Kalkhoff is the largest e-bike manufacturer in Germany by numbers. They have been in the business of building bikes for nearly a century and have developed their own e-bike drive unit, the powerful Impulse system featuring a big battery. Kalkhoff bikes generally provide good value for money and are all designed for urban use, with all the essentials like mudguards, racks and lights standard. Most models come in different frame shapes and a large number of sizes. The Integrale i11 is equipped with the most advanced Impulse drive unit, the Impulse EVO RS, and the Shimano low maintenance Alfine hub with 11 internal gears and electronic shifting.