Quote>"Well, the Michelin tires specially developed for the Chiron have been tested up to 470 km / h as a precaution, and even up to 490 km / h at their top. Incidentally, on a tire test bench for aircraft, "no car test bench can achieve these speeds," says Head of Chassis Development Jachin Schwalbe."
Please note original link is in German. I translated it. But the truth does eventually come out! The link is dated in mid 2016 and states the Michelin tyres were tested to 292.044MPH and even higher to 304.472MPH.
This was also reported in the British press the Daily Telegraph a year later to 279MPH plus+ and in the National Geographic Channel documentary BEFORE the Bugatti Chiron went into production in 2016 and on the screen it showed 285.1MPH. So Bugatti ABSOLUTLEY had the tyres for a top speed run for the Bugatti Chiron from before the get go. I guess the Bugatti Chiron Supersport project became more important. I want to know the speed of the stock model!