Amendment from January 06, 2006
49 CFR--PART 571
View Printed Federal Register page
71 FR 886 in PDF format.Amendment(s) published January 6, 2006, in 71 FR 886
Effective Date(s): June 1, 2007, and delay the effective date of the Final Rule published on June 26, 2003 (68 FR 38115) from June 1, 2007 until September 1, 2007.
6. Section 571.139 is amended by:
a. Adding new paragraphs S2.1 and S2.2 to S2; adding to S3, in alphabetical order, new definitions of “Passenger car tire” and “Snow tire” and adding a new paragraph (i) to S5.5;
b. Revising S2; the first sentence of S5.5; S6.1.1.1.2; S6.1.1.1.4; S6.2.1.1.1; S6.2.1.2.6; S6.2.1.2.8; S6.2.2; S6.3.1.1.1; S6.3.1.1.2; S6.3.1.2.2; S6.3.1.2.3; S6.3.1.2.5; S6.3.2; S6.4.1.1.1; S6.4.1.1.2; S6.4.1.2.1; S6.4.1.2.5; S6.4.1.2.6; S6.4.2; S6.5.1; and S6.6 as set forth below.
§ 571.139-- Standard No. 139—New pneumatic radial tires for light vehicles.
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S2 Application and Incorporation by Reference.
S2.1 Application. This standard applies to new pneumatic radial tires for use on motor vehicles that have a gross vehicle weight rating (GVWR) of 10,000 pounds or less, and that were manufactured after 1975. This standard does not apply to tires for use on new pneumatic light truck tires with a tread depth of 18/32 inch or greater; ST, FI and 8–12 rim or lower diameter code tires; tires for use on low speed vehicles; and tires for use on motorcycles manufactured after 1948.
S2.2 Incorporation by reference. ASTM F–1805–00, Standard Test Method for Single Wheel Driving Traction in a Straight Line on Snow- and Ice-Covered Surfaces is incorporated by reference in S3 of this section. The Director of the Federal Register has approved the incorporation by reference of this material in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. A copy of ASTM F–1805–00 may be obtained from the ASTM Web site http://www.astm.org/ or by contacting ASTM, or by contacting ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428–2959. A copy of ASTM F–1805–00 may be obtained from the NHTSA docket at Docket No. 2005–23439, or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202–741–6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
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S3. Definitions.
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Passenger car tire means a tire intended for use on passenger cars, multipurpose passenger vehicles, and trucks, that have a gross vehicle weight rating (GVWR) of 10,000 pounds or less.
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Snow tire means a tire that attains a traction index equal to or greater than 110, compared to the ASTM E–1136 Standard Reference Test Tire, when using the snow traction test as described in ASTM F–1805–00, Standard Test Method for Single Wheel Driving Traction in a Straight Line on Snow- and Ice-Covered Surfaces, and which is marked with an Alpine Symbol specified in S5.5 (i) on at least one sidewall.
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S5.5 Tire Markings. Except as specified in paragraphs (a) through (h) of S5.5, each tire must be marked on each sidewall with the information specified in S5.5 (a) through (d) and on one sidewall with the information specified in S5.5 (e) through (h) according to the phase-in schedule specified in S7 of this standard. * * *
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(i) Alpine Symbol. A tire meeting the definition of a snow tire as defined in paragraph S3 may, at the option of the manufacturer, show the pictograph of a mountain with a snowflake as shown below. If the manufacturer chooses to mark the snow tire with the alpine symbol, the mountain profile must have a minimum base of 15 mm and a minimum height of 15 mm, and must contain three peaks with the middle peak being the tallest. Inside the mountain, there must be a six-sided snowflake having a minimum height of one-half the tallest peak.
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S6.1.1.1.2 For passenger car tires, inflate to the pressure specified in the following table:
------------------------------------------------------------------------ Inflation pressure (kPa)------------------------------------------------------------------------- Standard Reinforced------------------------------------------------------------------------180..................................................... 220------------------------------------------------------------------------
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S6.1.1.1.4 Condition the assembly at an ambient room temperature of 20 °C to 30 °C for not less than 24 hours.
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S6.2.1.1.1 Mount the tire on a test rim and inflate it to the pressure specified for the tire in the following table:
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------------------------------------------------------------------------ Test Tire application pressure (kPa)------------------------------------------------------------------------ Passenger car tires------------------------------------------------------------------------Standard load.............................................. 220Extra load................................................. 260Load Range C............................................... 320Load Range D............................................... 410Load Range E............................................... 500------------------------------------------------------------------------Light truck tires with a nominal cross section > 295 mm (11.5 inches) ------------------------------------------------------------------------Load Range C............................................... 230Load Range D............................................... 320Load Range E............................................... 410------------------------------------------------------------------------
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S6.2.1.2.6 During the test, the ambient temperature, measured at a distance of not less than 150 mm and not more than 1 m from the tire, is maintained at not less than 32 °C or more than 38 °C.
