A lady ex colleague owned a new car for 5 years plus. One day I told her, that her car tyres shows signs of crack and even though still have plenty of thread pattern, it is better that she changed them. She replied then her husband is about to get her a new car, so end of story. But about 2 months later she came and told me this. Her new car came and traded in her old one. The salesman who came to collect the old car from office, drove it off. Half way one of the tyre burst, so she just came to inform me about my warning to her....lol. Actually she drives her car from home to office and back which is a short distance only, that is why after 5 years tyres still plenty of thread pattern. The tyre burst was on the federal highway, where speed was faster and tyre sidewall flex more.....