The 2008 GMC Trucks Sierra 2500 HD belongs to a period when heavy-duty pickups had to balance work capability with everyday drivability, and GMC’s HD line was built with that dual purpose in mind. Whether used as a jobsite truck, tow rig, or well-kept daily driver, tire fitment matters because this Sierra 2500 HD uses two different radial sizes: 245/75R16 and 265/70R17. That means the first step is confirming which wheel package is actually on the truck. Available choices stay focused and practical, centered on BFGoodrich All-Terrain T/A KO2 tires with raised white letter sidewalls. For an HD truck like this, correct size, wheel match, and load capacity deserve as much attention as tread style.
Which Tire Size Is Right for The 2008 GMC Trucks Sierra 2500 HD
The 2008 GMC Trucks Sierra 2500 HD uses two primary tire sizes, and the right one depends on the truck’s exact sub-model and wheel diameter. Both fitments are radial, but they do not share the same rim size, so confirming whether the truck has 16-inch or 17-inch wheels is the first step before comparing load capacity, wheel-width compatibility, or product details.
245/75R16 is a metric radial size where 245 identifies the section width in millimeters, 75 is the aspect ratio, R denotes radial construction, and 16 is the wheel diameter in inches. On the 2008 GMC Trucks Sierra 2500 HD, this size serves as one of the primary heavy-duty fitments and is used on several SLE and WT configurations. The available option in this size is a BFGoodrich All-Terrain T/A KO2 with raised white letter sidewalls and a 6.5- to 8.0-inch rim-width range. This size is worth choosing when the truck is equipped with 16-inch wheels and the owner wants an all-terrain radial built around HD pickup use.
265/70R17 is a metric radial size with a 265-millimeter nominal section width, a 70-series profile, radial construction, and a 17-inch wheel fitment. For the 2008 GMC Trucks Sierra 2500 HD, this is the larger of the two primary sizes and appears on several SLE and SLT configurations. Product choice in this size remains within the BFGoodrich All-Terrain T/A KO2 line with raised white letter sidewalls, but there are meaningful differences in load capacity and specification. This size should be evaluated when the truck already carries 17-inch wheels and the intended use calls for careful attention to wheel width and tire rating.
Sub-model fitment for the 2008 GMC Trucks Sierra 2500 HD is not completely uniform, because some configurations use only one tire size while others can use either 245/75R16 or 265/70R17. Checking the exact cab and trim setup matters before selecting a tire, especially since the two sizes use different wheel diameters.
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2008 GMC Trucks Sierra 2500 HD SLE Crew Cab
The 2008 GMC Trucks Sierra 2500 HD SLE Crew Cab uses either 245/75R16 or 265/70R17 radial tires. That makes wheel confirmation especially important, since tire selection here starts with knowing whether the truck is on a 16-inch or 17-inch setup.
The 2008 GMC Trucks Sierra 2500 HD SLE Ext. Cab can be fitted with either 245/75R16 or 265/70R17 radial tires. Choosing the right tire means matching the existing wheel diameter first, then comparing the available all-terrain specifications within that size.
The 2008 GMC Trucks Sierra 2500 HD SLE Reg. Cab uses 245/75R16 radial tires. Since this configuration stays with one primary size, the decision shifts toward choosing the right product specification for 16-inch wheels rather than sorting between multiple fitments.
The 2008 GMC Trucks Sierra 2500 HD SLE w/Z71 Pkg. uses either 245/75R16 or 265/70R17 radial tires. Tire choice here depends on the actual wheel package on the truck, so a quick wheel and size check avoids ordering for the wrong rim diameter.
The 2008 GMC Trucks Sierra 2500 HD SLT Crew Cab can use 245/75R16 or 265/70R17 radial tires. Because both sizes appear on this sub-model, owners should verify the truck’s current wheel diameter and then compare load capacity and rim-width compatibility within the correct size.
The 2008 GMC Trucks Sierra 2500 HD SLT Ext. Cab uses 265/70R17 radial tires. With one primary fitment in place, the key comparison becomes product specification within that 17-inch size, including the tire’s rating and wheel-width range.
The 2008 GMC Trucks Sierra 2500 HD SLT w/Z71 Pkg. uses either 245/75R16 or 265/70R17 radial tires. The practical decision starts with confirming the wheel diameter on the truck, then selecting the all-terrain tire that matches that wheel and the truck’s intended workload.
