Interpretation ID: 77-2.8

TYPE: INTERPRETATION-NHTSA

DATE: 04/08/77

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: American Honda Motor Co., Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your February 23, 1977, request for an interpretation of paragraph S10.1 of Safety Standard No. 111, Rearview Mirrors, which specifies that motorcycle mirrors shall be adjustable "by tilting in both the horizontal and vertical directions." Your letter describes a newly designed motorcycle mirror used on Honda's and asks whether the mirror meets the adjustment requirement of paragraph S10.1 of the standard.

According to your description the mirror is adjusted horizontally by loosening a locknut, positioning the mounting bracket and retightening the locknut. Vertical adjustment is accomplished by rotating the mounting bracket of the mirror (the rotation is at an angle of 35 degrees to the vertical plane).

Standard No. 111 requires passenger car mirrors and motorcycle mirrors to be adjustable "by tilting". The agency interprets this adjustment requirement to mean that the mirror must be adjustable by the driver without the use of tools (for example, a mirror mounted on a universal ball joint). The adjustment requirement for mirrors on trucks, multipurpose passenger vehicles, and buses only specifies that those mirrors be "adjustable in both the horizontal and vertical directions"; there is no requirement that they be adjustable by "tilting". Therefore, mirror adjustment that requires the use of tools is permitted on trucks, multipurpose passenger vehicles, and buses. The basis for the different adjustment requirement is that trucks, multi-purpose passenger vehicles, and buses are generally driven for longer periods of time by the same driver, than passenger cars and motorcycles.

Since the motorcycle mirror you describe is not adjustable by tilting in both the horizontal and vertical directions without loosening and retightening the locknuts, it does not appear that the mirror would comply with the requirements of Standard No. 111.

Sincerely,

ATTACH.

AMERICAN HONDA MOTOR CO., INC.

February 23, 1977

Chief Council -- NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION

Dear Sir:

This is to request your official interpretation regarding the compliance of a new design for a motorcycle rear-view mirror with the requirements of section S10.1 of FMVSS 111 which becomes effective on February 26, 1977.

Section S10.1 states in part, "The mirror shall be adjustable by tilting in both the horizontal and vertical directions."

The mirror in question is presently used on our model XL100. I am enclosing a brochure which shows the mirror installed on the machine as well as an engineering drawing of the design.

As you will see, the mounting bracket is threaded into the brake or clutch lever mounting and projects outward at an angle of approximately 35 degrees from the horizontal. The mirror holder slips over the end of the bracket and two screws are tightened sufficiently to hold the mirror in place while still allowing it to be adjusted by rotating around the bracket.

The mirror is able to be adjusted horizontally by loosening the locknut, positioning the mounting bracket and retightening the locknut. Vertical adjustment is performed as described above although the mirror does not rotate exactly in the vertical plane but at an angle of approximately 35 degrees to the vertical.

Your earliest response in this matter will be greatly appreciated. If you have any questions or comments please contact me by telephone at (213) 327-8280 extension 372.

Yours truly,

Brian Gill -- Assistant Manager, Safety & Environmental Activities

Enclosure

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