Radial tires having at least two belt plies reinforced with stee

Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube

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152451, 152526, 152532, B60C 918, B60C 920

Patent

active

058581375

ABSTRACT:
A pneumatic radial tire includes at least two belt plies reinforced with steel monofilaments inclined at an angle of 10.degree. to 30.degree. with respect to the equatorial plane of the tire, the monofilaments being laid at an end count ranging from 25 to 60 ends per inch and having a diameter of from 0.25 to 0.40 mm, a tensile strength of at least 4080 MPa-(2000.times.D).times.95 percent where D is the filament diameter in millimeters and a fatigue resistance of at least 3500 cycles as measured by the three-roll bending fatigue test. Preferably, the filament diameter ranges from 0.30 to 0.35 mm, the tensile strength of each monofilament is at least 4400 MPa-(2000.times.D).times.95 percent and the fatigue resistance ranges from 3500 to 6000 cycles.

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