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I think you are correct on the 25kph/15.5mph limit but it was recently explained to me that there is more to that 250 watts figure than meets the eye. I was puzzled how Bosch, a German company, is offering 600 watts on their top models, and it was explained to me that the motors have to be able to produce 250 watts for a set period of time, without overheating, at which point they get a "nominal" 250 watt rating. That does not mean they can't produce more than 250 watts. It's weird, but that is how it was explained...

I always wonder if the reason there is more hate for e-bikes in the US compared to UK and Europe is because in the UK/EU they’re limited to about 15.5mph compared to 20mph in the US. Honestly if people were blasting around our local trail centres at 20mph I’d probably be more keen to restrict where they can go. Whereas 15.5mph is a speed that is much more easily matched by pedal power alone (if not uphill).