Thurau signed a contract to ride the 1978 season as a team leader at IJsboerke. Before his contract started, but after he signed it, he rode the 1977 UCI Road World Championships. Seven kilometers before the finish, he was away together with Francesco Moser, and Moser punctured. To the surprise of commentators, including the coach of the French team Jacques Anquetil and Thurau's team leader Peter Post, Thurau waited for Moser, and was beaten in the sprint by Moser. This caused rumours that Thurau had sold the championship to Moser; it later became clear that Thurau's new bosses at IJsboerke did not want Thurau to ride in the rainbow jersey, but wanted him to keep his sponsored jersey.