In the final 200 meters, however, when the race ended on a steep climb, Aru took his shot and was able to spring ahead of Froome, who had won the yellow jersey in Stage 8, to beat him by 20 seconds.
Aru collected bonus seconds for his placing and now leads Froome by six seconds in the general classification.
The Team Dimension Data rider had been part of a 12-man break which went away early on the stage, and the two-time Tour stage victor attacked solo on the climb of the Port de Bales.
Chris Froome cracked during a gruelling climb to the finish and lost the overall lead in the Tour de France to Fabio Aru on Thursday (Friday NZ Time) after a demanding stage won by Romain Bardet. "But I didn't have the legs to follow". "My teammates did such an awesome job but I didn't have the legs at the end to finish it off". If I'm doing a bike race, I always try to make it as easy as possible and save my legs as much as I can.
Flash flood watch in effect through Friday morning
A severe thunderstorm warning and flash flood alert has been issued for the same area through late Thursday night. At Toledo Express Airport, a cluster of thunderstorms dropped 1.47 inches between 4 and 7 a.m.
The arrival of the 214,5 km, Bardet has the lead by 2 seconds Uran and Aru. "I've read the book, it's something in British Cycling history that we know a lot about", he said of Simpson, the 1965 world champion and first Brit to wear the Tour's yellow jersey.
Astana rider Fabio Aru chases Team Sky's Chris Froome in Stage 12.
As impressive as Aru has been in the Tour so far, he and Astana received a double blow on Wednesday as a result of a crash in the feed zone on the road to Pau, where Marcel Kittel collected his fifth stage win of this year's Tour.
"Today was a chance, I just needed the right combination", the 36-year-old said.
Lonzo Ball had his best game after ditching Big Baller Brand
Boston has been the best team in the tournament and Philadelphia competed well with them last night. If Ball and his teammates perform as they did tonight, they will be very hard to beat.
Froome's teammates rode at the front with Aru's squad just behind, but showed no interest in reducing the gap with the breakaways.
Britain's Steve Cummings (Dimension Data) was the last man standing from the break after riding away from Thomas De Gendt (Lotto Soudal) and Cyril Gautier (Ag2R-La Mondiale) on the HC climb of the Port de Bales - the fourth of seven categorised climbs in the tough opening stage of a Pyrenean double-header.
Nairo Quintana had already been dropped as the Colombian struggled to recover from the Giro d'Italia.
American Airlines' intense dispute with Etihad and Qatar just got worse
The proposed investment would not change American Airline's "board, governance, management or strategic direction", it said. Delta's senior vice president of in-flight service, Allison Ausband, called Al Baker's remarks "rude" and "misogynistic".