49 C.F.R. 49 CFR--PART 571
Title 49 - Transportation
Effective Date(s): June 1, 2007 3. Section 571.110 is amended by revising S2, S4.1, S4.2.1, S4.2.2, S4.4.1(a), and table 1 following S4.4.1(b), by adding S4.2.1.1, S4.2.1.2, S4.2.2.1, S4.2.2.2, S4.2.2.3, and S4.4.2 and by adding to S3 in alphabetical order, definitions for “Rim diameter,” “Rim size designation,” “Rim type designation,” “Rim width,” and “Weather side,” to read as follows: * * * * * S2. Application. This standard applies to motor vehicles with a gross vehicle weight rating (GVWR or 4,536 kilograms (10,000 pounds) or less, except for motorcycles, and to non-pneumatic spare tire assemblies for those vehicles. S3. Definitions * * * * * Rim diameter means nominal diameter of the bead seat. Rim size designation means rim diameter and width. Rim type designation means the industry of manufacturer's designation for a rim by style or code. Rim width means nominal distance between rim flanges. * * * * * Weather side means the surface area of the rim not covered by the inflated tire. * * * * * S4.1. General. Vehicles shall be equipped with tires that meet the requirements of §571.139, New pneumatic tires for light vehicles, except that passenger cars may be equipped with a non-pneumatic spare tire assembly that meets the requirements of §571.129, New non-pneumatic tires for passenger cars and S6 and S8 of this standard. Passenger cars equipped with such an assembly shall meet the requirements of S4.3(e), and S5, and S7 of this standard. * * * * * S4.2.1 Tire load limits for passenger cars. S4.2.1.1 The vehicle maximum load on the tire shall not be greater than the applicable maximum load rating as marked on the sidewall of the tire. S4.2.1.2 The vehicle normal load on the tire shall not be greater than 94 percent of the load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire. S4.2.2 Tire load limits for multipurpose passenger vehicles, trucks, buses, and trailers. S4.2.2.1 Except as provided in S4.2.2.2, the sum of the maximum load ratings of the tires fitted to an axle shall not be less than the GAWR of the axle system as specified on the vehicle's certification label required by 49 CFR part 567. If the certification label shows more than one GAWR for the axle system, the sum shall be not less than the GAWR corresponding to the size designation of the tires fitted to the axle. S4.2.2.2 When passenger car (P-metric) tires are installed on an MPV, truck, bus, or trailer, each tire's load rating is reduced by dividing it by 1.10 before determining, under S4.2.2.1, the sum of the maximum load ratings of the tires fitted to an axle. S4.2.2.3 (a) For vehicles equipped with P-metric tires, the vehicle normal load on the tire shall be no greater than the value of 94 percent of the derated load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire. (b) For vehicles equipped with LT tires, the vehicle normal load on the tire shall be no greater than 94 percent of the load rating at the vehicle manufacturer's recommended cold inflation pressure for that tire. * * * * * S4.4.1 * * * (a) Be constructed to the dimensions of a rim that is listed by the manufacturer of the tires as suitable for use with those tires, in accordance with S4 of §571.139. (b) * * * S4.4.2. Rim markings for vehicles other than passenger cars. Each rim or, at the option of the manufacturer in the case of a single-piece wheel, each wheel disc shall be marked with the information listed in paragraphs (a) through (e) of this S4.4.2, in lettering not less than 3 millimeters in height, impressed to a depth or, at the option of the manufacturer, embossed to a height of not less than 0.125 millimeters. The information listed in paragraphs (a) through (c) of this S4.2.2 shall appear on the outward side. In the case of rims of multi piece construction, the information listed in paragraphs (a) through (e) of this S4.2.2 shall appear on the rim base and the information listed in paragraphs (b) and (d) of this S4.2.2 shall also appear on each other part of the rim. (a) A designation that indicates the source of the rim's published nominal dimensions, as follows: (1) “T” indicates The Tire and Rim Association. (2) “E” indicates The European Tyre and Rim Technical Organization. (3) “J” indicates Japan Automobile Tire Manufacturers” Association, Inc. (4) “L” indicates ABPA (Brazil), a.k.a. Associacao Latino Americana De Pneus E Aros. (5) “F” indicates Tire and Rim Engineering Data Committee of South Africa (Tredco). (6) “S” indicates Scandinavian Tire and Rim Organization (STRO). (7) “A” indicates The Tyre and Rim Association of Australia. (8) “I” indicates Indian Tyre Technical Advisory Committee (ITTAC). (9) “R” indicates Argentine Institute of Rationalization of Materials, a.k.a. Instituto Argentino de Racionalizacio
(10) “N” indicates an independent listing pursuant to S4.1 of §571.139 or S5.1(a) of §571.119. (b) The rim size designation, and in case of multipiece rims, the rim type designation. For example: 20 x 5.50, or 20 x 5.5. (c) The symbol DOT, constituting a certification by the manufacturer of the rim that the rim complies with all applicable Federal motor vehicle safety standards. (d) A designation that identifies the manufacturer of the rim by name, trademark, or symbol. (e) The month, day and year or the month and year of manufacture, expressed either numerically or by use of a symbol, at the option of the manufacturer. For example: “September 4, 2001” may be expressed numerically as: “90401”, “904, 01” or “01, 904”; “September 2001” may be expressed as: “901”, “9, 01” or “01, 9”. (1) Any manufacturer that elects to express the date of manufacture by means of a symbol shall notify NHTSA in writing of the full names and addresses of all manufacturers and brand name owners utilizing that symbol and the name and address of the trademark owner of that symbol, if any. The notification shall describe in narrative form and in detail how the month, day, and year or the month and year are depicted by the symbol. Such description shall include an actual size graphic depiction of the symbol, showing and/or explaining the interrelationship of the component parts of the symbol as they will appear on the rim or single piece wheel disc, including dimensional specifications, and where the symbol will be located on the rim or single piece wheel disc. The notification shall be received by NHTSA not less than 60 calendar days before the first use of the symbol. The notification shall be mailed to the Office of Vehicle Safety Compliance (NVS–222), National Highway Traffic Safety Administration, 400 Seventh Street SW., Washington, DC 20590. All information provided to NHTSA under this paragraph will be placed in the public docket. (2) Each manufacturer of wheels shall provide an explanation of its date of manufacture symbol to any person upon request. * * * * *
Amendment from June 26, 2003
49 CFR--PART 571
Amendment(s) published June 26, 2003, in 68 FR 38147
§ 571.110 Standard No. 110; Tire selection and rims for motor vehicles with a GVWR of 4,536 kilograms (10,000 pounds) or less.
Table I._Occupant Loading and Distribution for Vehicle Normal Load for Various Designated Seating Capacities---------------------------------------------------------------------------------------------------------------- Designated seating capacity, number of Vehicle normal load, number of Occupant distribution in a occupants occupants normally loaded vehicle----------------------------------------------------------------------------------------------------------------2 through 4............................. 2.................................... 2 in front.5 through 10............................ 3.................................... 2 in front, 1 in second seat.11 through 15........................... 5.................................... 2 in front, 1 in second seat, 1 in third seat, 1 in fourth seat.16 through 22........................... 7.................................... 2 in front, 2 in second seat, 2 in third seat, 1 in fourth seat.----------------------------------------------------------------------------------------------------------------
