ASTM F1502-05

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Designation:F1502–05
Standard Test Method for
Static Measurements on Tires for Passenger Cars, Light
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Trucks, and Medium Duty Vehicles
This standard is issued under the fixed designation F 1502; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 overall width, n—the maximum cross-sectional width
of a tire, including protective or decorative ribs.
1.1 This test method covers methods for performing certain
3.1.3 tire weight, n—the weight of an unmounted tire
mechanical static measurements on tires. The term “static”
without tube or flap.
implies that the tire is not rotating while measurements are
3.1.4 tread arc width, n—the length of the arc measured
being made.
from one extreme of the tread design proper to the opposite
1.2 The values stated in SI units are to be regarded as the
extreme; that is, from shoulder to shoulder perpendicular to the
standard. The values given in parentheses are for information
circumferential center line.
only.
3.1.5 tread hardness, n—the hardness of an element in the
1.3 This standard does not purport to address all of the
tread design as measured by a designated standard gage.
safety concerns, if any, associated with its use. It is the
3.1.6 tread radius, n—the radius of a circle whose arc best
responsibility of the user of this standard to establish appro-
fits the tread surface when the radius template used is held
priate safety and health practices and determine the applica-
perpendicular to the circumferential center line of an inflated
bility of regulatory limitations prior to use.
tire.
2. Referenced Documents
3.2 For additional definitions of terms used in this test
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method, refer to Terminology F 538.
2.1 ASTM Standards:
D 2240 Test Method for Rubber Property—Durometer
4. Significance and Use
Hardness
4.1 Static measurements of tires are important to tire manu-
F 421 Test Method for Measuring Groove and Void Depth
facturers, processing engineers, and vehicle design engineers
in Passenger Car Tires
for purposes of commerce (in consumer/vendor agreements)
F 538 Terminology Relating to the Characteristics and Per-
and in tire research and development.
formance of Tires
4.2 The procedures are sufficiently detailed to achieve
F 870 Practice for Tread Footprints of Passenger Car Tires
commercially acceptable reproducibility among laboratories
Groove Area Fraction and Dimensional Measurements
and may therefore be used for specification, compliance, or
F 1082 Practice for Tires—Determining Precision for Test
reference purposes.
Method Standards
4.3 Changes attributable to growth after inflation may be
3. Terminology obtained by comparing measurements made immediately after
inflation with those made 18 to 24 h later.
3.1 Definitions:
3.1.1 outside diameter, n—the maximum diameter of a tire
5. Tire Marking
when it is mounted and inflated.
5.1 For measurements other than weight, the tire shall be
marked at six equally spaced locations around the circumfer-
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This test method is under the jurisdiction of ASTM Committee F09 on Tires
ence. Starting at the DOTserial, make radial lines from bead to
and is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-
bead, perpendicular to the tread center line, at 60-degree
Vehicular) Testing.
intervals. Number the resulting sections “1” through “6” in a
Current edition approved Jan. 1, 2005. Published January 2005. Originally
approved in 1994. Last previous edition approved in 1999 as F 1502 – 94 (1999).
clockwise sequence as viewed from the side containing the
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
serial number.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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F1502–05
oxbow (Fig. 1)), at any circumferential location. Use a thumb-
tack if necessary. See Fig. 2.
6.2.5 Carefully align the tape around the tire circumference
so that it is parallel to the plane of the tread center line. Read
and record the indicated diameter.
6.3 Overall Width:
FIG. 1 Type C: Tread Contour with a Center-Low Oxbow
6.3.1 Mount and condition the test tire as in 6.2.1-6.2.3.
6.3.2 Use an outside caliper or other direct-reading device
that is graduated in 0.25 mm (0.01 in.). See Figs. 3 and 4.
6.3.3 The measured overall width shall include protective
side ribs, bars, and decorations.
6.3.4 Section width can be
...