This is a zone 2 ride captured by a Garmin (which I have used only a couple of times).
I don't have an explanation for the spike in power at about 17'. I do remember coming to a full stop (at a stop sign) and starting again using a high gear and accelerating quickly, but I'm pretty sure I cannot produce 1,900 watts!
Are the Garmin units prone to interference? (I never saw anything like this with th PT computer). Does someone know what can explain this?