The 1989 GMC Trucks R2500 Suburban sits in the square-body heavy-duty truck era, when full-size utility vehicles were expected to haul, tow, and cover real road miles with a long-wheelbase, three-quarter-ton chassis underneath. On this Suburban, the primary fitment is a 235/85R16 radial on a 16-inch rim, giving tire choice a more modern metric-truck focus than many earlier collector vehicles. That keeps the decision centered less on decoding multiple vintage sizes and more on selecting the right radial within the correct fitment, sidewall look, and use case. For a stock-style restoration, regular road use, or a working classic, wheel specs and overall condition still deserve a careful check before replacing tires.
Which Tire Size Is Right for The 1989 GMC Trucks R2500 Suburban
The 1989 GMC Trucks R2500 Suburban uses one primary tire size: 235/85R16, a radial tire for a 16-inch rim. That same fitment carries across the covered sub-models, so the main decision is not which size fits, but which tire style and specification best suits a stock-style truck, a restoration-minded build, or regular road use.
In 235/85R16, 235 is the nominal section width in millimeters, 85 is the aspect ratio, R identifies radial construction, and 16 is the wheel diameter in inches. For the 1989 GMC Trucks R2500 Suburban, this is a heavy-duty truck radial fitment that matches the vehicle's three-quarter-ton character and 16-inch wheel setup. Available choices in this size include a BFGoodrich All-Terrain T/A KO2 with raised white letters, giving the truck a more assertive period-truck look than a plain sidewall. It is the size to evaluate when retaining the original wheel diameter and confirming rim width, clearance, and intended use.
Tire fitment is straightforward across the covered 1989 GMC Trucks R2500 Suburban sub-models. Both the Base and Sierra Classic use the same 235/85R16 radial size, so sub-model identification matters more for vehicle trim than for changing tire size.
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1989 GMC Trucks R2500 Suburban Base
The 1989 GMC Trucks R2500 Suburban Base uses the same 235/85R16 radial fitment as the other covered sub-model. Tire selection can stay focused on choosing the right 16-inch radial for the truck's appearance, rim-width compatibility, and intended road or utility use.
The 1989 GMC Trucks R2500 Suburban Sierra Classic also uses 235/85R16 radial tires. That keeps replacement straightforward, with the real decision centered on tire style, wheel compatibility, and whether the truck is being kept stock in appearance or driven more regularly.
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 1989 GMC Trucks R2500 Suburban Tires for Sale
Available 235/85R16 options for the 1989 GMC Trucks R2500 Suburban focus on radial truck construction, with BFGoodrich All-Terrain T/A KO2 styling and raised white letter sidewalls. Rim-width compatibility and load specification are key comparison points when reviewing the product grid.
Owners usually want to confirm the exact 235/85R16 fitment first, then sort through wheel compatibility, radial tire selection, sidewall appearance, and the maintenance checks that matter before putting a heavy-duty Suburban back on the road.
Tire Size & Fitment
What tire size fits a 1989 GMC Trucks R2500 Suburban?
The 1989 GMC Trucks R2500 Suburban uses a 235/85R16 radial tire. This is the primary fitment for the covered vehicle and it appears across both the Base and Sierra Classic sub-models, so there is no size split within those configurations.
That makes the buying decision more about choosing the right tire within 235/85R16 than sorting through multiple factory sizes. It is still smart to confirm that the truck retains its 16-inch wheels and that wheel width, load needs, and clearance all line up with the tire being considered, especially if the Suburban has seen wheel or suspension changes over time.
What size rim does a 1989 GMC Trucks R2500 Suburban use?
The primary tire fitment for the 1989 GMC Trucks R2500 Suburban is built around a 16-inch rim. The 235/85R16 size itself confirms that wheel diameter, and available products in this fitment are matched to that 16-inch setup.
Wheel diameter is only part of the fitment picture, so checking wheel width matters too before mounting replacement tires. A truck that still has its original-style wheel arrangement is easier to match, while aftermarket wheels, later swaps, or altered offsets can change how a 235/85R16 sits in the wheel opening and how much clearance it has in use.
Do all 1989 GMC Trucks R2500 Suburban sub-models use the same tire size?
Yes. The covered 1989 GMC Trucks R2500 Suburban sub-models use the same 235/85R16 radial tire size. That includes the Base and Sierra Classic, so tire replacement does not change from one of those trim designations to the other.
Even with shared sub-model fitment, it is worth confirming the actual wheels on the truck before ordering tires. Older Suburbans are often kept in service for decades, and replacement wheels or suspension work can change the practical fitment requirements even when the original tire size remains the correct reference point.
Choosing the Right Tire
What should I consider when choosing a 235/85R16 tire for a 1989 GMC Trucks R2500 Suburban?
