I have a question on how to leverage the new AI for time trial training. I live where the wind can occasionally be prohibitive for the TT bike. Secondly, I have a setup with an old road bike on my trainer, hate swapping bikes on it, and would rather travel to work with the old bike for my 24hr shifts at the fire station than the expensive TT bike. How should I manage my current FTP from the indoor season on my road bike at 300W when using the TT bike now that the season is approaching? I fail workouts on the TT if I leave it at 100%, but get told I struggled if I lower it to 90% on the TT bike, even though it was appropriate. Should I manually lower my FTP to 270W and make the AI recalibrate? Or, should I keep decreasing my workouts to 90% when I am on the TT outside and leave my endurance rides/workouts at work on the road bike at 100%? Could a feature be added to address different bike positions?
I’m also curious on how to handle this. I do occasional time trial events outside so getting some endurance and sweet spot workouts are needed to get more time on the TT bike, but doing them at my road bike FTP is not going to happen. What is the best way to handle this? Also, when I go all out for a race, my watts will be lower for the same effort even though the speed is higher. Does the AIFTP have anything to handle these different disciplines?
Just a little bumpy bump on this. I just did another TT race where I had an power of 266 and 269NP and .89IF (300w FTP), but my HR was full on race levels, 176 avg & 192 max. Should I click this activity off from being part of TR AI or just leave it? I think my calendar is public, TrainerRoad.
After a few months now, I want to circle back to this. I went with the strategy of reducing my FTP from the road bike by 10%. I had done all of my training in the winter on a road bike for a 301 AIFTP. I manually decreased down to 270 and let TrainerRoad adjust my workouts and athlete levels. Initially, the threshold and SS workouts were a little tough because it increased the interval duration significantly because it though I just straight up went down 10% FTP. But 270 was still my threshold in the TT position.
I was honest with the RPE surveys and my workouts adjusted to appropriate difficulty in a week or 2. I have also been doing my Z2 rides on the road bike and at about 5-10% higher power than the workout suggests, because it’s not the TT bike. After 28 days, it gave me an AIFTP detection. I did not accept it because it was a 7.5% increase up to 290. I manually added 5 more watts to 275. Workouts still felt appropriately hard until the end of the next 28 days. Workouts definitely felt too easy even though interval duration had increased significantly. I accepted the latest AI FTP detection now at 300. This seems to be a tad on the edge of what may be appropriate after 2 weeks, but it was a big jump.
In conclusion, I feel that manually decreasing FTP to my estimated TT bike penalty and allowing the AI to adapt has worked well, but you need to be honest with how hard or easy the workouts should feel and know your body to assess whether the following AI FTP detections may be too high, because the system still thinks you are on a road bike and can do way more.
I’m glad things are working out for you @farmebre. 
I do think it could be cool to have a “garage” of bikes to choose from in TR, with each one having a unique offset due to power meter discrepancies, or radical position differences (such as TT in your case).
As of now, though, there’s no way to tell TR why your RPE for a specific power is changing, so it’s probably best to adjust your FTP if you’re making a lasting switch between bikes and you have some sort of info on the difference in power output between the two bikes.
Otherwise, simply adjusting workout intensity and answering RPE surveys will get you there, as you discovered recently.