[2] Although the 1925 Grand Prix was held to the same technical regulations as in 1924, with cars allowed a maximum of 2-litre engine capacity, there were several important changes for 1925.

For the first time the French Grand Prix was not held on public roads, instead being held at the newly built Autodrome de Linas-Montlhéry which consisted of part of a high banked oval along with an artificial road circuit, a combination initially quite unpopular with the drivers.

[3] Another important change for 1925 was the introduction of the World Manufacturers' Championship, held over four races in 1925, the French Grand Prix being the third.

French hopes mainly rested on Delage, hoping to make up for their disappointment in Belgium, with four of their now supercharged V12 cars entered to be driven by Robert Benoist, Albert Divo and Louis Wagner, with the fourth car for Paul Torchy withdrawn.

By the end of the first lap, Ascari had pulled a sizable lead from Divo, with Masetti, Wagner and Campari passed Segrave, who was followed by Brilli-Peri, Benoist and Conelli.

Brilli-Peri overtook Wagner putting him into third, but was retaken on lap 3 dropping him to fourth ahead of Masetti in the best placed Sunbeam.

[3][4] Shortly after this, came tragedy: light rain had started to fall and Ascari misjudged the fast left hand corner on the return leg of the lap, brushing the fence on the inside causing the car to turn over, throwing him out then crushing him.

This left Divo well in the lead from Masetti and Constantini in the fastest of the Bugattis, followed closely by Torchy, now driving Wagner's Delage.

Divo handed the lead Delage back to Benoist at the last stop, allowing him to take the win from Wagner and Torchy, and Masetti in third, followed at some distance by all five Bugattis, the last of which, Foresti, over an hour behind.