It's easy being green.
Join Date: Jun 2008
Location: in the desert
Bikes: Trek Beach Cruiser, Sun X-2 AX (bent)
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If the motor is programmmed to shut off at a particular speed, you will get drag. It's the same as if you pedal with the motor turned off, since the motor turns off when hitting certain speeds. The magnets drag on the wheel when the motor is off, regardless of why it is off.
Mine turns of at 20 mph. I've actually hit 21 mph while going down a hill with plenty of acceleration behind me. But it's all gravity and acceleration overcoming the drag at that point. Without the motor, I'd probably be going a lot faster down that particular hill. Then again, without the motor, I wouldn't be able to accelerate that much to begin with.