Tour de France 2021: 5 key stages

Russia's Aleksandr Vlasov of Team Astana rides during the Mont Ventoux Denivele Challenge on August 6, 2020, at the Mont Ventoux, southern France. - Mont Ventoux Denivele Challenge is a 182 kms one day race from Vaison-La-Romaine to Mont Ventoux, with nearly 4000 meters of ascending elevation. (Photo by Sylvain THOMAS / AFP) (Photo by SYLVAIN THOMAS/AFP via Getty Images)
The Tour will scale Mont Ventoux for the first time since 2016, scaling it twice (Image credit: Getty Images Sport)

The 2021 Tour de France has a classic look to it, its first week featuring several stages for the sprinters as well as an individual time trial, the final week packed with challenging mountain tests in the Pyrenees that will sort out the contenders for the yellow jersey, which will be decided in a second time trial on the penultimate day. 

With the start of the race in Brest now under a week away, we analyse the five most critical stages in the GC battle.

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Peter Cossins has written about professional cycling since 1993 and is a contributing editor to Procycling. He is the author of The Monuments: The Grit and the Glory of Cycling's Greatest One-Day Races (Bloomsbury, March 2014) and has translated Christophe Bassons' autobiography, A Clean Break (Bloomsbury, July 2014). 

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