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The Curious Bag
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Belted tires have additional layers, or belts, of protective cords beneath the treads. These belts, typically made of steel wire, encircle the tire, providing extra strength and protection.
Material
Most tire belts are made from steel, although fiberglass, nylon, polyester or rayon may also be used.
Types
Belts can be used on either bias tires, which have belts running diagonally to the center tread line, or radial tires, which have belts running at a 90-degree angle to the tread line.
Benefits
Belted tires are stronger and more resistant to impact and puncture damage. The belts also stiffen the tire tread, reducing the amount of squirm against the road.
Considerations
When patching a punctured belted tire, it's important to fill the entire path that the object took when entering the tire. If the entire path is not filled, moisture can reach the belted cords, causing them to rust or deteriorate.
History
Michelin unveiled steel-belted radial tires in 1948, first introducing them to the European marketplace.
Source:
Tirerack.com: Flat Tire Repairs
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