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Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Proposed Rules
S6.2.2 The road test surface must produce a peak friction coefficient PFC
of 1.02 when measured using an ASTM
F249319 incorporated by reference, see 571.5 standard reference test tire, in accordance with ASTM E133719
incorporated by reference, see 571.5
at a speed of 64.4 km/h 40 mph, without water delivery.

7. Amend 571.135 by revising paragraphs S6.2.1, S7.4.3f, S7.5.2f, S7.6.2f, S7.7.3f, S7.8.2f, S7.9.2f, S7.10.3e, and S7.11.3f to read as follows:
571.135 Standard No. 135; Light vehicle brake systems.

S6.2.1 Unless otherwise specified, the road test surface produces a peak friction coefficient PFC of 1.02 when measured using an ASTM F249319
incorporated by reference, see 571.5
standard reference test tire, in accordance with ASTM E133719
incorporated by reference, see 571.5, at a speed of 64.4 km/h 40 mph, without water delivery.

S7.4.3
f Test surface: PFC of at least 1.02.

S7.5.2
f Test surface: PFC of 1.02.

S7.6.2
f Test surface: PFC of 1.02.

S7.7.3
f Test surface: PFC of 1.02.

S7.8.2
f Test surface: PFC of 1.02.

S7.9.2
f Test surface: PFC of 1.02.

S7.10.3
e Test surface: PFC of 1.02.

S7.11.3
f Test surface: PFC of 1.02.

8. Amend 571.136 by revising paragraph S6.2.2 to read as follows:
khammond on DSKJM1Z7X2PROD with PROPOSALS

571.136 Standard No. 136; Electronic stability control systems for heavy vehicles.

S6.2.2 The road test surface produces a peak friction coefficient PFC of 1.02 when measured using an ASTM F249319 standard reference test tire, in accordance with ASTM E1337
19, at a speed of 64.4 km/h 40 mph,
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16:19 Aug 04, 2021

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without water delivery both documents incorporated by reference, see 571.5.

9. Amend 571.139 by revising the definition of Snow tire in S3 to read as follows:
571.139 Standard No. 139; New pneumatic radial tires for light vehicles.

S3
Snow tire means a tire that attains a traction index equal to or greater than 112, compared to the ASTM F249319
incorporated by reference, see 571.5
Standard Reference Test Tire when using the snow traction test on the medium pack snow surface as described in ASTM F180520 incorporated by reference, see 571.5, and that is marked with an Alpine Symbol specified in S5.5i on at least one sidewall.

10. Amend 571.500 by revising paragraph S6.2.1 to read as follows:
571.500
vehicles.

Standard No. 500; Low-speed

S6.2.1 Pavement friction. Unless otherwise specified, the road test surface produces a peak friction coefficient PFC of 1.02 when measured using a standard reference test tire that meets the specifications of ASTM
F249319, in accordance with ASTM
E133719, at a speed of 64.4 km/h 40.0
mph, without water delivery both incorporated by reference; see 571.5.

PART 575CONSUMER
INFORMATION
11. The authority citation for part 575
of title 49 continues to read as follows:

Authority: 49 U.S.C. 32302, 32304A, 30111, 30115, 30117, 30123, 30166, 30181, 30182, 30183, and 32908, Pub. L. 104414, 114 Stat. 1800, Pub. L. 10959, 119 Stat.
1144, Pub. L. 110140, 121 Stat. 1492, 15
U.S.C. 1232g; delegation of authority at 49
CFR 1.95.

12. Amend 575.3 by revising paragraph c to read as follows:

575.3

Matter incorporated by reference.

c ASTM International ASTM, 100
Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 194282959, 610
8329500, https www.astm.org/.
1 ASTM E 50108 ASTM E 501, Standard Specification for Standard Rib Tire for Pavement Skid-Resistance Tests June 2008, IBR approved for 575.104 and 575.106.
2 ASTM F249319 ASTM
F2493, Standard Specification for
PO 00000

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P225/60R16 97S Radial Standard Reference Test Tire, approved Oct. 1, 2019, IBR approved for 575.104.

13. Amend 575.104 by revising paragraphs e2viii introductory text, e2viiiA through E, and e2ixA2, the note to paragraph e2ixC, and paragraph e2ixF
to read as follows:
575.104 Uniform tire quality grading standards.

e
2
viii Drive the convoy on the test roadway for 16 circuits approximately 6,400 miles.
A After every circuit approximately 400 miles, rotate each vehicles tires by moving each front tire to the same side of the rear axle and each rear tire to the opposite side of the front axle. Visually inspect each tire for treadwear anomalies.
B After every second circuit approximately 800 miles, rotate the vehicles in the convoy by moving the last vehicle to the lead position. Do not rotate driver positions within the convoy. In four-car convoys, vehicle one shall become vehicle two, vehicle two shall become vehicle three, vehicle three shall become vehicle four, and vehicle four shall become vehicle one.
C After every second circuit approximately 800 miles, if necessary, adjust wheel alignment to the midpoint of the vehicle manufacturers specification, unless adjustment to the midpoint is not recommended by the manufacturer; in that case, adjust the alignment to the manufacturers recommended setting. In all cases, the setting is within the tolerance specified by the manufacturer of the alignment machine.
D After every second circuit approximately 800 miles, if determining the projected mileage by the 9-point method set forth in paragraph e2ixA1 of this section, measure the average tread depth of each tire following the procedure set forth in paragraph e2vi of this section.
E After every fourth circuit approximately 1,600 miles, move the complete set of four tires to the following vehicle. Move the tires on the last vehicle to the lead vehicle. In moving the tires, rotate them as set forth in paragraph e2viiiA of this section.

ix
A
2 Two-point arithmetical method. i For each course monitoring and
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