Change is inevitable, but it’s important to time it right. Michelin claims its tyres deliver safe performance down to the legal tread depth limit of 1.6mm and considers changing tyres beforehand unnecessary, costly to motorists and fleets, and harmful to the environment. The tyre maker has heavily promoted this point of view in recent times, but its message isn’t finding an audience with everyone. In a statement issued today, GEM Motoring Assist recommends that motorists change their tyres earlier.