While many leading brand 4WD tyres are made with lighter construction and less tread, Cooper Tires continues to produce strong, deep-tread tyres. Cooper tyres come with a written guarantee to last from 50,000 kilometres to 90,000 kilometres depending upon tire size and pattern. If the guarantee is not met, Cooper credits the shortfall. The result is Cooper Tires are America's most trusted 4WD tyre.