Originally Posted by
burnthesheep
I think it is time to replace the on-road power meter. It's the shorter crank I use for TT and road bike. It reads from 15 to 30w less than my Kickr and another meter on another bike (longer crank). Since it reads less than a smart trainer, that means drivetrain loss makes the difference even more.
When your ftp is under 300w, a 30w difference is massive.
By the power readings of that thing, I must be breaking physics on my TT rides to go the speeds I do on such low power. Must have a world record CdA even without ever tunnel testing. LOL.
Starting to not be something I can routinely ignore.
Why?
Hear me out for a second... If your PM on your cranks consistently reads X watts lower (or higher), and you know what your wattage ranges should be on that powermeter (i.e. YOU're calibrated to that PM), then does it matter?
For example, if you know that when the PM reads 300w that is about all you can sustain for a 20 minute solo breakaway, does it really matter what your real threshold is?