The 1991 GMC Vans G3500 came from an era when full-size vans were expected to handle family travel, commercial duty, and long-wheelbase hauling with equal confidence. Whether dressed as a Rally passenger van or a Vandura work-oriented model, this platform depends on a straightforward heavy-duty tire fitment. For this year and model, the primary tire size is 225/75R16 in radial construction on a 16-inch rim. Available choices in that size lean toward truck-style radial design, including a raised white letter sidewall option in the BFGoodrich All-Terrain T/A KO2 series. The key decision is matching that 225/75R16 fitment to the van’s actual wheels, use, and present-day condition.
Which Tire Size Is Right for The 1991 GMC Vans G3500
The 1991 GMC Vans G3500 uses one primary tire size: 225/75R16. It is a radial fitment on a 16-inch rim, and that same size carries across the covered Rally and Vandura sub-models, including extended and heavy-duty-suspension versions. That means the real choice is not between different primary sizes, but between the available tire style, sidewall presentation, load-related specifications, and compatibility with the wheels currently on the van.
225/75R16 is a metric radial size in which 225 identifies the nominal section width in millimeters, 75 is the aspect ratio, R designates radial construction, and 16 is the rim diameter in inches. On the 1991 GMC Vans G3500, this is a modern radial fitment that suits the van’s heavy-duty full-size role and keeps sizing straightforward across the model range. In available products, this size appears in the BFGoodrich All-Terrain T/A KO2 series with a raised white letter sidewall treatment. It is the size to evaluate when maintaining stock-style wheel diameter while confirming wheel width, tire condition needs, and intended road use.
Tire fitment is consistent across the covered 1991 GMC Vans G3500 sub-models. That makes selection simpler, but it still helps to confirm the exact sub-model and wheel setup so the 225/75R16 radial choice matches the van as it sits today.
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1991 GMC Vans G3500 Rally
The 1991 GMC Vans G3500 Rally uses the same 225/75R16 radial fitment as the rest of the covered model range. Tire selection can stay focused on choosing the right product style and checking wheel compatibility rather than sorting through multiple primary sizes.
The 1991 GMC Vans G3500 Rally Ext. also uses 225/75R16 radial tires. That keeps fitment straightforward, so the main considerations are current wheel dimensions, load-related product specifications, and the type of driving the van is expected to handle.
The 1991 GMC Vans G3500 Rally STX shares the 225/75R16 radial tire size. With the primary fitment already established, the buyer can concentrate on tire design, sidewall appearance, and making sure the wheels remain correct for the selected tire.
The 1991 GMC Vans G3500 Rally STX Ext. uses the same 225/75R16 radial fitment. That means tire choice centers on the available product in the correct size and on confirming that the van has not been changed to a different wheel setup over time.
The 1991 GMC Vans G3500 Rally STX w/H.D. Suspension remains on the 225/75R16 radial size. The practical next step is comparing the available tire’s wheel-width compatibility and service-oriented specifications with the van’s actual use and current hardware.
The 1991 GMC Vans G3500 Rally w/H.D. Suspension uses 225/75R16 radial tires as its primary fitment. Since the size does not change, selecting a tire becomes a matter of matching the product’s character and wheel requirements to the vehicle’s present configuration.
The 1991 GMC Vans G3500 Vandura uses the same 225/75R16 radial size. That gives owners a clear starting point for replacement, with attention best spent on wheel compatibility, tire condition, and the kind of duty the van still performs.
The 1991 GMC Vans G3500 Vandura Ext. also uses 225/75R16 radial tires. Because the size stays consistent, buyers can focus on choosing an appropriate tire style and verifying that any older replacement wheels still match the tire’s required range.
The 1991 GMC Vans G3500 Vandura w/H.D. Suspension keeps the 225/75R16 radial fitment. For this sub-model, the most useful checks are wheel width, overall tire condition, and whether the van’s suspension and clearance remain suitable for the selected tire.
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 1991 GMC Vans G3500 Tires for Sale
Available 225/75R16 choices for the 1991 GMC Vans G3500 currently center on BFGoodrich, with the All-Terrain T/A KO2 series offering radial construction, a raised white letter sidewall, and rim-width compatibility that can be compared against the van’s existing 16-inch wheels.
These FAQs focus on 1991 GMC Vans G3500 tire size, 16-inch rim fitment, available radial choices, sidewall and brand selection, and the wheel, suspension, and condition checks that matter before regular road use.
Tire Size & Fitment
What tire size fits a 1991 GMC Vans G3500?
The 1991 GMC Vans G3500 uses a 225/75R16 tire size in radial construction. That fitment applies across the covered Rally and Vandura sub-models, including extended versions and the versions equipped with heavy-duty suspension.
Because there is one primary size for this model range, the main task is confirming that the van still has the correct 16-inch wheels and an appropriate wheel width for the tire being considered. Older full-size vans are often updated over time, so checking the actual wheel setup on the vehicle is just as important as knowing the original size.
What size rim does a 1991 GMC Vans G3500 use?
The 1991 GMC Vans G3500 uses a 16-inch rim with its 225/75R16 tire size. In the available product selection for this fitment, the tire is built for a rim-width range of 6.0 to 7.0 inches, which gives a useful wheel-compatibility reference point.
Rim diameter needs to match the tire exactly, so a 16-inch tire belongs only on a 16-inch wheel. Width matters too, especially on a heavy-duty van, because the tire should sit properly on the wheel and maintain the intended contact shape, load support, and clearance around suspension and body components.
