I do most of my power-targeted training on my stationary bike, a sweaty and rusty sacrificial bike attached to a first gen Wahoo KICKR CORE, and synch with Xert for my training plans.
I have a gravel back with a SRAM Rival power meter (PMQ8303003) which consistently gives results significantly higher than the Wahoo. Normally wouldn't be a major issue and I have my own idea of what "250 watts on the Rival" will be (closer to 195 for me!) - except that the higher power results from the Rival really confuses Xert's automagical algorithms, and Xert keeps wanting to bump up my FTP.
No amount of zeroing at start of ride, during ride, etc brings it in line with the Wahoo. While I recognize I just need a single "source of truth" for the power data, having ridden a number of power meter-equipped bikes over the years I'd like to use the Wahoo as that reference, since a) most of my power-targeted training is on that bike (see above) and b) I know from "feel" that unfortunately for me the lower power results from the Wahoo are closer to accurate.
I seem to remember reading somewhere on the web a way to adjust the power curve results of the Sram Rival meter, but can't find that info anywhere anymore.
Alternative will be to disable the Sram power meter and ride to HR on that bike, which admittedly isn't the end of the world.
(1) Can you temporarily attach the SRAM power meter to your other bike to validate the results directly against the Kickr?
(2) Fitfiletools.com has a power meter adjustment option. You could export the "Rival" rides fit files and run it thru that tool before uploading to Xert (sounds a bit clumsy but in reality quite quick to do once you've done it a few times...)
(3) Is SRAM power meter still under warranty? If so, can it be returned for re-calibration or swapped out to another unit?
have you done a spindown on the kickr ?
try to borrow some power pedals & see whether they better align to either trainer or SRAM ?
There's also a 'factory spindown'' option for the Kickr, which may be worth a try if it seems to be well out of whack. Google will point you in the right direction, but I found it didn't work using the standard Wahoo app on my iPad, however there's also a separate Wahoo Utility app, which makes the procedure a lot more obvious. It's basically a sort of double spindown with the trainer applying heavy resistance during the second one to nail the calibration, or something like that.
However it works, it's maybe worth a try. I used it after rebuilding a Kickr - new bearings everywhere.
Thanks all. I'm reasonably confident the Wahoo is "more accurate" or at least more consistent, which is what I'm looking for; as mentioned, a few more options for zeroing the Wahoo and simply based on feel, whereas the Rival seems to be "randomly higher than the Wahoo".
Thanks for tips though - will have a look at Fitfiletools.com. The Rival is out of warranty now, as about three years old.
Thanks again all!