MIL-T-12459E
size of tire applicable to each of the manufacturing facilities where such
tires are proposed to be manufactured. The maximum variation from the
established average weight shall not exceed plus or minus 4% for any of the
tires; tires for which a maximum weight is established shall not exceed the
specified weight (see 4.7.1 and 4.7.2).
3.3.3 Carcass (see 4.7.1 and 4.7.2),
3.3.3.1 Body plies. The body or full plies in each size tire shall
provide it with the load range and ply rating specified in figures 1 and 2.
3.3.3.2 Breaker strips for class CC and MS tires. Not less than two
breaker strips shall be required in class CC and MS tires above size
7.00-16LW.
3.3.4 Sidewall. The sidewall cover shall be designed so resist
moisture, weathering and abrasion. When the tread and sidewall are of
different compounds, the sidewall compound shall not extend closer than 1/2
inch to the tread shoulder (see 4.7.1.1 and 4.7.2).
3.3.5 Bead construction. The bead construction including ply lock, rim
fit, chamfer and number and tensile strength of wires in bead bundle shall
meet all requirements of the operating conditions normal to these classes of
tires (see 4.7.1 and 4.7.2).
3.3.6 Tire flaps for style "a" tires. When style "a" tires are
specified, a flap of the correct size shall be furnished with each tire.
Flap sizes for the tire sizes shall be as specified in Tire and Rim
Association, Inc. Yearbook. The flap shall be of the endless type, and of
such width and form as to fit the tire without buckling or wrinkling (see
4.7.1.4, 4.7.2 and 6.4).
3.3.6.1 Valve hole location. Unless otherwise specified (see 6.2), the
valve hole of all flaps shall be located on the centerline of the flap (see
4.7.1.4 and 4.7.2).
3.3.7 Treadwear indicators. Each tire shall have at least six treadwear
indicators spaced approximately equally around its circumference to enable a
person inspecting the tire to determine visually whether the tire has worn to
a tread depth of 1/16 inch. Except for this indicator or bar height of 1/16
inch, the tread wear indicator shall conform to industry practices for lug
and rib/lug type tires and shall be located in the tread pattern in
conformance with the Tire and Rim Association Engineering Design Information
(see 4.7.1.5).
3.4 Mechanical properties (see 4.7.3).
3.4.1 Tensile strength. The tire tread shall have a tensile strength of
not less than 2000 pounds per square inch (psi), and sidewalls not less than
1300 psi.
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