ASTM F1502-05(2010)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F1502 − 05(Reapproved 2010)
Standard Test Method for
Static Measurements on Tires for Passenger Cars, Light
Trucks, and Medium Duty Vehicles
This standard is issued under the fixed designation F1502; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) 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
being made.
3.1.4 tread arc width, n—the length of the arc measured
from one extreme of the tread design proper to the opposite
1.2 The values stated in SI units are to be regarded as
extreme;thatis,fromshouldertoshoulderperpendiculartothe
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
responsibility of the user of this standard to establish appro-
3.1.6 tread radius, n—the radius of a circle whose arc best
priate safety and health practices and determine the applica-
fits the tread surface when the radius template used is held
bility of regulatory limitations prior to use.
perpendicular to the circumferential center line of an inflated
tire.
2. Referenced Documents
3.2 For additional definitions of terms used in this test
2.1 ASTM Standards:
method, refer to Terminology F538.
D2240Test Method for Rubber Property—Durometer Hard-
ness
4. Significance and Use
F421Test Method for Measuring Groove and Void Depth in
4.1 Static measurements of tires are important to tire
Passenger Car Tires
manufacturers, processing engineers, and vehicle design engi-
F538Terminology Relating to the Characteristics and Per-
neers for purposes of commerce (in consumer/vendor agree-
formance of Tires
ments) and in tire research and development.
F870Practice for Tread Footprints of Passenger Car Tires
4.2 The procedures are sufficiently detailed to achieve
Groove Area Fraction and Dimensional Measurements
commercially acceptable reproducibility among laboratories
F1082Practice for Tires—Determining Precision for Test
and may therefore be used for specification, compliance, or
Method Standards (Withdrawn 2005)
reference purposes.
3. Terminology
4.3 Changes attributable to growth after inflation may be
3.1 Definitions:
obtained by comparing measurements made immediately after
3.1.1 outside diameter, n—the maximum diameter of a tire
inflation with those made 18 to 24 h later.
when it is mounted and inflated.
5. Tire Marking
5.1 For measurements other than weight, the tire shall be
This test method is under the jurisdiction of ASTM Committee F09 on Tires
and is the direct responsibility of Subcommittee F09.30 on Laboratory (Non-
marked at six equally spaced locations around the circumfer-
Vehicular) Testing.
ence.StartingattheDOTserial,makeradiallinesfrombeadto
Current edition approved Dec. 1, 2010. Published March 2011. Originally
ε1 bead, perpendicular to the tread center line, at 60-degree
approved in 1994. Last previous edition approved in 2005 as F1502–05 . DOI:
10.1520/F1502-05R10. intervals. Number the resulting sections “1” through “6” in a
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
clockwise sequence as viewed from the side containing the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
serial number.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
The last approved version of this historical standard is referenced on
www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1502 − 05 (2010)
FIG. 1 Type C: Tread Contour with a Center-Low Oxbow
FIG. 3 Overall Width Measurement
6.2.4 Anchor the end of a “diameter” (pi) tape in the tread
center(orothermaximumdiameterlocation,thatis,centerlow
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
FIG. 2 Outside Diameter Measurement
and record the indicated diameter.
6.3 Overall Width:
6.3.1 Mount and condition the test tire as in 6.2.1 – 6.2.3.
6. Procedures 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.
6.1 Tire Weight:
6.3.3 The measured overall width shall include protective
6.1.1 Weighthetesttireonascalewithaccuracyto0.045kg
side ribs, bars, and decorations.
(0.1lb)intherequiredrange.Ascaleof0-90kg(0-200lb)has
6.3.4 Section width can be obtained by subtracting heights
been found to be satisfactory for tires within the scope of this
of sidewall protuberances from the overall width obtained in
test method.
6.3.3.
6.1.2 The scale used should be calibrated with weights
6.3.5 Recordindividualandaverageoverallwidthmeasure-
traceable to the National Institute of Standards Technology
mentsfrom6.3.3tothenearest0.25mm(0.01in.)fromatleast
(NIST).
three equally spaced circumferential locations as marked in
6.2 Outside Diameter:
5.1.
