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If you make a gear tooth that is shaped like an involute curve, then instead of scraping against each other at a sharp corner, the gear teeth will roll smoothly and continuously across each other, across the entire tooth face, producing a smooth and continuous transmission of force with minimal friction

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Nein, das E-Bike-Kit der Marke Yose Power erreicht eine Maximalgeschwindigkeit von 25 km/h, sodass kein Führerschein benötigt wird