The above quote is from an article of a co-founder of the VanMoof Dutch e-bike brand notorious of making illegal e-bikes. "Our riders being stopped by the police..." Chantelle: you live in Germany. Behave.
You can neither increase voltage nor power on a manufactured Euro e-bike. Yet, the max power of most of mid-drive motor Euro e-bikes greatly exceeds 250 W. For example, the most premium Specialized motors get to 520 W in peak. Combined with drive-train, you'll find no hill you couldn't climb, like the one I climbed on my Vado 5.0:
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Specialized has released now Turbo Tero, a "mountainized" e-bike capable of riding both in urban and off-road terrain, equipped with the same motor as Vado 5.0.
You seem not to be aware how people in Germany think and behave Chantelle. You options are:
- Accepting the reality of life and do what millions of your German neighbours do: ride a 25 km/h e-bike, or
- Buy yourself a S-Pedelec (for instance Specialized Vado 6.0, Trek Allant+ 8S, etc), register it, get a number plate, insure the e-bike, ride with traffic, wear the helmet and carry a driving license as I do with my main e-bike, or
- Go illegal and bear consequences: It is easier to be fined or put in the front of the court in Germany than anywhere else.
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My answer to the speed restriction: A Specialized S-Pedelec, a 45 km/h e-bike. Yes, it carries a number plate. It is liability insured and all.