6.2.1 Mountthetesttireonarimofthecorrectdiameterfor
6.4 Tread Radius:
the tire size and the measuring rim width listed for that tire in
6.4.1 Prepare the tire as in 6.2.1 – 6.2.3.
the current yearbook of the Tire and Rim Association (or
5,6
6.4.2 Tread radius templates commonly have radii ranging
applicable document ), unless another width is chosen.
from 120 mm (4.75 in.) to 300 mm (12.0 in.) in 12.8-mm
6.2.2 Inflate the tire to the maximum pressure given on the
(0.50-in.) increments and from 300 mm (12.0 in.) to 900 mm
sidewall unless another pressure has been chosen. Do not
(35.5 in.) in 12.8-mm (0.50-in.) increments. Choose the one
exceed the maximum pressure given on the sidewall. Record
that most closely fits the tread arc defined by one of the
the value used. Allow 24 h for inflation growth and adjust
following types of contour. See Fig. 5.
pressure if necessary.
6.2.3 The assembly of wheel and inflated tire shall be in
NOTE 1—For tires outside or different from these most popular tread
temperature equilibrium with the environment in which the radiuscontours,thatis,extremelowprofiletypes,identifythoseradiithat
most closely define the tread contour.
measurements are to be made. This can usually be achieved in
3 h at room temperature, 24 6 8°C (75 6 15°F). Record
6.4.2.1 Type A Single (Primary) (seeFig. 6)—This type is
ambient temperature at the time of measurements. characterizedbyatreadarcthatcanbeuniformlycontactedby
one of the templates. Choose the one that most closely fits the
arcdefinedbythreepoints,thetreadcenter,andtwoshoulders.
4 Since a perfectly uniform radius is not always attainable, other
Current yearbook of the Tire and RimAssociation available from the Tire and
typical variations are discussed as means for arriving at a best
RimAssociation, Inc., 175 MontroseAvenue, West, Suite 150, Copley, OH 44321.
Current yearbook of the European Tyre and Rim Technical Organization
descriptive fit.
available from the ETRTO, 32 Avenue Brugmann, 1060 Brussels, Belgium.
6.4.2.2 Type B Dual, Drop Shoulder (see Fig. 7)—This type
Current yearbook of the Japan Automotive Tire Manufacturers’ Association
th
is characterized by the inability to fit a single-radius template
Inc. available from JATMA, 8 floor, No. 33 Mori Bldg., 3-8-21 Toranomon
Minato-ku, Tokyo, Japan 105-0001. across the entire tread because of drops at the shoulders.
F1502 − 05 (2010)
FIG. 7 Type B: Tread Contour with a Dual Radius
FIG. 4 Overall Width Measurement
FIG. 8 Type D: Tread Contour with a Center-High Oxbow Style
6.5 Tread Hardness:
6.5.1 Prepare the test tire as in 6.2.1 – 6.2.3.
6.5.2 Mountthetire/wheelunitinatestfixtureorstanditon
a smooth surface so that its wheel axis is parallel to that
surface.
6.5.3 An A-scale durometer hardness gage may be used.
Report the brand name of the one chosen.
6.5.4 Makemeasurementsinsmoothandflatareasofthesix
FIG. 5 Tread Radius Measurement
tread sections marked off in 5.1 (see Fig. 9).Avoid placing the
probe near sipes, mold vents, or edges of tread elements.
6.5.5 Results on crown and shoulder elements should be
recorded separately since they may differ from each other.
6.5.6 Applythegagerapidly,inamannerprescribedinTest
Method D2240, in a direction perpendicular to the tread
surface,usingenoughforcetoensurethatthegateplateliesflat
FIG. 6 Type A: Tread Contour with a Single Radius
against the surface.
6.5.7 Hardness readings should be taken quickly, within 1 s
after the application of force. Report the average hardness
Choose the one that most closely fits the center portion of the
reading, the nearest scale division, for the area measu
...