Hi Dario
Hops to see you in Roth.
The site you mention has some very interesting functionality for those who ride with a power meter and thanks for the heads-up on this site since I find it very interesting and useful.
I have set up a trial account with them and downloaded some of the courses that are in their system.This includes ROTH as a Verified course [meaning it has been tested for accuracy] and other courses which others have either loaded up after riding them or created using mapping software such as “Map My Ride”.
Where it gets interesting is that once you have your Functional Power Threshold (“FTP”), you can download the course, say what type of bike/wheels etc you use and what “Intensity Factor” you want to ride at. [e.g. 75% for Iron distance, i.e your normalised power avegages 75% of your FTP]
Then their software will create a Garmin Course for you and then when you ride the course [using a Garmin 500/510/800/810], it will tell you [with pop up banners and a chime] what power to ride at which will depend on the gradient and wind direction [you need to enter this also]. The intervals of differing power can be as short as 30 seconds up to 9 mins in my experience.
The wind direction stuff might be a bit OTT but I have tried this on both the Swiss Half IM course and also Lough Cutra Half and it does seem to give appropriate targets judging by the terrain.
Certainly something to consider to prevent over-cooking the Bike split in Roth!
Happy Miles!