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The climb started 43km from the finish and within a kilometre, Carapaz's EF Education team attacked.

A breakaway group of four led until the final climb but once they were hauled in, Carapaz's EF Education-EasyPost set a rapid pace before the Ecuadorian attacked hard.

Wiggins' former team boss Jonathan Vaughters - who now heads the EF Education-EasyPost World Tour team - understands why Wiggins has come across the problems he has.

Teams from 10 different countries will be represented, while EF Education – Oatly and AG Insurance – Soudal will make their debut appearances.

The tornado is on the upper end of the lowest rating of the EF scale, according to Cohen.