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The branding on the sidewall of a tire is required to list the materials and number of layers of each material used to reinforce the rubber.A typical tire's basic construction materials are usually presented as follows:
|TREAD 2 POLYESTER + 2 STEEL + 1 NYLON||SIDEWALL 2 POLYESTER|
The branding in this example identifies that molded into the rubber under the centerline of the tread lies two radial body plies of polyester cord, two belts of angled steel cord and one circumferential cap ply of nylon cord. It also identifies that in each sidewall at the widest points between the tire's inner and outer sidewalls (tire section width) lies two radial body plies of polyester cord (a continuation of the same two body plies that were listed under the centerline of the tread).
Many high-speed tires use circumferential reinforcements above the steel belts. These are either in the form of belt edge strips (approximately 1-inch wide bands covering only the inner and outer edges of the steel belts), full cap plies (covering the entire width of the steel belts) or a combination of both. However, because belt edge strips are not present under the centerline of the tread, they are never reflected in the basic construction material's branding for the tread area.
Many ultra high performance tires also use fabric or steel cord reinforced sidewalls to increase steering response and cornering stability. However, because sidewall-reinforcing material is not present at the widest points of the tire's sidewalls, they are never reflected in the basic construction materials branding for the sidewall area.
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