Originally Posted by
Banchad
I've emailed the manufacturers of the bike I use(Matrix IC7). Their website claims the power meter in the bike is accurate to +/- 1% and never needs recalibration due to it using photocells which I believe is an extremely similar concept to the Ergomo Pro Powermeter that was floating around a few years ago. I'm taking this with a hell of a pinch of salt as the maximum I've ever seen on my Garmin Vector is 1400 ish whereas I'm seeing 2000+ on this static bike. I'd try to compare it on the other static bike they have in the gym but its out of commission for the moment.
In my limited experience calibrating laboratory equipment you can claim a 1% accuracy, and not mention that it's for 25-650 watts. Another hypothesis could relate to the sample-rate. If you Garmin only samples at 1Hz (1 time per second) it'll miss a LOT of data for efforts like sprinting. However, if your ergo samples at 100Hz, or 500Hz, then you're very likely to put up much higher numbers.