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Thanks for your suggestion. The bike is reading the speed from the front hub, I've opened it up and there is one magnet on the motor cover and a pick up on the inner hub. The bike was working normally and just stopped working, the mode controller also stopped working. I re-calibrated the torque...

I have an Arv with a Tranzx pst front hub motor. The speedo is giving totally the wrong speed causing the motor to cut out, for example riding along on the flat doing no more than 10km/h the speed will be reading 45-60 km/h. Does anybody have any ideas on fixing this? Peter