Tour de France 2020 time trial: Roglič vs Pogačar, TT bike or road bike, and how many watts will decide the winner? 

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Tadej Pogačar (left) and Primož Roglič go head-to-head in the Tour de France time trial (Picture: Justin Setterfield/Getty Images

After three weeks of brutal racing, the 2020 Tour de France comes down to one final test – an uphill time trial on La Planche des Belles Filles.