Post rode his first six-day in 1956 and his first victory came in 1957 in Chicago, partnered by Harm Smits.
Post had three partners with whom he had most success.
In 1960 he teamed with Rik Van Looy and won ten sixes.
In 1963 he formed his most successful partnership with the Swiss Fritz Pfenninger and they had 19 victories until 1967, when Post joined the Belgian Patrick Sercu, with whom he had 14 victories up to 1971 and his final and 65th six-day in Frankfurt.
Post's 65 six-day wins stood as a record for a few years, beating Rik Van Steenbergen's 40 wins when at the Milan six in 1968 when partnered by Gianni Motta.
However, since then René Pijnen (72 wins), Danny Clark (74 wins) and Patrick Sercu (88 wins) have all passed Post's total with Sercu as the new record holder.

Post won the Dutch individual pursuit championships six times between 1957 and 1963.
He took 14 European track titles (mostly madison and derny races).
In 1965 in Antwerp he set the derny-paced hour record of 63.783 km, beating Stan Ockers' record which had stood for nine years.
Post rode his first six-day in 1956 and his first victory came in 1957 in Chicago, partnered by Harm Smits. Post had three partners with whom he had most success. In 1960 he teamed with Rik Van Looy and won ten sixes. In 1963 he formed his most successful partnership with the Swiss Fritz Pfenninger and they had 19 victories until 1967, when Post joined the Belgian Patrick Sercu, with whom he had 14 victories up to 1971 and his final and 65th six-day in Frankfurt. Post's 65 six-day wins stood as a record for a few years, beating Rik Van Steenbergen's 40 wins when at the Milan six in 1968 when partnered by Gianni Motta. However, since then René Pijnen (72 wins), Danny Clark (74 wins) and Patrick Sercu (88 wins) have all passed Post's total with Sercu as the new record holder.
Post won the Dutch individual pursuit championships six times between 1957 and 1963. He took 14 European track titles (mostly madison and derny races). In 1965 in Antwerp he set the derny-paced hour record of 63.783 km, beating Stan Ockers' record which had stood for nine years.
Peter Post