The 2008 GMC Trucks Sierra 2500 HD WT Crew Cab uses 245/75R16 radial tires. That keeps fitment straightforward, so most buyers can focus on confirming 16-inch wheel compatibility and choosing the right heavy-duty all-terrain specification in that size.
The 2008 GMC Trucks Sierra 2500 HD WT Ext. Cab uses 245/75R16 radial tires. With only one primary size involved, selection is less about fitment variation and more about matching the 16-inch wheel setup to the tire’s intended load and use.
The 2008 GMC Trucks Sierra 2500 HD WT Reg. Cab uses 245/75R16 radial tires. For this sub-model, the main priority is confirming the wheel is within the proper width range and that the tire specification suits how the truck is actually driven or worked.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 2008 GMC Trucks Sierra 2500 HD Tires for Sale
Available choices for the 2008 GMC Trucks Sierra 2500 HD focus on BFGoodrich All-Terrain T/A KO2 radials in 245/75R16 and 265/70R17. The product grid is most useful for comparing raised white letter sidewalls, wheel-width compatibility, and the different load specifications offered within the 17-inch size.
Owners of a 2008 GMC Trucks Sierra 2500 HD usually need to sort out size, wheel diameter, and sub-model fitment first. The questions below also cover product selection, sidewall style, maintenance, and the checks that matter before putting an HD truck back on the road.
Tire Size & Fitment
What tire size fits a 2008 GMC Trucks Sierra 2500 HD?
The 2008 GMC Trucks Sierra 2500 HD uses two primary tire sizes: 245/75R16 and 265/70R17. Both are radial sizes, but they do not apply universally across every configuration, since some sub-models use one size only while others can be equipped with either depending on wheel setup.
The practical starting point is checking the truck’s actual wheel diameter and exact sub-model before choosing a tire. A 16-inch wheel requires the 245/75R16 fitment, while a 17-inch wheel requires the 265/70R17 size, and that distinction matters before comparing load rating, rim-width range, or intended use.
What size rim does a 2008 GMC Trucks Sierra 2500 HD use?
A 2008 GMC Trucks Sierra 2500 HD uses either a 16-inch or 17-inch rim, depending on the tire size fitted to the truck. The 245/75R16 tire fits a 16-inch wheel, while the 265/70R17 tire fits a 17-inch wheel.
Rim diameter should be confirmed before anything else because these two tire sizes are tied to different wheel sizes and are not interchangeable by diameter alone. It also helps to verify wheel width, especially on a truck that may have had aftermarket wheels installed or has changed from its original wheel package over time.
Do all 2008 GMC Trucks Sierra 2500 HD sub-models use the same tire size?
No. Some 2008 GMC Trucks Sierra 2500 HD sub-models use only 245/75R16, some use only 265/70R17, and several SLE, SLT, and Z71-related configurations can appear with either size. WT models are centered on 245/75R16, while the SLT Ext. Cab uses 265/70R17.
That variation means the sub-model name alone is not always enough if the truck has changed hands or has had wheel swaps. Checking the current tire sidewall and wheel diameter is the fastest way to confirm fitment before comparing product specifications, especially on trucks used for towing, hauling, or mixed pavement and off-pavement driving.
Choosing the Right Tire
What should I consider when choosing a tire for a 2008 GMC Trucks Sierra 2500 HD?
Start with the correct primary size for the truck: 245/75R16 or 265/70R17. From there, focus on radial construction, the intended use of the Sierra 2500 HD, the wheel-width range for the tire, and the load capacity attached to that specific product and inflation pressure.
A truck used mainly for highway driving may need a different emphasis than one used for towing, hauling, or rougher surfaces, even within the same size. It also helps to confirm whether the truck still has its original wheel package, because wheel changes can affect which of the two primary sizes should be considered.
What sidewall styles are available for 2008 GMC Trucks Sierra 2500 HD tires?
The available tires for the 2008 GMC Trucks Sierra 2500 HD use an RWL sidewall, which means raised white letters. That sidewall treatment appears on the BFGoodrich All-Terrain T/A KO2 options offered in both 245/75R16 and 265/70R17.