Start with the correct 235/85R16 size, radial construction, and 16-inch wheel diameter used by the 1989 GMC Trucks R2500 Suburban. From there, compare tire character, sidewall appearance, rim-width compatibility, and load specification so the replacement matches how the truck is driven and how it is presented.
A Suburban kept for highway use, occasional utility work, or a restoration-minded look may call for slightly different priorities even within the same size. Wheel condition, actual wheel width, and the truck's current stance should all be checked before settling on a tire, since the right choice is about more than simply matching the sidewall code.
What sidewall styles are available for 1989 GMC Trucks R2500 Suburban tires?
Available 235/85R16 options for the 1989 GMC Trucks R2500 Suburban include raised white letter sidewalls. On the current fitment, that appearance comes on a BFGoodrich All-Terrain T/A KO2, giving the truck a distinctly traditional light-truck presentation rather than a plain black sidewall look.
Sidewall style affects appearance far more than fitment, but it can strongly shape the personality of a square-body Suburban. A raised white letter treatment suits many period-style truck builds, while buyers who want a more restrained look should pay close attention to the sidewall description on each tire before making a final selection.
What brands offer tires for the 1989 GMC Trucks R2500 Suburban?
BFGoodrich offers a tire in the correct 235/85R16 fitment for the 1989 GMC Trucks R2500 Suburban. The available product is from the All-Terrain T/A KO2 line, which places the emphasis on a truck-oriented radial rather than a purely cosmetic collector-car tire choice.
Brand alone should not be the only filter. It still helps to compare the full specification set, including wheel compatibility, sidewall treatment, and load rating, to make sure the tire suits the Suburban's weight class and intended use. On an older heavy-duty truck, those practical details matter at least as much as the name on the sidewall.
Restoration & Appearance
Which tire should I choose for a period-style 1989 GMC Trucks R2500 Suburban?
A period-style approach starts with the correct 235/85R16 radial size on the proper 16-inch wheel. In the available fitment, a BFGoodrich All-Terrain T/A KO2 keeps the truck in a size that suits its heavy-duty Suburban character while also presenting a distinctly vintage light-truck attitude.
The right choice depends on what kind of restoration look is the goal. Some owners want a work-truck feel, while others want a cleaner showroom-style presentation, so sidewall appearance matters almost as much as the size itself. When exact historical detail matters, marque-specific references and original vehicle documentation are worth checking before finalizing the tire style.
How does tire construction affect the appearance of a restored 1989 GMC Trucks R2500 Suburban?
On a 1989 GMC Trucks R2500 Suburban, the primary fitment is already a radial, so staying with radial construction preserves the truck's intended late-1980s tire character better than trying to force an earlier-looking bias-ply theme. The visual difference comes more from tread style and sidewall treatment than from a bias-ply-versus-radial decision here.
That means restoration-minded buyers should focus on the details that are visible at a glance: the 235/85R16 size, the overall tire stance on the wheel, and whether raised white letters suit the build. A square-body Suburban can look noticeably different depending on sidewall presentation, even when the underlying size and construction remain correct.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1989 GMC Trucks R2500 Suburban?
Yes. Even though the 1989 GMC Trucks R2500 Suburban uses a 235/85R16 radial as its primary fitment, wheel swaps, suspension changes, ride-height changes, and offset differences can all affect how that size fits in practice. The original size remains the reference point, but the truck's current setup still matters.
A Suburban with aftermarket wheels may have different wheel width or backspacing than a stock truck, which can alter clearance at the fender, steering components, or suspension. Before mounting new tires, measure the actual wheels on the vehicle and inspect available room through full steering travel and normal suspension movement.
What should I inspect before driving a 1989 GMC Trucks R2500 Suburban on new tires?
Check the wheels for damage or corrosion, verify that the wheel diameter and width suit the 235/85R16 tire, and inspect the suspension and steering for worn components. Tire pressure should be set appropriately, and the truck should also be checked for rubbing points that may not have been obvious with the old tires installed.
An older three-quarter-ton Suburban can hide issues that only show up once fresh tires are mounted and driven. A short test drive followed by another inspection is a smart habit, especially to catch uneven contact, air loss, or clearance problems early. That extra step helps protect both the tires and the vehicle's overall road manners.
How should 235/85R16 tires on a collector 1989 GMC Trucks R2500 Suburban be maintained?
Maintain 235/85R16 tires on a collector 1989 GMC Trucks R2500 Suburban by keeping them properly inflated, inspecting for cracking, bulges, cuts, and uneven wear, and watching for slow air loss during storage. Because older collector trucks may sit for long periods, visual checks matter just as much as tread depth.
Storage conditions have a real effect on tire life, especially when the truck is not driven often. Keeping the Suburban away from prolonged sunlight, moisture, and ozone sources helps preserve the rubber, and occasional movement can help avoid long-term flat spotting. Any tire showing age-related deterioration deserves closer evaluation before regular road use.
