Interpretation ID: nht88-1.42

TYPE: INTERPRETATION-NHTSA

DATE: 02/16/88

FROM: AUTHOR UNAVAILABLE; Erika Z. Jones; NHTSA

TO: Mike Kaizaki -- Manager, Truck Tire Engineering, Yokohama Tire Corporation

TITLE: FMVSS INTERPRETATION

ATTACHMT: 11/1/88 letter from Erika Z. Jones to Gary M. Ceazan (A32; Std. 109; Std. 119); Undated letter from Erika Z. Jones to E.W. Dahl; 8/18/88 letter from Gary M. Ceazan to U.S. Dot (OCC 1951)

TEXT: Mr. Mike Kaizaki Manager, Truck Tire Engineering Yokohama Tire Corporation Corporate Office 601 S. Acacia Fullerton, CA 92631

Dear Mr. Kaizaki:

This responds to your letter requesting an interpretation of Standard No. 119, New Pneumatic Tires for Vehicles Other Than Passenger cars. You asked whether it is permissible to place two tire size designations, 385/65R22.5 in larger letters and 15R22.5 in small letters, on the same tire. The answer to your question is no.

By way of background information, the National Highway Traffic Safety Administration does not provide approvals of motor vehicles or motor vehicle equipment. Under the National Traffic and Motor Vehicle Safety Act, it is the responsibility of the manufac turer to ensure that its vehicles or equipment comply with applicable standards. The following represents our opinion based on the facts provided in your letter.

The practice of labeling two tire sizes on one tire, as you requested in your letter, was once a fairly common practice and was referred to as "dual size markings." Dual size markings were a marketing effort by tire manufacturers to try to persuade consu mers to change the size and/or type of tire on their vehicles, by representing that this particular tire size was an appropriate replacement for two different sizes of tires. However, the practice of using dual-size markings confused many consumers about the size of the tire on their vehicle. The only purpose of the Federally required markings on tires is to provide consumers, in a straightforward manner, with technical information necessary for the safe use and operation of the tire. The agency conclud ed that it was inappropriate to permit a marketing technique that was confusing many consumers to defeat the purpose of the required markings on tires. Accordingly, dual-size markings were expressly prohibited for passenger car tires subject to Standard No. 109: 36 PR 1195, January 26, 1971.

The marking requirements for tires subject to Standard No. 119 are set forth in section 56.5 of the standard. Section @6.5(s) requires that each tire be marked on both sidewalls with the tire size designation as listed in the documents and publications d esignated in @5.1. Section @5.1 of Standard No. 119 requires each tire manufacturer to ensure that a listing of the rims that may be used with each tire the manufacturer produces is available to the public. This may be done either by the individual manuf acturer furnishing a document to each of its dealers, to this agency, and to any person upon request, or the manufacturer may rely on the tire and rim matching information published by certain standardization organizations.

While Standard No. 119 does not expressly prohibit dual-size markings, section @6.5(c) uses the singular when it refers to the "tire size designation" to be labeled on the tire. Considering the past history associated with dual-size markings, this agency interprets section @6.5(c) of Standard No. 119 as prohibiting a manufacturer from marking a tire with two different size designations, even if a document or publication designated in @5.1 were to show two different size designations for the same tire si ze. Sincerely,

Erika Z. Jones Chief Counsel

July 17, 1987

Ms Erika Z. Jones Chief Counsel U.S. Department of Transportation N.H.T.S.A. 400 Seventh St., SW Washington, D.C. 20590

Dear Ms. Jones:

We at Yokohama Rubber Co., LTD are considering the double tire size designations (equivalent but different) marked on the tire sidewall of the medium truck tire.

We believe that it is in compliance with Standard No. 119. New pneumatic tires for motor vehicles other than passenger cars as far as the tire size designations are equivalent to each other and the tire dimensions, and other markings, meet with the estab lished standard, TRA, ETRTO, and so on.

Accordingly, would you respond to our specific question below regarding this marking:

Yokohama places 2 tire size designations, 385/65R22.5 in larger letters and 15R22.5 in small letters. These sizes are different but equivalent to each other. The max load/inflation pressure marking is one specified by ETRTO for 385/65R22.5 but larger tha n one specified by TRA for 15R 22.5.

Is this compatible with FMVSS 119?

I would appreciate your specific response in writing at your earliest convenience.

Thank you for your assistance and cooperation.

Sincerely,

Mike Kaizaki Manager, Truck Tire Engineering