Posted by Joe Scho (142.150.226.11) on November 07, 2003 at 12:25:02:
In Reply to: Re: Tacx Calibration Follow Up posted by Cris on November 06, 2003 at 18:09:01:
For calibration purposes using only the speed reading, obviously speed is very important: You are using this in the calibration procedure whether you use 30 Km/h or 40 Km/h as your starting point in a roll-down test. From what I understand, at the zero resistance setting the speed calculation does not incorporate body mass or height or any other parameters. It makes sense to me to use the pressure on the tire as a way to calibrate the system and not play around with the "scale factor". I simply wanted to know if the procedure outlined here was consistent with that outlined on the wattage list. How long does a roll-down take starting from 40 Km/h if it takes 6.08 sec from 30 Km/h?
In principle, I agree that the power measurement is all that really matters unless you are competing with someone else via a performance file or over the net.
Furthermore, I think that if you have a powertap or some other reliable power meter I wouldn't bother too much with the tacx.