If you are using the off-road mode, this is actually normal. That mode basically unlocks the bike to its full potential. You will thus notice that when the battery level gets lower, you will have less boost. How hard you pedal yourself, the weight carried by the bike, the speed of the wind, the road surface and other factors influence as well the top speed you will reach. That mode will allow you to ride up to 30km/h on average.

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