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Message: <blockquote data-quote="AuroraGirl" data-source="post: 28623" data-attributes="member: 9417"><p> <table style='width: 100%'><tr><th></th><th></th><th></th><th></th><th></th><th>Size Description</th><th></th><th></th><th></th><th></th><th></th><th></th></tr><tr><th>Drive Type</th><th>Body Style</th><th>Vehicle Option</th><th>GVWR (lbs)</th><th>Front/Rear/Both</th><th>Standard</th><th>Optional</th><th>Inflation (psi) Front-Rear</th><th>Torque (ft-lbs)</th><th>Wheel Base (in) Min - Max</th><th>Rim Size</th><th>Bolt (# - mm)</th></tr><tr><td>4WD</td><td>4D Utility</td><td></td><td>7400-7700</td><td>B</td><td>275/60R20 115S</td><td></td><td>35 - 35</td><td>140</td><td></td><td>9J</td><td>6-139.7mm<br /> <br /> <br /> </td></tr></table><p></p><p>couldnt find moire details sorry</p><p></p><p>gm will not endorse this setup at all because of the fact the  brakes are not in the design specs of stock. however, you CAN get gm to approve it for 20 inch wheels in one tire size only.</p><p></p><p>But if you want to know about a factory calibration to get it close, heres what you need:</p><table style='width: 100%'><tr><td><p style="text-align: left"><table style='width: 100%'><tr><td><strong>Subject:</strong></td><td><strong>20" Wheels Available Through GM Accessories</strong></td></tr></table><br /> <br /> <br /> <table style='width: 100%'><tr><td><strong>Models:</strong></td><td><strong>1999-2007 Chevrolet Silverado 1500 Series Only (Classic)</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>1999-2007 GMC Sierra 1500 Series Only (Classic)</strong></td></tr></table><table style='width: 100%'><tr><td></td><td> </td></tr></table><table style='width: 100%'><tr><td></td><td><strong>Excludes 1999-2000 Vehicles with 4.3L Engine (VIN W -- RPO L35)</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>Excludes Vehicles with Quadrasteer (RPO NYS)</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>Excludes Parallel Hybrid Truck (RPO HP2)</strong></td></tr></table><table style='width: 100%'><tr><td></td><td><strong>Excludes 2001-2004 Vehicles with Traction Control (RPO NW7) combined with 3.42 Axle Ratio (RPO GU6)</strong></td></tr></table><table style='width: 100%'><tr><td></td><td> </td></tr></table><table style='width: 100%'><tr><td></td><td><strong>Refer to the Model Application Chart in the beginning of this bulletin to verify usage.</strong></td></tr></table></p> <br /> <br /> <br /> <hr class="bbc-hr bbc-hr--3" /> <strong>This bulletin is being revised to include 2007 model year and calibration information. Please discard Corporate Bulletin Number 03-03-10-006E (Section 03 -- Suspension).</strong><br /> <br /> <hr class="bbc-hr bbc-hr--3" /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss1-1864476" target="_blank">[H3]Model Application Chart:[/H3]</a><br /> <br /> <table style='width: 100%'><tr><th><p style="text-align: center">Cab</p> </th><th><p style="text-align: center">Box</p> </th><th><p style="text-align: center">2WD*</p> </th><th><p style="text-align: center">4WD</p> </th></tr><tr><td><p style="text-align: center">Regular</p> </td><td><p style="text-align: center">Standard<br /> 1.8 m (6 ft)</p> </td><td><p style="text-align: center">Y</p> </td><td><p style="text-align: center">N/A</p> </td></tr><tr><td><p style="text-align: center">Regular</p> </td><td><p style="text-align: center">Long<br /> 2.4 m (8 ft)</p> </td><td><p style="text-align: center">Y</p> </td><td><p style="text-align: center">N/A</p> </td></tr><tr><td><p style="text-align: center">Extended</p> </td><td><p style="text-align: center">Standard<br /> 1.8 m (6 ft)</p> </td><td><p style="text-align: center">Y</p> </td><td><p style="text-align: center">Y</p> </td></tr><tr><td><p style="text-align: center">Extended</p> </td><td><p style="text-align: center">Long<br /> 2.4 m (8 ft)</p> </td><td><p style="text-align: center">Y</p> </td><td><p style="text-align: center">Y</p> </td></tr><tr><td><p style="text-align: center">Crew</p> </td><td><p style="text-align: center">Fleetside</p> </td><td><p style="text-align: center">Y **</p> </td><td><p style="text-align: center">Y **</p> </td></tr></table>Excludes 1999-2000 vehicles with 4.3L (VIN W -- RPO L35) engine.<br /> <br /> *Excludes vehicles with Traction Control combined with 3.42 Axle Ratio (RPO NW7).<br /> <br /> [H4]** Excludes 2WD Crew Cab built prior to:[/H4]<br /> <p style="text-align: left"><table style='width: 100%'><tr><td>   • </td><td>Sierra built prior to VIN breakpoint 51334993</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>Silverado built prior to VIN breakpoint 51334946</td></tr></table></p> [H4]** Excludes 4WD Crew Cab built prior to:[/H4]<br /> <p style="text-align: left"><table style='width: 100%'><tr><td>   • </td><td>Sierra built prior to VIN breakpoint 51334978</td></tr></table><table style='width: 100%'><tr><td>   • </td><td>Silverado built prior to VIN breakpoint 51335001</td></tr></table></p> [H4]** Excludes AWD Crew Cab built prior to:[/H4]<br /> -- Sierra Denali built prior to VIN breakpoint 51334762<br /> <br /> The purpose of this bulletin is to provide a reference guide for the technician to upgrade a vehicle from factory wheels and tires to 20" wheels and tires, which are available through GM Accessories (dealers must confirm availability of parts prior to utilizing this bulletin). This guide will cover Tire Specifications, the Spare Tire, Balancing, Center Cap Installation, Wheel Nuts, Re-Programming and Label requirements.