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Only the heavy motorcycles with propelled sidecar wheel BMW R 75 and Zündapp KS 750 were classified as schweres Kraftrad - heavy motorcycle, abbreviated s. Krad. They had a dead weight of about 400 kg and were propelled by engines with a capacity of about 750 ccm. (Photo: German federal archive via Wikimedia Commons; License: Creative Commons BY-SA-3.0-gb)
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