Interpretation ID: 86-1.42

TYPE: INTERPRETATION-NHTSA

DATE: 02/21/86

FROM: AUTHOR UNAVAILABLE; Erika Z. Jones; NHTSA

TO: Mr. M. Hayashibara

TITLE: FMVSS INTERPRETATION

TEXT:

Mr. M. Hayashibara Managing Director Certification Business Division Mazda (North America), Inc. 24402 Sinacola Court Farmington Hills, MI 48018

Dear Mr. Hayashibara:

This responds to your letter seeking an interpretation of certain terms used in Standard No. 110, Tire selection and rims -passenger cars (49 CFR S571.110). Specifically. you asked about the definitions of the terms "curb weight", "accessory weight", and "production options weight". These terms are defined in Standard No. 110 as follows.

The "curb weight" of a vehicle is calculated by adding the weight of the vehicle with all of its standard equipment, including its maximum capacity of fuel, oil, and coolant to the weights of two optional items of equipment, if the vehicle is equipped with these optional items. The items whose weight is included in calculating the curb height, if present on the vehicle, are air conditioning and the additional weight of an optional engine. No other optional items are included in calculating a vehicle's curb weight, even if the vehicle is equipped with such options.

The "accessory weight" of a vehicle means the combined weight (in excess of the weight of the standard equipment items that may be replaced) of automatic transmission, power steering, power brakes, power windows, power seats, radio, and heater to the extent that these items are available as factory-installed options on that vehicle, regardless of whether these options are actually present on the vehicle in question. No other items of optional equipment are included in calculating the accessory weight, even if the vehicle is equipped with such options.

The "production options weight" means the combined weight of all items of optional equipment that meet all of the following criteria:

(1) The weight of the item of optional equipment is more than five pounds greater than the weight of the item of standard equipment that it replaces:

(2) The optional equipment is present on the vehicle in question: and

(3) The weight of the optional equipment has not previously been considered in either the curb weight or the accessory weight.

Section 53 of Standard No. 110 lists the following examples of items of optional equipment whose weight might be considered when calculating the production options weight: heavy duty brakes, ride levelers, roof rack, heavy duty battery, and special trim, However, any item of optional equipment that meets the three criteria listed above would be included in calculating the production options weight, even if that item were not listed in the examples. Therefore, Mazda's understanding is correct that the weight of four-wheel drive components, aerodynamic accessories, special body styling panels, and sunroofs ace included when calculating the production options weight.

If you have any further questions on this subject or need more information, please contact Steve Kratzke of my staff at this address or by telephone at (202) 426-2992.

Sincerely,

Original Signed By

Erika Z. Jones Chief Counsel

November 21, 1985

Ms. Erika Jones Chief Counsel National Highway Traffic Safety Administration 400 Seventh Street, S.W. Washington, D.C. 20590

RE: Request for Interpretation - Federal Motor Vehicle Safety Standard 110 - Tire Selection and Rims

Dear Ms. Jones,

Mazda requests clarification and verification of selected terms that appear in FMVSS 110. Tire Selection and Rims. These relate to the definition of the various weight classifications and the inclusion of the items that compose and differentiate them.

In FMVSS 110.3, the terms "accessory weight", "curb weight", "vehicle capacity weight" and "production options weight are defined and used to classify various vehicle configuration weights. These vehicle configuration weights, the "vehicle maximum load on the tire" and the "vehicle normal load on the tire" are then applied to the load capacities of the tire selected for that vehicle to insure adequate performance of the tire under foreseeable vehicle operating conditions. The principle areas of difference between the two are: specified cargo weight, luggage weight, difference in occupant weight dependent on the difference in the total number of designated seating positions and the number of seating positions cited in Table I, and production options weight.

Mazda's central area of interest in these definitions lies in the components that must be included in the "curb weight", "accessory weight" and the "production options weight". It is Mazda's understanding that the components listed in the definition of "curb weight" and "accessory weight" are limited to only those components actually specified,,such as standard equipment, heavier optional engines, automatic transmissions, power steering, power brakes, etc.; and no additional components. Conversely. the "production options weight" definition is understood to contain only a partial listing of the many different components, excluding only those specifically referenced in the "curb weight" and "accessory weight", that may be installed on a vehicle. Some examples of components not referenced that may, by means of Mazda's current understanding of the definitions, be included in the "production options weight" are: four wheel drive components, aerodynamic accessories, special body styling panels, and sunroofs.

Please review our understanding of these terms and verify that they are accurate. Also, please comment on any factors that have not been discussed that may influence the determinations of the Agency and the application by manufacturers of these definitions.

Thank you for your consideration of this matter.

Sincerely,

M. Hayashibara Managing Director Certification Business Division