Thomas, known for his hardness, pushed on until down until he reached the valley, but he knew something was "bad" and it was confirmed by the team and race doctor.
Porte missed a left-hand bend, cartwheeled across the road and bowled over another rider, Dan Martin, before slamming into a grassy bank.
Thomas began the day second in the general classification, 12 seconds behind his Team Sky teammate Chris Froome, and his exit will come as a major blow for the three-time Tour victor. At the time I was too busy looking for my team auto to get a spare bike.
Martin crashed in to the back of Richie Porte after the Australian went off the road into a wall of rocks on the final descent to the stage finish at Chambery. The Sunweb sprinter was part of the Sunday's large break and battled back after the HC duo of the Col de la Biche and Grand Colombier to win the intermediate sprint and move within 52 points of the Quick-Step Floors rider.
Regardless, the fall obviously ended his race, and he was taken to the hospital to get checked out.
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Colombian Rigoberto Uran of Cannondale-Drapac won the ninth stage, a 181.5-km trek from Nantua.
"I can't really think about that at the moment", Thomas said. It was stage nine as well. I was lying second overall on both days as well.
"I don't know what it is for this year, it's just not happening". "It's just so disappointing". "When I've been told I did, I've felt a lot of happiness".
The numerous crashes led some to question whether the stage was too unsafe. I managed to save myself and contest the stage victory.
Bardet looked destined to pick up a stage win at the home of his Ag2R-La Mondiale team's headquarters, but it was not to be.