Aero - Cda & Crr estimate

Just for the sake of it, I though it would be fun to try to estimate the professional riders Cda and Crr with the same estimation approach I am using in the Aero - Cda & Crr estimation app. I went for the Giro d'Italia 2019 Stage 1 segment from Strava and choosed three riders from the segment for comparison. Furthermore, for plotting the riders weight I Googled them and used the weight listed there and added 7.5kg, which is roughly what the riders TT bikes weights. Additionally, I didn´t have any weather data of that day, so I assumed there was zero wind for all the riders. Here is the result: By looking at the data you can see that the Cda spikes heavily after 450 seconds, 7.5 minute. The reason is that they are going into a pretty steep hill after 6km of riding with an 180 degree turn (look at the course elevation below). Here the riders are probably braking before the corner and it affects the estimation. Another reason is that the estimation works best when there is