I have a pair of Assioma Duo’s, about 5 years old, with about 50k miles on them. I just got a new Saris H3 Smart Trainer. There is a significant discrepancy in the power readings to the tune of 30+ watts, consistently over multiple rides on different days. I get that they wouldn’t be totally harmonious but it’s my understanding that typically the pedals might read higher and/or “spikier” power because they are closer to the generating source and more sensitive to input. However, this is not the case. The pedals are reading the lower power numbers. Everything has been calibrated, etc. properly on every ride. My question is whether power pedals can wear out or degrade over time?
The power displayed in app during a workout will default to the power meter, not to the trainer. But the trainer is providing the resistance. In effect- regardless of which reading is correct- I’m having to compensate for that 30+ watt discrepancy. For example, an interval may be for 200 watts. The trainer reads 200 watts but the pedals are only reading 170 and that’s what the app displays. This forces up the resistance on the trainer so that the pedals will read 200. But then trainer is then reading 230. A few watts off would be no big deal to me. I don’t care so much about the absolute power and which one is correct per se, but consistency is important. This is to the tune of 10-20% off at times. Currently, I’ve just turned off the pedal reading so that the trainer can just do it’s thing. It seems to respond faster to changes this way. I’ve had a month off the bike from injury so I expected a loss of fitness and compensated by adjusting my FTP way down. I’ve also moved from mostly outdoor rides to indoor rides so it’s somewhat difficult to assess which device is off, though the pedal reading feels more out of whack, ego aside.