Spectators ran along the peloton with flares on the way from St Jean de Maurienne and Wiggins was among those slightly touched by them.
"I got hit on the arm with a flare, it burnt my arm a little but other than that I'm alright," the Briton told a news conference. "There were quite a few guys running up the hill who lit flares."
The peloton reacted swiftly: "There were quite a few bottles thrown their way," said Wiggins. (Reporting by Julien Pretot; Editing by Alan Baldwin)