• Team: Sky
• Best result: Winner (2013, 2015, 2016)
The Briton, 32, remains the favourite despite a poor season - his best result was fourth at the Criterium du Dauphine last month. He will still be able to count on the Sky armada but the Kenyan-born rider looks more vulnerable than ever.
• Team: Movistar
• Best result: 2nd (2013, 2015)
The Colombian, 27, is always considered a favourite but will need to be more aggressive if he is to win. In May's Giro d'Italia, he showed good form to end second despite again being conservative.
• Team: BMC
• Best result: 5th (2016 )
Questions have long been asked of the Australian's ability to ride consistently over three weeks despite a stellar record in one-week races. Last year, a puncture and a crash into a motorbike led to his fifth spot. The 32-year- old is in the best form of his life, having finished second at the Dauphine last month.
• Team: AG2R
• Best result: 2nd (2016 )
A great climber and descender the AG2R leader is also consistent, finishing 15th, sixth, ninth and second at the Tour over the last four years. The 26-year-old Frenchman's one failing is that he has not won a major race and he is perhaps not daring or aggressive enough.
• Team: Astana
• Best result: 7th (2013)
In four of the previous five years, the winner of the Dauphine (Bradley Wiggins once, Froome three times) has gone on to win the Tour. The 32-year-old Dane's Dauphine win this year was a surprise. It will be interesting to see how he copes as team leader.