Today's group ride seems like it'd be good for checking my FTP- one hard > 20 min climb and a fair amount of extra-hard riding on the flat/rollers to stick with more powerful riders.
But using different methods, I come up with different numbers. If I use the Allen/Coggan method of looking for a 'step-down' in the power distribution graph, I see the largest from the 260-270 to the 270-280 buckets, suggesting an FTP of 270. If I take the avg power number from the best 20 min of the climb (263w, 4.1 w/kg) and subtract 5%, I get 250. Now I know I didn't go at 100% on the climb, I was saving just a little, but I don't think it was that much. I have a hard time setting my FTP to higher than my max 20 min power for the ride- that doesn't seem to make sense. What would you do?