Do all 1991 GMC Vans G3500 sub-models use the same tire size?
Yes. The covered 1991 GMC Vans G3500 sub-models all use the same 225/75R16 radial tire size. That includes Rally, Rally Ext., Rally STX, Rally STX Ext., Rally STX w/H.D. Suspension, Rally w/H.D. Suspension, Vandura, Vandura Ext., and Vandura w/H.D. Suspension.
Shared fitment makes shopping simpler, but it does not eliminate the need to inspect the van itself. A long-service vehicle may have replacement wheels, suspension changes, or wear-related clearance issues, so the smartest approach is to confirm the current wheel diameter and width before choosing among the available tires in 225/75R16.
Choosing the Right Tire
What should I consider when choosing a 225/75R16 tire for a 1991 GMC Vans G3500?
Start with the basics: correct size, radial construction, 16-inch rim compatibility, and wheel-width suitability. For the 1991 GMC Vans G3500, the available 225/75R16 product also brings details such as a 2,680-pound maximum load capacity at 80 psi, a 42-pound tire weight, and an all-terrain oriented design.
After the fitment is confirmed, think about how the van is actually used. A passenger-oriented Rally and a working Vandura may share the same size, but buyers may value different traits such as appearance, tread character, or duty-cycle confidence. Matching the tire to the van’s present role is more useful than choosing by size alone.
What sidewall styles are available for 1991 GMC Vans G3500 tires?
The available 225/75R16 product for the 1991 GMC Vans G3500 uses an RWL sidewall, meaning raised white letters. That creates a more truck-oriented, period-appropriate late-20th-century appearance than a plain blackwall tire, while still staying within the correct primary size.
Sidewall treatment affects presentation more than fitment, but it still matters on a full-size van with a lot of visible tire area. A raised white letter sidewall can suit a van with a more rugged look, while buyers aiming for a more understated appearance may want to compare how the sidewall style fits the vehicle’s restoration or use goals.
What brands offer tires for the 1991 GMC Vans G3500?
The available product selection for the 1991 GMC Vans G3500 includes BFGoodrich in the 225/75R16 size. The current offering is the All-Terrain T/A KO2 series, combining radial construction with a raised white letter sidewall and heavy-duty light-truck sizing details.
With a focused product selection, the buying decision becomes less about comparing many brands and more about confirming whether the available tire matches the van’s intended use. It helps to compare wheel-width compatibility, load-related specifications, tread character, and overall appearance against the way the van is driven and maintained now.
Restoration & Appearance
Which tire should I choose for a period-style 1991 GMC Vans G3500?
A period-style choice for a 1991 GMC Vans G3500 starts with the correct primary size, 225/75R16, on the proper 16-inch wheel. Since this van already uses a radial tire format, keeping the correct size and construction is the most important step in preserving an appearance that still feels right for the model’s era.
Tread style and sidewall treatment influence the van’s look from there. A more rugged all-terrain design with raised white letters creates a distinctly truck-oriented 1990s presentation, which may suit some builds better than others. Buyers pursuing exact originality should compare tire appearance against period photos, brochures, or marque-specific reference material.
Does correct tire fitment matter for a 1991 GMC Vans G3500 restoration?
Yes, correct tire fitment matters because tire size and wheel diameter strongly affect stance, wheelwell fill, and the overall character of a restored 1991 GMC Vans G3500. Using the proper 225/75R16 size helps keep the van visually grounded in the way this heavy-duty full-size platform was intended to sit.
Restoration-minded buyers should also pay attention to details beyond size alone. Sidewall style, tread presentation, and whether the van still wears its original wheel type can all change the finished look. Even when the tire size is correct, checking the actual wheel width and how the tire presents on the vehicle helps avoid an unintended visual mismatch.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 GMC Vans G3500?
Yes. Even though the 1991 GMC Vans G3500 uses a straightforward 225/75R16 tire size, modifications can change how that tire fits in practice. Aftermarket wheels, altered wheel width, suspension changes, lowered ride height, or body alterations can all affect clearance and the way the tire sits on the van.
A modified van should be checked at full steering lock and through normal suspension movement before regular use. It is also smart to confirm that the wheel remains 16 inches in diameter and falls within the tire’s suitable width range. Fitment on an older van depends on the vehicle as it exists today, not only on original specifications.
What should I inspect before driving a 1991 GMC Vans G3500 on new tires?
Look over the wheels, valve stems, lug hardware, brake components, and the suspension parts that affect tire clearance and tracking. On the tires themselves, verify correct size, inflation, and visible condition after mounting, then check for any rubbing points that might appear during steering or with the van loaded.
A full-size van places real demands on its tires, so the inspection should continue after the first few drives. Recheck pressure, look for uneven wear, and pay attention to vibration or pull that could point to alignment, wheel, or suspension issues. Early follow-up is especially useful on vehicles that have spent long periods parked or lightly used.
How should 225/75R16 tires on a collector 1991 GMC Vans G3500 be maintained?
Maintain 225/75R16 tires on a collector 1991 GMC Vans G3500 by keeping inflation appropriate for the tire and the van’s use, inspecting for cracking, bulges, cuts, tread wear, and air loss, and moving the vehicle often enough to avoid long-term flat spotting from extended storage.
Storage conditions matter more than many owners expect. Keeping the van away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve tire condition over time. Before any longer drive, inspect the tires closely and verify that age, wear, and general condition still support safe road use for a heavy full-size van.