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S6.2.1.2.8 Allow the tire to cool for between 15 minutes and 25 minutes. Measure its inflation pressure. Then, deflate the tire, remove it from the test rim, and inspect it for the conditions specified in S6.2.2(a).
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S6.2.2 Performance requirements. When the tire is tested in accordance with S6.2.1:
(a) There shall be no visual evidence of tread, sidewall, ply, cord, innerliner, belt or bead separation, chunking, open splices, cracking, or broken cords.
(b) The tire pressure, when measured at any time between 15 minutes and 25 minutes after the end of the test, shall not be less than 95% of the initial pressure specified in S6.2.1.1.1.
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S6.3.1.1.1 Mount the tire on a test rim and inflate it to the pressure specified for the tire in the following table:
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------------------------------------------------------------------------ Test Tire application pressure (kPa)------------------------------------------------------------------------ Passenger car tires------------------------------------------------------------------------Standard load.............................................. 180Extra load................................................. 220Load Range C............................................... 260Load Range D............................................... 340Load Range E............................................... 410------------------------------------------------------------------------Light truck tires with a nominal cross section > 295 mm (11.5 inches) ------------------------------------------------------------------------Load Range C............................................... 190Load Range D............................................... 260Load Range E............................................... 340------------------------------------------------------------------------
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S6.3.1.1.2 Condition the assembly at 32 to 38 °C for not less than 3 hours.
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S6.3.1.2.2 During the test, the ambient temperature, at a distance of not less than 150 mm and not more than 1 m from the tire, is maintained at not less than 32 °C or more than 38 °C.
S6.3.1.2.3 Conduct the test, without interruptions, at the test speed of not less than 120 km/h with loads and test periods not less than those shown in the following table. For snow tires, conduct the test at not less than 110 km/h.
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------------------------------------------------------------------------ Load as a percentage Test period Duration of tire (hours) maximum load rating------------------------------------------------------------------------1............................................. 4 852............................................. 6 903............................................. 24 100------------------------------------------------------------------------
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S6.3.1.2.5 Allow the tire to cool for between 15 minutes and 25 minutes after running the tire for the time specified in the table in S6.3.1.2.3, measure its inflation pressure. Inspect the tire externally on the test rim for the conditions specified in S6.3.2(a).
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S6.3.2 Performance requirements. When the tire is tested in accordance with S6.3.1:
(a) There shall be no visual evidence of tread, sidewall, ply, cord, belt or bead separation, chunking, open splices, cracking or broken cords.
(b) The tire pressure, when measured at any time between 15 minutes and 25 minutes after the end of the test, shall not be less than 95% of the initial pressure specified in S6.3.1.1.1.
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S6.4.1.1.1 This test is conducted following completion of the tire endurance test using the same tire and rim assembly tested in accordance with S6.3 with the tire deflated to the following appropriate pressure:
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------------------------------------------------------------------------ Test Tire application pressure (kPa)------------------------------------------------------------------------ Passenger car tires------------------------------------------------------------------------Standard load.............................................. 140Extra load................................................. 160Load Range C............................................... 200Load Range D............................................... 260Load Range E............................................... 320------------------------------------------------------------------------Light truck tires with a nominal cross section > 295 mm (11.5 inches) ------------------------------------------------------------------------Load Range C............................................... 150Load Range D............................................... 200Load Range E............................................... 260------------------------------------------------------------------------
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S6.4.1.1.2 Condition the assembly at 32 to 38 °C for not less than 2 hours.
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S6.4.1.2.1 The test is conducted for ninety minutes at the end of the test specified in S6.3, continuous and uninterrupted, at a speed of 120 km/h (75 mph). For snow tires, conduct the test at not less than 110 km/h.
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S6.4.1.2.5 During the test, the ambient temperature, at a distance of not less than 150 mm and not more than 1 m from the tire, is maintained at not less than 32 °C or more than 38 °C.
S6.4.1.2.6 Allow the tire to cool for between 15 minutes and 25 minutes. Measure its inflation pressure. Then, deflate the tire, remove it from the test rim, and inspect it for the conditions specified in S6.4.2(a).
S6.4.2 Performance requirements. When the tire is tested in accordance with S6.4.1:
(a) There shall be no visual evidence of tread, sidewall, ply, cord, innerliner, belt or bead separation, chunking, open splices, cracking, or broken cords, and
(b) The tire pressure, when measured at any time between 15 minutes and 25 minutes after the end of the test, shall not be less than 95% of the initial pressure specified in S6.4.1.1.1.
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S6.5.1 Tire strength for passenger car tires. Each tire shall comply with the requirements of S5.3 of §571.109.
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S6.6 Tubeless tire bead unseating resistance. Each tire shall comply with the requirements of S5.2 of §571.109. For light truck tires, the maximum permissible inflation pressure to be used for the bead unseating test is as follows:
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------------------------------------------------------------------------ ------------------------------------------------------------------------Load Range C............................... 260 kPa.Load Range D............................... 340 kPa.Load Range E............................... 410 kPa.------------------------------------------------------------------------
