Radial tires containing steel monofilament in the carcass ply

A pneumatic radial tire comprising:

• (a) a pair of axially-spaced-apart annular beads;
• and
• (b) at least one carcass ply which extends between said beads and is folded thereabout wherein at least one of said at least one carcass ply comprises a layer of steel monofilaments arranged so as to have from 25 to 124 ends per inch when measured in a tire circumferential direction at a location having a tire maximum width, each said steel monofilament having
• a tensile strength of at least 3650 MPa,
• a diameter of from 0.1 mm to less than 0.20 mm,
• a total elongation of at least 2%, and
• a torsion value of at least 20 turns with a gauge length of 200 times the diameter of said monofilament.