Here are some more details about this first Grand Prix
About the Renault colour Here is an advertisment from Michelin which shows the colour of the Renault.

(just click to enlarge)
Have a sympathetic look at the poor guys without detachable rim (under the word « amovible » ) who are trying to change their poor tyre while a driver supposed to be Szisz is passing in a triumphant manner !
About the Michelin detachable rim Here are two pictures (taken in the Michelin museum) of such a rim and the different tools necessary to the tyre change, including the octogonal-headed crank which was used in three different ways : a. as a starting handle ; b. for the jack ; c. to screw and unscrew the eight nuts of the rim.


(just click to enlarge. copyright Alain Pernot)
Michelin says that it was the first time that such a polyvalent crank was used.
Q3 : Can we believe them on that point ?
About the controversial authorship of the detachable rim Here is an interesting extract from L’Auto (26/06/1906 edition) published after the scruteenering.
« The bailiffs !!
The bailiffs are here ! It was a long time we didn’t hear about bailiffs, as it’s something usual during the « Salon de l’Automobile » (motorshow). But we got it, this good old bailiff ! He was there to establish (note/state/record ?) the use of detachable rims in the name of the detachable rim’ manufacturer Vinet. Nevertheless, in order not to prejudice the race, Vinet company didn’t order for seizure. »
About tyres (again) Quote
Long before the event, the experts had agreed that the Grand Prix would be a tire race and that the winner would come from such car and driver, who would spend the least time with fitting new tires. The battle would be between Michelin, Dunlop, and Continental.
In his brilliant review, Hans is right talking about Michelin, Dunlop and Continental.
Nevertheless, a fourth tyre manufacturer was involved in that race : Bergougnan « Le Gaulois » .
The Gobron Brillié was the only car to use those tyres made in Clermont-Ferrand (like the Michelins !).
The interesting point (to my view, at least) is that Rigolly (at the wheel of the Gobron Brillié) was the only driver to cover the first day of the race with a single set of tyres. Considering the great number of punctures and tyre changes during that day, it looks like a significant performance !
Vive « Le Gaulois » !!! (sorry, I’m french…)
About the flowers « The ACF Commission Sportive vehemently asks the spectators not to throw flowers to the competitors. A bunch of flowers thrown by the hand of a child becomes a bullet against a car at 130 km/h. So, « houras » if you want but no flowers. »
L’Auto (26/06/1906)
About the fastest laps « Fastest laps » are one of the most significant way to understand a race. So, I think it’s appropriate to have a look to this record for the first Grand Prix ever.
My source is the Mathieson time-sheet. In this document, there are some differences compared to the time-sheet published in « La France automobile » ‘s extract posted by Doug at the start of this thread.
Driver / (Car) / fastest lap / (lap)
Paul Baras(Brasier) 52'25''4(1)
"Pierry"(Brasier) 52'31"0(2)
Arthur Duray(Lorraine-Dietrich) 52'32"2(1)
Ferenc Szisz(Renault) 53'03"0(1)
Dr Aldo Weillschott(Fiat) 53'08"4(2)
Henri Rougier(Lorraine-Dietrich) 53'16"6(9)
Vincenzo Lancia(Fiat) 53'42"4(1)
Jules Barillier(Brasier) 55'23"4(3)
Henri Tart(Panhard-Levassor)55'27"6(4)
Victor Hémery(Darracq) 55'38"4 (2)
George Heath(Panhard-Levassor) 55'39"6(1)
Georges Teste(Panhard-Levassor) 55'48"6(2)
Felice Nazzaro(Fiat) 55'58"8(4)
Louis Wagner(Darracq) 56'13"0(1)
Camille Jenatzy(Mercedes) 56'13"2(2)
Albert Clément(Bayard-Clément) 56'31"0(1)
Elliot Shepard(Hotchkiss) 57'00"8(4)
J Edmond(Renault) 57'32"4 (1)
Claude Richez(Renault) 57'57"6(8)
Vincenzo Florio(Mercedes) 58'35"0(2)
Louis-Emile Rigolly(Gobron-Brillié) 59'15"6(1)
Mariaux(Mercedes) 59'39"2(7)
Hubert Le Blon(Hotchkiss) 1:02'27"8(2)
A Vilemain(Bayard-Clément) 1:04'47"8(5)
Burton(Mercedes) 1:11'34"6(10)
Jacques Salleron(Hotchkiss) 1:19'17"0(2)
"de la Touloubre"(Bayard-Clément) 1:21'09"4(3)
Alessandro Cagno(Itala)1:23'22"0(1)
Baron Pierre De Caters (Itala) 1:59'09"6(1)
