After attending a school in Duisburg, he moved to Cologne to work at his father's bicycle shop. There, aged 16, he started biking. In 1926 he turned professional and by then was a top German cyclist. In 1927 he won his first medal at the world championships riding with pacer Christian Junggeburth. In 1929 while driving in a car in Bonn they crashed into a tram. Junggeburth was seriously injured and died several days later in a hospital of blood poisoning.
Krewer died aged 94, nearly forgotten in Cologne. His elder brother Hans was also a cyclist. He died of appendicitis in 1933, aged 20.
References
{{DEFAULTSORT:Krewer, Paul}} 4 : 1906 births|2000 deaths|German male cyclists|Sportspeople from Duisburg