I am sure this has been discussed but I can't find it by searching. I know there is a difference in upper speed for Class I bikes between Europe and the U.S. as described:
"Class 1: Pedal Assist
The electric drive system on the ebike can only be activated through a pedaling action and is limited to relatively low speeds. The sensor usually measures pedal movement, pedal torque or bicycle speed (sometimes all three) and sensors are located in the bottom bracket, rear hub or rear wheel. In parts of Europe this class is limited to 15 mph (25 kph) with motor wattage <= 250 watts. In America, because of our more liberal vehicle definition, this class is limited to a motor powered speed of 20 mph (32 kph) with motor wattage of <= 750 watts. Due to the low speed of operation and required pedaling action this class should benefit from the same rights and access privileges as non-assist bicycles and should be able to be used on streets, bike lanes, multi-use bike paths and off-road trails."
And I know that often the same model marketed in Europe has a top speed of 15 mph and in the U.S. that same model has a top speed of 20 mph. Am I correct in assuming in such instances this is a software rather than hardware difference? And can that be changed by a dealer? My specific question: If I get a bike from Europe that is later marketed in the U.S., could a dealer adjust the upper speed? Or would I literally have to buy a new model if I wanted 20 mph? Thanks!