But the 18th stage will be the crucial one, ending up the lung-busting Col d'Izoard, where the "first big battle of the climbers" will be staged according to LeMond, a Tour winner in 1986, 1989 and 1990:
It will come down to Izoard, it will be the first big battle for climbers to win the Tour. We've never seen a really all-out day of racing since the start. In Peyragudes, they just raced in the last 500 metres.
Wednesday's downhill finish, with a possible headwind, would make it hard for a lone rider to go all the way to the line, according to LeMond.
It's not as explosive as you think (on Wednesday). The Croix de Fer is really hard and the Galibier is really long, but it will be hard to put time into Froome.
Chris Froome leads Italian Fabio Aru by 18 seconds and France's Romain Bardet by 23, with Colombian Rigoberto Uran in fourth place, 29 seconds off the pace.
The Briton has a virtual extra advantage as he is expected to beat his rivals in the final time trial on Saturday.
"It seems everybody will wait until the last day with the mountain-top finish," said LeMond. "I think they will race conservatively tomorrow and wait for the Izoard."