Is there a quick and dirty way of telling what your coefficent of Drag (Cd) is from an FTP output? Similarly, can you calculate what your estimated speed should be for a given FTP? I say quick and dirty because I don't want to have to calculate this information from analytical software (if I don't have to) where you have to input bike + rider weight, air density, surface friction, wind speed, etc. Lets just say for simplicity an average rider weight of 170#, avg. bike weight of 17#, no wind, smooth flat road, etc. And, the FTP was determined by a down/back time trial that lasted 20 minutes (FTP=95% of max sustained avg. power for the effort). I'm asking because I'd like to know for an estimated 20 min. avg. power of 350 watts what my average speed should have been. If my average speed for this effort was 27.2 mph, is my Cd pretty good? Thanks Rob