Easy to understand how good was the pace of Brasiers, Lorraine-Dietrichs, FIATs and Szisz. For De Caters, we have to specify that he completed only a single lap.
About the… slowest laps ( !!!!) For sure, it will be considered by some of you as a stupid idea. Nevertheless, I think it’s quite interesting to have a look to slowest laps classification. It gives an insight of the difficulty faced by the competitors during this trial.
Driver / (car) / slowest lap / (lap)
Hubert Le Blon(Hotchkiss) 4:19'23"4(1)
Victor Hémery(Darracq) 2:54'31"6(7)
Henri Rougier(Lorraine-Dietrich) 2:43'48"0(10)
Louis-Emile Rigolly(Gobron-Brillié) 2:36'20"2(7)
Mariaux(Mercedes) 2:30'06"4(10)
J Edmond(Renault) 2:27'54"0(5
Alessandro Cagno(Itala) 2:26'23"6(2)
A Vilemain(Bayard-Clément) 2:17'30"6(1
Paul Baras(Brasier) 2:16'26"2(5)
"Pierry"(Brasier) 2:14'35"2(3)
Camille Jenatzy(Mercedes) 2:10'09''2(4)
Arthur Duray(Lorraine-Dietrich) 2:04'21"4(6)
Baron Pierre De Caters (Itala) 1:59'09"6(1)
"de la Touloubre"(Bayard-Clément) 1:52'58"6(2)
Georges Teste(Panhard-Levassor) 1:52'23"0(5)
Vincenzo Florio(Mercedes) 1:46'47"0(5)
Jules Barillier(Brasier) 1:45'20"6(4)
Jacques Salleron(Hotchkiss) 1:43'46"0(1)
Elliot Shepard(Hotchkiss) 1:41'37"4(7)
Burton(Mercedes) 1:34'20"8(12)
Vincenzo Lancia(Fiat) 1:34'20"4(2)
Dr Aldo Weillschott(Fiat) 1:31'55"6(3)
George Heath(Panhard-Levassor) 1:30'07"2(10)
Claude Richez(Renault) 1:28'51"8(7)
Albert Clément(Bayard-Clément) 1:18'35"6(9)
Felice Nazzaro(Fiat) 1:18'21"2(5)
Ferenc Szisz(Renault) 1:11'54"0(12)
Henri Tart(Panhard-Levassor) 1:04'06"8(1)
Louis Wagner(Darracq) 57'09"4(2)
The poor Le Blon deserves a special award for his obstinacy. He had a very difficult first lap : near St Calais he went off and damaged a wheel. During more than three hours he tried to fix it ! He finally succeded in covering the first lap in 4 hours and 19 minutes. In the same duration, Szisz had already covered about 4 lap and a half !!!
The poor Le Blon had to retire after lap 4 because of a wheel (the same one ?). Is it necessary to specify that, at that time, Szisz was resting for two hours ?
The poor Edmond deserves a « hero award ». After he stopped at the end of lap 3 with his eyes being burnt by the tar, he went on for a fourth lap. During 2 hours and a half he tried to go on at the wheel of his Renault in spite of an agonizing pain. After this lap, he had to retire.
The incredible "fast slowest lap" of wagner is due to the fact that he completed only two laps (the two fastests of the race).
About Clément-Bayard Just a detail. Both Hans and Robert wrote « Clément-Bayard » but all the french contemporary sources wrote « Bayard-Clément », including the « La France automobile »’ extract posted by Doug at the start of this thread.
Here is an advertisement published in L'Auto (27/06/1906 edition). As you can see, there is no room for doubt. The bottom line ("Bayard A. Clément, constructeur, Levallois-Perret (Seine)") looks furiously like an official company name and not just a commercial brand for the products.

(just click to enlarge)
It looks like the real name of the company was changed later (in 1907, I think but i’m not able to check it now) to the well-known Clément-Bayard. This change seems to be due to the fact that the british importer started to produce its own cars under the name « Clément-Talbot » and it was considered as more convenient to have two similar names : « Clément-Bayard » for France and « Clément-Tablot » for UK.
It’s interesting to notice that Bayard is the name of a Knight from the Middle Age whose very famous slogan was « fearless, blameless ». Alphonse Clément thaught it was a good slogan for his cars and added the popular Bayard name to his own for naming his new company (when he retrieved from the merge with Gladiator and Humber in 1902).
About the time-keeping Quote
The same company - which was founded by Louis and Émile Mors as "Société d'Électricité Mors" and initially located at 28, Rue de la Bienfaisance, Paris (Téléphones de tous systèmes -Transmetteurs et récepteurs Mors).
Thank you very much for those details, Robert.
Q4 : We can conclude that the mentioned Mors machine was probably a transmitter machine and not the make of the chronometer. Or do you think they made chronomoters, too ?