Interpretation ID: nht94-3.31

TYPE: INTERPRETATION-NHTSA

DATE: June 9, 1994

FROM: John Womack -- Acting Chief Counsel, NHTSA

TO: Donald P. Green

TITLE: None

ATTACHMT: Attached To Letter Dated 2/14/94 From Donald Green To U.S. Department Of Transportation (OCC-9679)

TEXT: Dear Mr. Green:

This responds to your letter to this agency asking whether there is a State or Federal regulation prohibiting the use of passenger radial tires on recreational "pull type" trailers. I regret the delay in responding.

You explain that you were told by various tire dealers that radial tires should not be used on trailers because the soft sidewalls of radial tires could cause an uncontrollable swaying that could result in a serious accident. You then state that while t owing a trailer mounted with four radial tires, you were caught in a crosswind which caused the trailer to jackknife, resulting in a serious accident.

To begin, I am sorry to hear about your accident but am thankful that no one was hurt. The tire safety standards and regulations issued by the National Highway Traffic Safety Administration (NHTSA) require tires to be able to safely carry the load on a vehicle and to be labeled with important safety information, such as tire size, construction, and inflation pressure. There is nothing in our standards or regulations that prohibits the use of passenger car radial tires on trailers. In fact, Federal Mo tor Vehicle Safety Standard No. 120, "Tire selection and rims for motor vehicles other than passenger cars," expressly permits the use of passenger car tires on vehicles like trailers, provided that adjustment is made to the tire's load-carrying capacity .

NHTSA also issues consumer advisories to alert consumers to certain practices that should be avoided, such as mixing radial and non-radial tires. However, we have never issued a consumer advisory on the use of passenger car radial tires on trailers, and we are not aware of any widespread hazard due to the use of such tires on trailers.

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Your State could have requirements for the use of tires on trailers. We suggest that you check with the California Highway Patrol for information on that issue.

We regret we are unable to be more helpful. Should you have any further questions, please feel free to contact Walter Myers of my staff at this address or at (202) 366-2992.

Sincerely,