Sidewall style affects appearance as much as fitment, especially on a truck that is kept clean, restored, or used as a weekend vehicle. Buyers who want the tire presentation to match the truck’s overall look should consider whether the more traditional raised white letter appearance suits the way the Sierra 2500 HD is actually driven and shown.
How do I choose between the available 265/70R17 tires for a 2008 GMC Trucks Sierra 2500 HD?
The 265/70R17 choices for the 2008 GMC Trucks Sierra 2500 HD stay within the BFGoodrich All-Terrain T/A KO2 line, but they differ in specification. The two available versions carry different load capacities and weights, even though both use the same 17-inch rim diameter, radial construction, and raised white letter sidewall style.
That makes the decision less about tread style and more about matching the tire rating to the truck’s real workload. Owners should compare the tire’s load figure at its stated inflation pressure and confirm the wheel falls within the 7.0- to 9.0-inch rim-width range before deciding which 265/70R17 version belongs on the truck.
Restoration & Appearance
Which tire should I choose for a period-style 2008 GMC Trucks Sierra 2500 HD?
A period-style choice for a 2008 GMC Trucks Sierra 2500 HD starts with staying in the truck’s correct primary size, either 245/75R16 or 265/70R17 depending on the wheel package. Since the available options are radial BFGoodrich All-Terrain T/A KO2 tires, the look stays consistent with a practical heavy-duty pickup presentation from the era.
Appearance should still follow fitment, not the other way around. Matching the tire to the truck’s actual wheel diameter and overall stance helps preserve the right visual balance, and owners seeking strict restoration accuracy may also want to compare surviving original photos, sales literature, or marque-specific references before finalizing details.
How does tire construction affect the appearance of a restored 2008 GMC Trucks Sierra 2500 HD?
On a restored 2008 GMC Trucks Sierra 2500 HD, radial construction does not work against the truck’s period look because radial tires are the primary fitment here. The visual character is influenced more by staying with the proper size and choosing a sidewall style that suits the truck’s trim level and intended presentation.
Raised white letter sidewalls create a more assertive all-terrain look than a plainer black sidewall would, so the appearance decision is mostly about style rather than bias-ply versus radial. A restoration-minded owner should also pay attention to wheel size and stance, because an otherwise correct-looking tire can still look out of place on the wrong wheel package.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2008 GMC Trucks Sierra 2500 HD?
Yes. A 2008 GMC Trucks Sierra 2500 HD can be affected by aftermarket wheels, suspension changes, leveling kits, lifts, or body alterations that change how a tire sits in the wheel opening. Even when the truck uses one of its primary sizes, those changes can alter wheel-width suitability, steering clearance, or overall fitment margins.
That is why the current setup should be checked rather than assuming the truck still matches its original configuration. Measuring wheel diameter and width, checking current tire markings, and inspecting clearance at full steering lock can prevent problems before replacing tires on a truck that may have been modified for work or off-road use.
What should I inspect before driving a 2008 GMC Trucks Sierra 2500 HD on new tires?
Before driving a 2008 GMC Trucks Sierra 2500 HD on new tires, inspect wheel condition, valve stems, lug hardware, and inflation pressure, then confirm the tire size matches the truck’s actual wheel diameter. It is also wise to look over the suspension and steering components so the new tires are not being asked to work around worn or loose parts.
A short road test should include checking for rubbing, vibration, pull, or unusual clearance issues during turns and over bumps. On a heavy-duty truck, it also makes sense to revisit the load requirement and make sure the selected tire specification matches the way the Sierra 2500 HD is used for towing, hauling, or daily driving.
How should tires on a 2008 GMC Trucks Sierra 2500 HD be maintained?
Tires on a 2008 GMC Trucks Sierra 2500 HD should be kept at the proper inflation pressure for the specific tire and the truck’s actual use, then checked regularly for uneven wear, sidewall damage, punctures, and slow air loss. Rotation and routine inspection matter, especially on a heavy-duty pickup that may carry varying loads through the year.
Stored or lightly used trucks deserve the same attention as daily drivers because age, sunlight, and long periods of sitting can still affect tire condition. It helps to inspect tread and sidewalls before longer trips, and any sign of cracking, bulging, or persistent pressure loss should be addressed before putting the truck back into regular road service.
