The purpose of this bulletin is to provide additional information and guidance when changing out tire and wheel assemblies on any General Motors vehicle(s).
Given the marketplace and consumer demands to personalize vehicles with different tire and wheel assemblies, it is important to remind dealers of the vehicle implications and requirements that are the responsibility of your dealership.

For vehicles with a GVWR of 10,000 lbs. or less (passenger cars, light duty trucks and SUVs), FMVSS 110, Tire Selection and Rims, requires the "Tire Placard Label" shown below, to be affixed to each vehicle with the corresponding information specific to the vehicle's seating capacity, combined weight, and tire size (including the spare).

In addition to the tire placard label, each vehicle configuration contains a sophisticated electronic calibration (CAL) that integrates the ABS braking, wheel speed sensors, tire pressure monitoring system (TPMS), wheel size, and clearances, just to mention a few. It is important to note that changes in the tire and wheel assembly may affect the overall performance for which the vehicle was designed and tested. .

For any dealer modifications involving permanently installed vehicle equipment or any changes to the tires and wheels, the information on the "tire placard" must be examined to determine if any of the information has been changed by the alteration or other modifications. If so, then a new placard with updated information must be completed and installed so that it obscures the original placard.

Specific to the tire size and cold tire pressure information, the label must reflect the actual front, rear, and spare tire and wheel assemblies (if applicable) that are actually installed on the vehicle as it leaves the dealership.

Dealers are reminded that the National Traffic and Motor Vehicle Safety Act ("Safety Act") provides, in part, a dealer may not sell vehicles or equipment that do not comply with the applicable safety standards, and dealers are prohibited from making inoperative, in whole or in part, any part of a device or element of design installed on or in a motor vehicle in compliance with an applicable motor vehicle safety standard. Accordingly, a dealer must replace the vehicle placard if, after the dealer installs additional equipment, the information required is no longer accurate.

As a result, GM Accessory tire and wheel systems, as released, have an approved tire and wheel combination that has been designed and validated by GM Engineering for a specific vehicle application. Each release contains the appropriate installation instructions for TPMS, replacement tire placard insert, and where applicable, instructions for a new CAL to re-program the vehicle by calling the GM Techline at 1-800-828-6860 for a VCI number.

To verify if there are optional tire and wheel combinations that apply for the specific vehicle configuration, you can go online to GM Dealer World under the "Accessory Information Center" found on the homepage or contact Techline Customer Support at 1-800-828-6860. DO NOT use the information offered in the ABS module (tire size selection) as a guide to see what tires are applicable to the vehicle in question. Changing the tire size in the ABS module will only affect ABS wheel speed sensor calibrations that are direct inputs to the ABS module. It will not correct or calibrate the speedometer's accuracy or other sensor values.

If your customer or dealership wants to install non-GM products, dealers are reminded as provided in Article 5.1.1 of the GM Dealer Sales and Service Agreement ("Dealer Agreement"), if a dealer modifies or sells a modified new vehicle, or installs any equipment, accessory, recycled part or part not supplied by General Motors, the dealer must disclose this fact on the purchase order and bill of sale, indicating that the modification, equipment, accessory or part is not warranted by General Motors. The appropriate form "Dealer Disclosure of Non-GM Products Used" can be found in Section 3.3 of the GM Service Policies and Procedures and a convenient copy is provided as attached. With respect to vehicle repairs, Article 7.2 of the Dealer Agreement provides that dealers will only use genuine GM or GM approved Parts and Accessories in performing warranty
repairs, special policy repairs, and any other repairs paid for by General Motors. This also is addressed in the GM Service Policies and Procedures Manual. All of these existing procedures are in place to help ensure the safety and satisfaction of our customers.

Following these guidelines, the GM Service Policies and Procedures, and using approved GM Accessories and GM products for the vehicle, will help your dealership maintain the vehicle's compliance while meeting your customer's demand for personalization. If you have any questions, please contact your District Service Manager (DVM).

Team ZR-1
True Custom Performance Tuning