My data gets ruined by speed spikes which usually occur when I stop pedaling. I tried setting wheel size to manual but that didn't help at all.
The sensor is currently on my back wheel, I got a dynamo hub in the front so switching wheels is not an option.
You can see 4 or 5 in this example and why it totally ruins my graphs, the 70+kph spikes totally ruin the scale and speed differential of the accurate readings.
Is there anything else I can do like try and ground my bike. I'm also puzzled as to why these spikes only happen when I stop pedaling, what is causing this?