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Think of the tire tread as the component that protects the carcass and provides the surface the vehicle rides on. In measuring a tire's strength the tread area contributes ZERO to the tire's ability to carry it's load. Basically it's just glued/bonded to the carcass.
Almost all the materials that provide a tire's strength - ability to carry it's designed load capacity - are hidden beneath the tire tread area. The first place to look for clues to a tire's well beaning are it's sidewalls, both inner and outer. They will crack and sometimes grow small bubbles. Another more visible clue will be when a tire's running temperature starts to increase higher than the others. Pretty soon it will start to grow taller. A telltale of tread separation.
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