ZZ-T-1083 Tire, Pneumatic, Low Speed, Off HighwayThis specification covers new and retreaded pneumatic tires, both tube and tubeless types, and flaps when applicable, for mounting on construction, earthmoving, mining and logging equipment, road graders, mobile cranes, and similar vehicles operated at low speeds off the road.

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ZZ-T-1083F

4.3 EXAMINATIONS, TESTS, AND INSPECTION.

4.3.1 DIMENSIONAL EXAMINATIONS.

4.3.1.1 TIRE OVERALL DIAMETER, TIRE OVERALL WIDTH, AND SKID DEPTH TEST.

4.3.1.1.1 PREPARATION OF TIRE FOR TIRE OVERALL DIAMETER, TIRE OVERALL WIDTH, AND SKID DEPTH TESTS. The tire shall be mounted on the design rim specified by the approximate standardizing body (see 2.2) and inflated to the specified pressure corresponding to the maximum load for its ply rating or symbol for maximum 30 mph speed. The tire shall stand for a minimum of 24 hours at room temperature and the pressure adjusted within 1/2 p.s.i. of the specified pressure.

4.3.1.1.2 TIRE OVERALL DIAMETER. The overall diameter shall be determined to the

nearest 0.01 inch by measuring the outside circumference of the inflated tire with a steel tape and dividing by 3.14 or 3.1416. The diameter may be determined by means of a tape calibrated to directly show tire diameter.

4.3.1.1.3 TIRE OVERALL WIDTH. The tire overall width is the average maximum width of the inflated tire including the sidewalls, side ribs, bars, decorations, letters, or numerals. The width shall be measured to the nearest 0.01 inch at six different points equally spaced around the tire and the results shall be averaged.

4.3.1.1.4 SKID DEPTH. The deepest point of the tread groove nearest to or on the tread centerline of the tire shall be measured to the nearest 0.01 inch at six points equally spaced around the inflated tire and the results shall be averaged. The skid depth shall meet the requirements shown in Table II.

4.3.2 BREAKING ENERGY TEST. Groups 1, 2 and 3 tires shall meet the requirements shown in Table I.

4.3.2.1 PREPARATION OF TIRE FOR BREAKING ENERGY TESTS. The tire shall be mounted on the design rim specified and inflated to the pressure shown for the maximum load at

30 mph. The tire shall be allowed to stand for a minimum of 24 hours at room temperature and

the pressure adjusted within 1/2 p.s.i. of the pressure specified.

4.3.2.2 PROCEDURE. After the tire has been mounted and measured, as specified in 4.3.1.1.2 through 4.3.1.1.5, inclusive, a 1 1/4-inch in diameter cylindrical steel plunger with a hemispherical end shall be forced in the center of the tread portion in the full depth area of the inflated tire (p.s.i. Appendix A), at the rate of two inches per minute. Five measurements of force and penetration at break shall be made at points equally spaced around the circumference