Video: Richie Porte predicts first big Giro d'Italia shake up on stage 5

The Giro d'Italia is three weeks long but on stage 5 to Abetone the overall contenders for the maglia rosa will go head-to-head on the first summit finish of this year's race. After the fireworks on stage 4 that saw Fabio Aru, Alberto Contador and Richie Porte lay down a marker the following stage promises to be enough more significant.