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Whistle from the motor at constant chat

After checking my Tinnitus, anyone else experience a whistle, quite high pitched at a constant speed, usually around 40 to 50mph? It seems to be motor related… brush-less motor so not obvious causes so it could be a characteristic?

I’ve not noticed it but it could just be my age! if it is very high pitched.

I have noticed mine always sounds quite whiny, but not sure if that’s cos I am sat on the motor, not sure what is sounds like outside.

not heard a whistle the motor does make a loud ish sound at that sort of speed but I quite like the sound reminds me of the car from Joe 90