Interpretation ID: NCC-240112-Goodyear Tire and Rubber Co.

August 8, 2024

Mark Cherveny
Manager, Global Relations, Standards & Compliance The Goodyear Tire & Rubber Company
200 Innovation Way
Akron, OH 44316-0001 

Dear Mr. Cherveny: 

This letter responds to Goodyear Tire & Rubber Company’s “Letter of Interpretation Request for § 571.139 S5.5(c): maximum inflation pressure,” which states that your company has received requests from original equipment vehicle manufacturers to stamp “350 kPa” on “Extra Load” passenger tires. Your request seeks clarification on whether your company is “permitted to stamp an Extra Load passenger tire with a maximum permissible inflation pressure of 350 kPa.” It then asks: “If this is permitted, then would the minimum breaking energy specified in [49 C.F.R.] § 571.109 Table I-C and the test inflation pressures specified in § 571.109 Table II – Test Inflation Pressures … still apply for strength testing?” 

In responding to this request, the National Highway Traffic Safety Administration (NHTSA) notes that the contents of this letter do not have the force and effect of law and are not meant to bind the public in any way. This letter is only intended to provide clarity regarding existing requirements under the law at the time of signature. 

As to your question whether “Extra Load” tires may be labeled as 350 kPa, NHTSA’s Federal Motor Vehicle Safety Standards (FMVSS) have no labeling requirements based on whether a passenger car tire is extra load or standard load. Thus, the FMVSS do not prohibit the proposed labeling on passenger car tires.1 

As to your question about the minimum breaking energy and inflation pressure tests in FMVSS No. 109, the testing requirements in Table I-C and Table II are based on a tire’s maximum inflation pressure and make no reference to whether the tire is labeled as standard load, extra

1 This letter, like your request, focuses solely on the FMVSS. Whether the proposed labeling complies with any other federal or state law or standards is outside the scope of this letter and we take no position on that question.

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Mr. Mark Cherveny 

load, or XL.2 Thus, passenger car tires with a maximum inflation pressure of 350 kPa are subject to the inflation pressures indicated for 350 kPa tires in the testing requirements set forth in Tables I-C and II. 

We note that your request did not inquire how the testing requirements in FMVSS 139, as opposed to those in FMVSS 109, apply to 350 kPa tires that have been stamped “Extra Load.” Because you did not request an interpretation of the testing standards in FMVSS 139, this letter does not provide such an interpretation. 

Finally, as you note in your letter, FMVSS No. 138—unlike FMVSS 109 and 139—does refer to the maximum inflation pressures for both standard load and extra load tires. The U.S. Tire Manufacturers Association has requested that NHTSA amend FMVSS No. 109 and 139 “to clarify marking and testing based on load classification,” and that it specifically clarify “whether 350 kPa is acceptable as a ‘Maximum Permissible Inflation Pressure’ marking for XL tires.”3 NHTSA is considering that request. However, as they currently stand, the testing requirements in Tables I-C and II of FMVSS 109 make no reference to load classification and are based solely on a tire’s maximum inflation pressure. 

I hope this information is helpful. If you have any further questions, please feel free to contact David Jasinski of my office at (202) 366-2992.

Sincerely,
ADAM RAVIV
Adam Raviv Chief Counsel

Dated: 8/8/24
Ref: Standard No. 109

2 FMVSS No. 109 has never referred to the terms “standard load,” “extra load,” or “reinforced” tires. 58 FR 59227 (Nov. 8, 1993).
3 See Docket No. NHTSA-2019-0011-0017.