Interpretation ID: 1985-01.37

TYPE: INTERPRETATION-NHTSA

DATE: 02/26/85

FROM: AUTHOR UNAVAILABLE; Frank Berndt; NHTSA

TO: Mr. Giorgio Kirchner Federazione Italiana Fuoristrada

TITLE: FMVSS INTERPRETATION

TEXT:

AIR MAIL

Mr. Giorgio Kirchner Segreteria Generale Federazione Italiana Fuoristrada 20131 Milano Via Capranica, 4 ITALY

Dear Mr. Kirchner:

This responds to your letter asking for information about U.S. Federal laws covering tires. For your information, I have enclosed a copy of a letter I sent to a Brazilian tire manufacturer last year, explaining all of the requirements which must be satisfied by a foreign manufacturer selling tires in the United States and enclosing copies of the pertinent regulations.

You stated that you were particularly interested in knowing the meanings and the corresponding values of identification symbols required to appear an sidewalls of tires subject to Standard No. 119. You listed as examples of symbols you were interested in load range and "P.R."

The load range is a letter between "A" and "N", with an A being the lowest load range and N being the highest. Load ranges are designed to tires for use on motor vehicles other than passenger cars because such tires may have identical physical dimensions and, therefore, identical size designations, but widely differing load-carrying capabilities. To ensure that these tires are used only in situations where their load-carrying capability is sufficient, section S6.5(j) of Standard No. 119 requires a letter designating the load range to appear on the sidewall of each tire for use on motor vehicles other than passenger cars. If you are interested in learning the load-carrying capability of the load ranges assigned to a particular tire size, you should contact one of the standardization organizations listed in section S5.1(b) of the enclosed copy of Standard No. 119.

I believe that the symbol "P.R." refers to the ply rating for a tire. The ply rating is an older system which performed the same function now served by the load range. Under the ply rating system, tires were rated from 2 to 24 plies, with the lower numbers indicating a lesser load-carrying capability. Standard No. 119 does not require that a ply rating appear on the sidewall of tires. I have enclosed a copy of a page from the most recent yearbook published by the American standardization organization, the Tire a Rim Association, which shows how to convert a ply rating to the appropriate load range.

If you need further information or have any questions on the enclosed materials, please feel free to contact me.

Sincerely,

Original Signed By

Frank Berndt Chief Counsel

Enclosures

U.S. DEPARTMENT OF TRANSPORTATION 407 7th St. S.W. WASHINGTON D.C. 20580 (Stati Uniti)

Milano, 27.12.84

Re : U.S. Federal Laws covering Tires

Dear Sirs,

We should like to receive information covering the above mentioned U.S. Federal Laws and the one named FMVSS119.

We are particularly interested in knowing the readings (and the corresponding values) of identification symbols carried on tire sidewalls, i.e.:

Load Range, P.R., etc.

We thank you for your assistance.

We remain Yours faithfully Federazione Italiana Fuoristrada Segreteria Generale Giorgio Kirchner