Michelin developing ultra high-speed tyres, alternative materials

French tyre maker Michelin is currently developing a tyre capable of cracking a mind-blowing 482km/h (300mph), which would allow street-legal hyper-cars like the Bugatti Chiron and Koenigsegg Agera RS to exceed higher straight-line speeds than what they have officially recorded to date (431km/h and 447.2km/h respectively).