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 ProConnect B10 features the Bosch Performance Line drive unit with a big 500Wh battery and Shimano 10-speed derailleur gears.