4.1k Views. Education has been proved to be and holds the key to life and Zimbabwe`s very own President Robert Mugabe tops as the most educated President the World has ever seen. Zimbabwe also has a very high literacy rate, one of Zimbabwe`s pride.
An old tire poses a safety hazard. For some people, old tires might never be an issue. If you drive a typical number of miles, somewhere around 12,000-15,000 miles annually, a tire's tread will wear out in three to four years, long before the rubber compound does. But if you only drive 6,000 miles a year, or have a car that you only drive on weekends, aging tires could be an issue.
Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified the tire width in inches and the diameter in inches-for example 6.50-15. From 1965 to the early 70's, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.