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss2-1864476" target="_blank">[H3]Tires[/H3]</a><br /> <br /> GM has designed 20" wheels based on the Goodyear Eagle LS and LS2 P275/55R20 tire. The Goodyear Eagle LS tire has a Tire Performance Criteria spec #1235 and the LS2 has a Tire Performance Criteria spec #1245. These tires have been designed to GM's specific Tire Performance Criteria. GM's Tire Performance Criteria specifications meet or exceed all Federal safety guidelines.<br /> <br /> When mounting the tires, rubber lubricant, P/N 12345884 (in Canada, P/N 5728223), MUST be used. The vehicle should not be driven aggressively (hard acceleration or braking) for at least 6-8 hours after tire mounting to allow the lube to dry. Failure to do so may cause the tire to slip on the rim. This condition will affect wheel balance which could result in a vibration.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss3-1864476" target="_blank">[H3]Spare Tire[/H3]</a><br /> <br /> A P265/75R16 or P265/70R17 tire should be used as a spare. Re-use the vehicle's original spare wheel to mount the spare tire. The spare tire should be used to drive the vehicle to a tire repair/replacement facility and is not intended for extended driving conditions.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss4-1864476" target="_blank">[H3]Tire Changers[/H3]</a><br /> <br /> Dealers must have the correct level of tire changing equipment to perform tire changing services. GM requirements and recommendations for servicing glamour wheels are as follows:<br /> <br /> <p style="text-align: left"><table style='width: 100%'><tr><td>    • </td><td>Rim Clamp design</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>Runflat capable (preferred)</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>Side mounted bead breaking to reduce stress on the wheel and tire</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>No metal contact to the wheel at the clamping jaws</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>Protective devices to prevent damage during mounting and dismounting operations</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>Regulated air pressure to protect user and wheel assembly</td></tr></table><table style='width: 100%'><tr><td>    • </td><td>Approved lubricant (P/N 12345884 [in Canada, P/N 5728223]) to avoid wheel slip and damage to the wheel</td></tr></table></p> For further information regarding equipment meeting the requirements for this program, call 1-800-GM-TOOLS.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss5-1864476" target="_blank">[H3]Balancing[/H3]</a><br /> <br /> MC style coated weights are recommended and will provide the best balancing of the tire-wheel assembly. If stick-on weights are used, be sure to follow the manufacturers' recommended installation procedure (SI Document ID #664222) making sure the surface is clean and dry. Using the incorrect type of weights will result in improper fit, and such weights may fall off the wheel.<br /> <br /> Balancing of the tire and wheel assembly must be performed on a computerized balancer, capable of static and dynamic wheel balance modes. Assemblies should be balanced to within 1/4 ounce on either rim flange. Proper cones and adapters should be used, free of nicks and burrs to ensure proper balancing.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss6-1864476" target="_blank">[H3]Center Cap[/H3]</a><br /> <br /> Install the center cap onto the wheel after the tire has been mounted and balanced, but BEFORE the assembly is installed onto the vehicle. The preferred method for center cap installation is to push in by hand. As an alternate, use a nonmetallic object to push the center cap into place. Attempting to "hammer-on" the caps may result in damage to the cap.<br /> <br /> <a href="https://gm.saturn.team/Chevrolet/Chevy_K_Silverado___4WD/2004/bulletins/1864476#ss7-1864476" target="_blank">[H3]Wheel (Lug) Nuts[/H3]</a><br /> <br /> <img src="https://gm.saturn.team/images/1392191.gif" alt="Object Number: 1392191 Size: SH" class="fr-fic fr-dii fr-draggable " style="" /><br /> ALUMINUM WHEELS REQUIRE SPECIAL WHEEL NUTS. Each wheel nut should be torqued in the appropriate torque sequence (refer to graphic) and to 190 N·m (140 lb ft). The torque should be re-checked after the first 160 km (100 mi). To help protect the wheels from theft, a wheel lock kit is also available.<br /> <br /> <br /> </td></tr></table></blockquote><p></p>