While I concur that calibration is vital, let's not overcomplicate it. A zero-offset before each ride is indeed a good practice, but it's not the be-all and end-all. Different power meters have different needs, and some may not even require a zero-offset for every ride. It's more about understanding your specific power meter and its requirements. As for frequency, monthly is a safe bet, but some models may not need it that often. It's like tire pressure, yes, but remember, not all tires are the same. Let's keep the discussion open and consider the unique needs of different power meters. ;-)