Fun little discovery / future research. When riding with @alexhelvetica@cloudisland.nz today, our activities both showed that we had max speed of more than 90km/hr. We both use speed sensors, not GPS. Both activities recorded the speed glitch at the same location. I told @DropTableFoxes@social.stackunderflow.com about it and they mentioned their e-bike freaks out at a certain intersection around there from time to time. I went through all my activities searching for max speed irregularities and found that practically all of them were near train or tram lines - 3 of them the same train line spot. My hunch is that maybe tram / train motor current is causing enough magnets to trip the speed sensor. Possibly the feeds might be underground as well? The only problem with this theory is that I spend a lot of time near tram and train lines - so it might be something completely different.