1981 GMC Trucks K2500 Tires

A 1981 GMC Trucks K2500 can use either 8.75R16.5 or 950-16.5, depending on the exact sub-model. Standard K2500 configurations use 8.75R16.5 in radial construction, while Bonus Cab front and rear applications use 950-16.5 in bias-ply construction.

The important part is confirming the truck's exact configuration before selecting a tire. Both fitments use a 16.5-inch rim, so wheel diameter alone does not separate them. Check whether the truck is a standard K2500 or a Bonus Cab model, and make sure any past wheel or suspension changes have not altered the setup.

The 1981 GMC Trucks K2500 uses a 16.5-inch rim with both of its primary tire fitments. That applies to the 8.75R16.5 radial size and the 950-16.5 bias-ply size, so the wheel diameter stays the same even though the tire constructions differ.

Rim diameter is only one part of the fitment picture. Wheel width, sub-model, and overall truck setup still need to be checked, especially on older trucks that may have been modified over time. A 16.5-inch wheel is essential here, but it does not mean both tire sizes belong on every 1981 GMC Trucks K2500.

The 1981 GMC Trucks K2500 has more than one tire size because fitment changes by sub-model. Standard K2500 versions use 8.75R16.5 radial tires, while Bonus Cab front and rear positions use 950-16.5 bias-ply tires, so the size difference is tied to the truck's specific configuration.

That means tire selection starts with identification, not assumption. Two trucks that both say K2500 can still require different tires if one is a Bonus Cab setup and the other is not. Before replacing anything, verify the sub-model, wheel size, and the truck's existing tire and wheel combination so the new set matches the application.

Start with the correct primary size for the exact truck. A standard 1981 GMC Trucks K2500 uses 8.75R16.5 radial tires, while Bonus Cab configurations use 950-16.5 bias-ply tires, so size and construction both matter before comparing individual tire options.

After confirming fitment, look at how the truck will be used and how you want it to present. On 950-16.5, the available STA options differ by series, with Traxion and Super Transport offering two traditional truck-tire choices. Wheel width, load needs, and any non-stock changes should be checked before settling on a final selection.

The available 950-16.5 tire options for the 1981 GMC Trucks K2500 come from STA. Those choices are built as bias-ply truck tires and are aimed at traditional heavy-duty applications rather than modern light-truck styling.

Brand is only one part of the decision. Within the available STA lineup, the more useful comparison is between the Traxion and Super Transport series, along with their rim-width compatibility, load specification, and overall truck-oriented character. Choosing the right tire still depends first on confirming that the truck actually uses the 950-16.5 Bonus Cab fitment.

For the 1981 GMC Trucks K2500 in 950-16.5, the available tire series are STA Traxion and STA Super Transport. Both are blackwall bias-ply truck tires sized for 16.5-inch rims and suited to a traditional heavy-duty pickup appearance.

Series choice becomes relevant after the fitment is confirmed. Since both options share the same basic size and construction, the decision is more about the style of truck tire you want within that correct 950-16.5 application. It also helps to compare rim-width guidance and load specification against the wheels and intended use of the truck.

A period-style choice starts with using the tire size and construction that match the truck's actual sub-model. Standard 1981 GMC Trucks K2500 configurations use 8.75R16.5 radial tires, while Bonus Cab versions use 950-16.5 bias-ply tires, so appearance and fitment are tied together from the beginning.

For a restoration-oriented truck, the goal is usually to preserve the correct overall look and stance rather than simply mount any 16.5-inch tire. The available 950-16.5 options keep a traditional blackwall truck presentation. If exact originality matters beyond size and construction, marque-specific references and historical vehicle documentation are worth checking before making a final choice.

Tire construction changes more than ride feel on a restored 1981 GMC Trucks K2500; it also affects the truck's visual character. An 8.75R16.5 radial presents differently from a 950-16.5 bias-ply, and the right look depends on whether the truck is a standard K2500 or a Bonus Cab configuration.

On a restoration-focused build, construction should follow the proper fitment first and appearance second. A bias-ply truck tire usually supports a more traditional heavy-duty presentation, while the radial fitment belongs to the standard K2500 applications covered here. Matching the tire type to the truck's actual setup helps the finished vehicle look consistent and intentional.

Yes. Modifications can change how a tire fits on a 1981 GMC Trucks K2500 even when the size itself is correct for the original configuration. Aftermarket wheels, altered wheel width, suspension lifts, lowering, brake changes, or body work can all influence clearance and the way the tire sits on the truck.

That matters on this application because both primary sizes use 16.5-inch wheels, but they do not serve the same sub-models. If the truck has been changed from stock, verify wheel diameter, wheel width, and clearance at steering lock and suspension travel. A collector truck with older modifications deserves the same fitment check as a freshly built one.

Before driving a 1981 GMC Trucks K2500 on new tires, inspect the wheels, valve stems, lug hardware, and overall condition of the suspension and steering components. It also makes sense to confirm the truck has the correct tire size for its exact sub-model and that the wheels are truly 16.5-inch rims.

A short test drive should be paired with another look for air loss, rubbing, or uneven seating. On an older truck, tire replacement is also a good time to check for fender clearance, brake drag, and any signs that past wheel or suspension work changed the fitment. A careful inspection helps the truck return to road use with fewer surprises.

Tires on a collector 1981 GMC Trucks K2500 should be maintained with regular pressure checks, routine visual inspection, and attention to age-related deterioration. Even low-mileage vintage trucks can develop sidewall cracking, flat spotting, air loss, or tread issues simply from long storage and limited use.

Good maintenance also means storing the truck away from prolonged sunlight, excess heat, moisture, and ozone sources when possible. Inspect the tires before each drive, especially after the truck has been sitting for a while. On a K2500, it is also wise to keep the wheel and tire setup matched to the correct sub-model so maintenance starts from the right fitment.