Ko Zieleman

Ko Zieleman (10 January 1933 – 13 April 2021) was a Dutch cyclist and bike frame builder.
As a cyclist Zieleman competed in among others, the 1959 Gent–Wevelgem. He was more known as a frame builder, owning a shop selling bike frames, a trade that his father had started in 1928. He made the frames of top cyclists including Hennie Kuiper, Leo van Vliet, and Michael Boogerd. He also built the bikes for his grandson Dylan Groenewegen, who is now also a high level professional cyclist.
Zieleman died on 12 April 2021, aged 88.