Pon Holdings, the owner of Gazelle, Derby Cycle and other brands, has announced changes at the head of Pon Bicycle Group. Armin Landgraf is the new chief executive, replacing the retiring Rob Oudshoorn, who has led Pon Bicycle Group since Jan. 1, 2013 and has been a member of the board of Pon Holdings. Landgraf has also been named senior vice president of Pon Holdings. Additionally, Huub Lamers has been appointed chief operating officer of Pon Bicycle Group.