I've noticed on a few of my recordings that the speed jumps from 0 to 146mph for no reason a few times.
Normally when I'm stationary & at the first few minutes of a ride.
I use a 3rd party speed/cadence sensor and have checked that I'm not just rolling the magnet quickly past the sensor if I'm stopped.
My Garmin Edge 800 is also synced with my sensor and this speed jump has never appeared on it.
Anyone shed some light on this
Cheers