Whenever I’m not pedalling there is a short grinding noise just once per wheel revolution.
It is a lot quieter (but still there) when pedal assisting the motor. It seems to have been since this last couple of weeks riding in the bad rain. My chain very suddenly got very rusty and I’ve put GT85 on it and on the rear hub – it looks a lot better but the noise is alarming when not pedalling. Any suggestions what to do please? I’ve only done just over 250km on the bike in total