New Xert user here, pretty new to cycling as well but not entirely.
Since late last year i have been using a Kickr V5 for indoor training and this spring i got a pair of Favero Assioma for my road bike (separate bikes indoors and outdoors because of reasons). Having a pretty weak endurance i have mostly done slow rides and added time in the saddle gingerly. Dabbled with some structured stuff on Zwift but not a lot, did the ramp test a few times and was between 200 and 210 watts. Fast forward to a couple of days ago when i tried TrainerRoad and Xert to get into a little bit of structured workouts with intensity…
After a few rides i chose Xert (obviously) and after yet another few rides (all of them outdoors, weather has been decent the last couple of weeks) i get a couple of breakthroughs and a Threshold Power of 239. I somehow doubted it, but at the same time i have been riding quite a lot this summer so i figured it might be accurate. Today i got home from work and had an indoor session planned.
Started “Where The Streets Have No Name” and eventually i gave up, free riding the last 15 minutes. It was simply too hard to make any sort of sense so i got out to the garage and took the Assiomas off the outdoor bike and got them sorted on the indoor bike. Calibrated both the pedals and my Kickr and lo and behold; Kickr says 100 Watts, Assioma says 125. No wonder Xert thought i was way fitter than Zwift’s ramp tests and no wonder the workout made me suffer almost as much as the song.
My plan is to use the Assioma app to change the power it reports by -15% (which will pretty much bring it in line with the Kickr) and set the Threshold Power in Xert manually in the account settings to ~200. I assume this value will only be temporary and change upon decay or breakthroughs? Is this a good plan or an awful plan? Why, why not? Are there any alternatives?
TL;DR: Indoors and outdoors power meters are not in sync, what to do?