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Prior to 1964, tires were all made to a 90% aspect ratio. Tire size was specified as the tire width in inches and the diameter in inches – for example, 6.50-15. [29] From 1965 to the early 1970s, tires were made to an 80% aspect ratio. Tire size was again specified by width in inches and diameter in inches.
The all-terrain tire proved more capable than most tires on a hundred-mile off-road trip in the Northern Cascades, but Hogan says it really shines in day-to-day use.
These all terrain tires meet rigorous requirements for off-road performance, on-road ride and handling, noise level, resistance to punctures, wear, quality, and cost.
Some tires, such as the bar grip used on United States military vehicles in World War II, accomplish this by separating the tire into distinct on-road and off-road tread zones. Modern all-terrain tires typically employ hybrid tread patterns and tougher compound to increase the wear life under mixed-surface conditions. [6]
Common types of off-road tires are A/T (All Terrain) and M/T (Mud Terrain). While the A/T tires perform well on the sand, they are less capable in mud. Sand Blaster and Mud bogging tires can be used for the most challenging terrains such as dirt, sand, and water to maintain traction at high angles and speeds (off-road motorsport). [5]
Example of tire sizing on an all-terrain vehicle. Modern road tires have several measurements associated with their size as specified by tire codes like 225/70R14. The first number in the code (e.g., "225") represents the nominal tire width in millimeters. This is followed by the aspect ratio (e.g.,"70"), which is the height of the sidewall ...