I have recently acquired a stages (left side only) power meter and have noticed the following:
- My normalized power on a 3.5 hour ride is at least 12% higher than my tested FTP.
- I have recently spent more time riding outdoors (during our lovely South African summer) than indoors on the trainer. So about 6 weeks after my previous test, I tested at EXACTLY the same FTP this morning. I tested using the 2x8 min FTP test.
So my questions are:
- Should I adjust my FTP based on outdoor NP? Or rather stick to the tested FTP? From perceived effort, I am not sure that I will be able to sustain that NP on an indoor trainer.
- Why the major difference? Overheating?
Look forward to some valuable input.