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Old 05-14-2007, 02:33 PM   #1
Cat320
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Join Date: May 2006
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Posts: 1,696
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GM ReplacementTires

There have been several threads about upsizing oem tires. FWIW, here is a GM bulletin on that subject:

Subject:Info - Inspection of Tire and Wheel Size Prior to Diagnosis of Transmission Shifts, Poor Performance, Speedometer, Cruise Control Concerns #01-03-10-010F - (01/04/2007)


Models:2001-2007 Chevrolet Silverado Pickup (Classic) Models
2001-2007 GMC Sierra Pickup (Classic) Models
with Allison® Automatic Transmission


This bulletin is being revised to add the 2007 model year. Please discard Corporate Bulletin Number 01-03-10-010E (Section 03 -- Suspension).
Proper diagnosis of engine, transmission, speedometer and cruise control concerns must begin with an inspection of tire/wheel size.

• The 2500 series trucks have LT245/75R16E tires as standard equipment.
• The 3500 series trucks with dual rear wheels have LT215/85R16D tires as standard equipment.
• The 3500 series trucks with single rear wheels have LT265/75R16E tires as standard equipment.
A truck that has different tires and wheels will have engine power/performance concerns, transmission shift concerns, speedometer registered speed concerns, cruise control concerns and increased steering effort, especially during parking lot maneuvers at slow speeds.
Before any diagnosis is performed for these types of concerns, inspect the tires/wheels for the proper tire and wheel combinations.
If a truck is found to have other than the above listed tire sizes, no further diagnosis should be undertaken until the original size tires and wheels are reinstalled on the truck.
The Engine Control Unit (ECM) and Transmission Control Module (TCM) use (RPM) and (VSS) inputs as operational parameters for engine torque, transmission shifting, cruise control operation and speedometer indicated vehicle speed.
Calibrations for different tire/wheel combinations are not available.
Therefore, changing of tire and/or wheel size should not be undertaken by dealerships or truck owners.
[url="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1884523&psdid=1058&evc=sm#ss1-1884523]Warranty Information

Reinstalling the proper wheels and tires on the vehicle, prior to performing any type of diagnosis of the truck, would be considered truck owner responsibility and not a warranty repair.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.
Document ID# 1884523
 
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Old 05-14-2007, 04:37 PM   #2
Dave e Victoria
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Join Date: Nov 2003
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M.O.C. #635
all that said, I really would have liked slightly wider tires on Bubba but the dually configuration would have required a spacer between the rear wheels. The resulting tread would have exceeded the fender width. I didn't want the mess on the front of te trailer thrown up by the tires.

I changed out the 245's on our 2003 2500HD to 265's with excellent results. better ride and better wear. But, I did also change brands and fitted out Michelins.
I recently changed out the front tires on Bubba but retained the stock size. I opted for the Michelins. Rear tires have a good deal of wear left at 30,000 miles. Front ones were pretty much shot - unbalanced and uneven.
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