LeMond parlayed the success of his 1989 season into the then-richest contract in the sport's history, signing a $5.5 million deal for three years with Z-Tomasso of France. He entered the 1990 Tour de France as defending champion and a pre-race favorite after leaving ADR to join the much stronger French team. At "Z" his teammates included Robert Millar, Eric Boyer and Ronan Pensec, all of whom already had finishes in the top six of the Tour de France. This unified roster of strong riders appeared capable of supporting LeMond in the mountains and controlling the race on the flats.  The squad's tactical plan was upset on the first day, when a breakaway that included LeMond's teammate Ronan Pensec, but no major favorites, arrived ten minutes ahead of the field. LeMond was prevented from challenging for the lead until the yellow jersey left the shoulders of his teammate. LeMond closed in on race leader Claudio Chiappucci, finally overtaking him in the final individual time trial on stage 20, where he finished over two minutes ahead of the unheralded Italian. LeMond at last had the yellow jersey, wearing it the following day as the Tour rode into Paris. LeMond had the distinction of winning the 1990 Tour without taking any of the individual stages. He remains the last rider to win the Tour while wearing the world champion jersey. Over the course of the 1990 Tour the perceived strength of the Z team was confirmed, as they led the team classification through most of the race, adding the team title to LeMond's yellow jersey.  In September, LeMond attempted to defend his title at the 1990 UCI Road World Championships, but finished fourth, eight seconds behind the winner, his former teammate Rudy Dhaenens of Belgium.

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