Originally Posted by
JohnnyCyclist
The speedometer sometimes misses a rotation or three (like when you're doing 20mph and the display says 8, then jumps to 12, then to 20)
If the sensor is mounted away from the hub, it might be more reliable moved closer to the hub.
Originally Posted by
JohnnyCyclist
is subject to magnetic fields (there are sections of road where it will read 80mph - don't know what's underground, but something certainly affects it).
This problem is radio interference with the wireless transmission from the wheel sensor to the head unit.