Interpretation ID: 77-4.42

TYPE: INTERPRETATION-NHTSA

DATE: 11/30/77

FROM: AUTHOR UNAVAILABLE; J. J. Levin, Jr.; NHTSA

TO: Akin, Gump, Hauer & Feld

TITLE: FMVSS INTERPRETATION

TEXT: This responds to your September 26, 1977, letter asking several questions about the applicability of Standard No. 120, Tire Selection and Rims for Motor Vehicles Other Than Passenger Cars, to rims modified subsequent to their initial marking by the rim manufacturer.

Standard No. 120, as it applies to rim manufacturers, requires only that the manufacturer mark the rim with the information outlined in section S5.2 of the standard. The standard does not contain substantive performance requirements for tire rims that would necessitate extensive testing to comply with the requirements.

In cases where your client modifies previously marked rims, he might have some responsibilities for compliance with the standard. For those rims where the center disc is only added or altered by your client, there would be no requirement for him to provide his own markings on the tire rim. The rim manufacturer's markings would still contain the accurate size information.

For rims that your client modifies by the insertion of a steel plate increasing the dimensions of the rim, he becomes the rim manufacturer. As a rim manufacturer, it is his responsibility to mark the rim with the information listed and in the manner prescribed in S5.2 of the standard. This information includes the DOT symbol which indicates that he has complied with the requirements of Standard No. 120. Since the rim would have been marked initially with a different size, the National Highway Traffic Safety Administration (NHTSA) would require that the first markings be removed from the rim to avoid the possibility of confusion to persons who might read the incorrect size listing. This could result in the mismatching of a tire to the modified rim.

In a conversation between Ms. Maryanne Kane of your office and Mr. Roger Tilton of my staff, it was asked whether the NHTSA Standard No. 120 requirements would be applicable to rims manufactured entirely for off-road use. The NHTSA regulates only motor vehicles and motor vehicle equipment. By definition a motor vehicle is a vehicle used on the roads. Accordingly, vehicles designed for off-road use do not fall within the ambit of our regulations. The same is true for equipment designed for use on those off-road vehicles. The determination of whether a vehicle is an off-road vehicle depends upon its use. I have enclosed an interpretive letter that describes the criteria for determining what vehicles are motor vehicles under the National Traffic and Motor Vehicle Safety Act (Pub. L. 89-563) (the Act).

You should note further that my time your client undertakes an alteration of a rim, he is performing a manufacturing function that places him within the scope of the Act. Therefore, he would be responsible for any safety-related defects resulting from his manufacturing processes.

SINCERELY,

AKIN, GUMP, HAUER & FELD

September 26, 1977

Roger Tilton Office of Chief Counsel National Highway Traffic Administration

Re: Request for Interpretation

In accord with our recent conversation this letter will set forth our request for an interpretation of the application of 49 C.F.R. 571.120, Standard No. 120 (tire selection and rims for motor vehicles other than passenger cars) to certain processes used by our client, Southwest Wheel Manufacturing Company, whereby the rims and wheels of other manufacturers are altered or modified by Southwest Wheel to conform to certain customer requirements. I have enclosed a rough diagram of these changes to accompany the written explanation of each special application used by Southwest Wheel.

Special Application No. 1 (Diagram Nos. 1, 3 and 4) Diagram Nos. 1, 3 and 4 show a Goodyear rim in four different widths and three different diameters. Depending upon the application, Southwest Wheel adds the center disc to these Goodyear rims. The disc can be installed either as a formed disc manufactured by another company or a flat plate centered disc manufactured by Southwest Wheel. The disc can be located anywhere in the flat portion of the rim base. Placement of the center disc is determined by customer specifications for clearance or tracking or towing vehicles.

Special Application No. 2 (Diagram No. 2) Diagram No. 2 shows a process of splitting the rim and adding two inches to obtain additional width in the rim. This process is normally used for light vehicles, either pick-up trucks or trailers. As shown, the rims are split and Southwest Wheel adds additional rolled material to make the rim wider in order to accomodate special floatation tires used primarily in sand or in swamps. Although these are designed for off-road use, they are used on the highway in going to and from job sites. This process can also be combined with the Special Application No. 1 above, whereby the disc is added to the rims as shown in diagram numbers 1, 3 and 4.

Special Application No. 3 (Diagram No. 6) As seen from Diagram No. 6, Southwest Wheel may, on special order, cut the center disc from the rim base on lathes, move the center discs either in or out on the rim base to increase or decrease the wheel offset and then reweld to complete the process. Again, this is a special order process and done to customer specifications.

Special Application No. 4 (Diagram No. 5) Southwest Wheel purchases rims of the type shown in Diagram No. 5 from other manufacturers, and then installs the center disc to customer's hub application. Even though a wheel may be manufactured by one of the major wheel manufacturers, they do not make a wheel in either the diameter, the width, or both, that the trailer manufacturer wants to use on his equipment. Southwest Wheel then assembles the rim and the disc to its customer specifications.

Special Application No. 5 (Diagram No. 5, Pictures Nos. 10, 11, 12) Southwest Wheel manufacturers special wide-based wheels from rims shown on Diagram No. 5, such as taking two rims size 15 x 10 LBH, splitting them as shown in Picture No. 10, taking two wide sides, and welding them back together both inside and outside as shown in Picture No. 11. After this process, the center disc is then installed as illustrated in Picture No. 12. Thus, Southwest Wheel started out with two rims 10 inches wide and has coverted this product into one rim 13.75 inches wide with the center disc installed, changing the original 15 x 10 LBH rims to a wheel 15 x 13.75 LBH 8-holes 6 1/2 bolt circle.

I would be pleased to meet with you and discuss further any of the above processes and I would, of course, obtain any additional information you might require. Your earliest consideration is appreciated.

Jay D. Zeiler