Hey guys, I've done 3 rides with my new Powertap G3 and just trying to get a rough idea of what the data means. I plan to do an 20 minute FTP test when conditions allow but even a 20 minute uninterrupted effort is difficult where I live (west Los Angeles.) Am I missing something or does this data indicate my FTP is around 275-300 watts (5'9" 170lbs.)? I plan to start calibrating the Powertap every ride but the first time I did it the calibration value was 504 which is within the normal range.
You may have an FTP of 275+ but the data you've got so far doesn't support that number. With a 275 FTP your 5min power should be 350+ and your 20min best effort should be at least 5% higher than 275. I wouldn't worry about it for now as it's not necessary for training or riding. Even if you are planning on a structured training plan it's not really necessary as your effort levels for particular intervals will be self-correcting.