Motor noise at 18mph


New Member
United Kingdom
Hi all, I was wondering if someone could help .
Everytime I hit 18mph or higher using pedal assist or throttle my rear hub motor Makes a strange loud noise and bike stops assisting .

When wheel is off the ground there is no sound apart from the motor running normally .
Iv checked brake discs etc for non motor issues .
Why is it only at a certain speed it happens? If I was to pedal without motor at that speed, no sound .