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"To this day, we believe that pneumatic tyres are the best choice for most vehicles," says Denise Sperl, a director of car tyre research and development at Germany's Continental.

In the late 1880s, Scottish inventor John Dunlop supplied the missing part of the puzzle by reinventing the pneumatic tyre, which had been developed few decades previously, but which had failed to take off.

They also developed ball bearings, pneumatic tyres, differential gears and brakes.

Before pneumatic tyres, city streets were full of the deafening clang of metal-rimmed wheels and horseshoes on stone.

So, for now, my son just rides a balance bike, which has no pedals, rather fat pneumatic tyres and only one brake.