What year was Lance Armstrong's toughest tour de France that he won?

Answer 1

Probably the 2003 edition. In the mid to late stages where he was known to have minutes on rivals, cyclists Jan Ulrich and Alexander Vinokourov were within seconds of Lance in overall time.

He also had to deal with a dehydration problem during the tour's second individual time trial, to which he lost a minute and 36 seconds to Jan Ulrich, almost costing him his lead in the mountain stages that followed. Notable was stage 13, Toulous (Cite de l'Espace) to Plateau da Bonascr, a mountain stage in which Lance was attacked and dropped, something that had never been done during Lance's tour victories in the past.

He won with barely over a minute of time ahead of Ulrich, whereas the tours before he had at least six minutes on the rest of the overall classification.