CAUTERETS, France — Tour de France leader Chris Froome understands those who harbor doubts about his dominant performances in a sport long marred by doping. Maybe, he says, it’s time to bring in an independent specialist to test his body and help prove that he’s riding clean.

The 30-year-old Briton cruised through a second day in the Pyrenees mountains on Wednesday, finishing more than five minutes behind Stage 11 winner Rafal Majka of Poland but keeping his main rivals in check.

The bumpy, grueling ride under a hot sun came a day after Froome blew away the pack, prompting new suspicions about doping.