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My wife's recently-acquired 2015 Kalkhoff Impulse Ergo (yes, I know!) works fine but there is one oddity. She can complete a ride, see >30MPH going downhill, but when she gets back the Max Speed logged will be something like 16MPH. Even when the average is 13MPH over 10 miles. I've checked the...

I'm an e-bike newbie - in fact I don't have one yet at all! My wife has just got a secondhand Kalkhoff Impulse Ergo, so I've joined Pedelecs to find out all about it (yes, I now know it is the world's least reliable motor.....but only 350 miles on it when we got it so happy to wait and see)...