SRM:

http://www.kreitler.com/wattage.php?section=wattage

On my warmup and zone 3 riding all seemed fine. Average power 162 with average speed 16.32. This maps to the above wattage chart. Also, after 15 minutes of warm up I spin for half an hour around 18mph and the wattage was spot on with the wattage chart.

Here is the issue: when I do my steady state at 165 HR my speed goes to an average over 26mph, but my wattage showed an average somewhere in the 260s - not even close to the 330s for the wattage chart. This happened in all 3 of my efforts and after the first effort I recalibrate and zeroed - nothing changed.

To boot I went back and looked at my powertap files and some files that had rides on the same pair of rollers. Guess what, the powertap ones map to the krietler wattage page. Truth be told they are not exact, 29mph efforts are 331 wattage, but they are certainly closer to what I got this time with my new cinqo.

Any thoughts, I am happy to send files if that helps.

I did the zero by leaving the arms with drive side at 6, did not touch the any part of the crank or pedal and hit calibrate on the garmin and got a return I think of -177. I did the same after my 1st effort and can't recall the exact return, but it was around the same and I did the auto too by backpedaling by four turns of the cranks.