All tyres on all cars are black.

There is most certainly a good reason for this; but it doesn’t have to be.

Once  it was impossible to use anything but freon in refrigerators.  But it isn’t.

Once it was impossible to sell coffee filters that weren’t white.  But not today.

Once every telephone had to be tied down with a cord.  But not nowadays.

So why not make them blue?  or red?  or flowery and spotted?