I have the same problem but I wonder if it even matters. I have a general idea of what power I can hold for a given time outdoors and indoors with outdoors being considerably higher. However, I still feel that the TR workouts still are a great benefit to my outdoor efforts even though the indoor numbers are lower. Somehow working out indoors at a lower measured power pushes my already higher outdoor power up further. All I really have to do is discount the stupidly high TSS scores from my outdoor rides.
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