Maes was able to win back a little time, and just before the Alps were climbed from stage 15 on, Vietto was still leading, with Maes still in second place, two minutes behind. Sylvère Maes attacked on that stage, and Vietto was not able to follow. Vietto finished 17 minutes behind Maes, and lost the lead. The next stage was split in three split stages. In the first part, Vietto was able to stay close to Maes, but in the second part, the individual mountain time trial, Maes won ten minutes on Vietto. Maes was now leading with a margin of 27 minutes, and the victory seemed secure.