1980 GMC Trucks K2500 Tires

A 1980 GMC Trucks K2500 uses either 8.75R16.5 or 950-16.5, depending on the sub-model. Standard K2500 configurations with either 7/16 and 1/2 inch studs or 9/16 inch studs use 8.75R16.5 radial tires, while Bonus Cab front and rear positions use 950-16.5 bias-ply tires.

The important step is identifying the exact configuration before choosing a tire, because both sizes use a 16.5-inch rim and can look similar at a glance. A truck that has had wheel, axle, or suspension changes over the years should be checked carefully so the current setup still matches the intended tire size and construction.

The tire fitments covered for the 1980 GMC Trucks K2500 use a 16.5-inch rim diameter. That applies to both primary sizes on this page, including the 8.75R16.5 radial fitment and the 950-16.5 bias-ply fitment used on Bonus Cab front and rear applications.

Rim diameter is only part of the fitment picture on a heavy-duty truck like this. Wheel width also matters, especially for the 950-16.5 bias-ply options, and any truck that has been converted to a different wheel type should be measured rather than assumed to still be on the original 16.5-inch format.

The 1980 GMC Trucks K2500 has more than one tire size because tire 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 truck's exact configuration determines which size belongs on it.

That difference means a buyer should not choose by year and model name alone. Sub-model details, wheel setup, and whether the truck is a standard K2500 or a Bonus Cab matter first, especially on older trucks that may have had replacement axles, mixed wheels, or other service-related changes during their working life.

Start by confirming that the truck is a Bonus Cab application that uses the 950-16.5 bias-ply size. In this size, the available choices are STA Traxion and STA Super Transport, both Blackwall bias-ply truck tires with a Military & Truck focus and the same listed maximum load capacity of 2780@60 psi.

Selection then comes down to matching the intended use and wheel setup. Both products call for a 16.5-inch rim and a 6.50 to 6.75-inch rim width, so the current wheels should be checked before purchase, especially if the truck has seen wheel swaps or long-term commercial service.

The available 950-16.5 products for the 1980 GMC Trucks K2500 come from STA. Those offerings include the Traxion and Super Transport series, both built as bias-ply Blackwall truck tires for the Bonus Cab fitment that uses this size.

Brand choice is only useful after the correct sub-model and tire size have been confirmed, since standard K2500 configurations use 8.75R16.5 radial tires instead. Once the truck's exact fitment is clear, compare the available series by construction, rim-width requirements, load specification, and the truck's planned use.

For the 950-16.5 Bonus Cab fitment on the 1980 GMC Trucks K2500, the available tire series are STA Traxion and STA Super Transport. Both are bias-ply Blackwall truck tires and both carry the Military & Truck designation, so the basic character stays consistent across the two choices.

A series comparison is most useful when the correct size has already been confirmed. Since both options share the same 16.5-inch rim diameter, the same 6.50 to 6.75-inch rim-width range, and the same listed load figure, the decision becomes one of product preference within the proper bias-ply truck fitment.

A period-style choice starts with using the tire size and construction that belong to the truck's exact configuration. Standard K2500 setups use 8.75R16.5 radial tires, while Bonus Cab front and rear applications use 950-16.5 bias-ply tires, so the right appearance begins with correct fitment rather than with a brand name alone.

For Bonus Cab trucks, the available 950-16.5 options keep a traditional Blackwall heavy-duty look that suits a work-focused restoration. Owners chasing exact historical accuracy beyond size and construction should compare the truck against period photos, factory literature, and marque-specific references before settling on a final product.

Correct tire fitment matters on a 1980 GMC Trucks K2500 restoration because tire size and construction affect the truck's stance, visual balance, and overall character. On this model, the difference between an 8.75R16.5 radial standard fitment and a 950-16.5 bias-ply Bonus Cab fitment is a meaningful part of presenting the truck properly.

Fitment also influences whether the finished truck looks coherent from front to rear and whether the wheel setup matches the tire being installed. Even on a restoration that is meant for driving rather than show judging, checking sub-model details and wheel dimensions helps avoid a result that looks or functions out of place.

Yes, modifications can affect tire fitment on a 1980 GMC Trucks K2500. Wheel changes, axle swaps, suspension lifts, lowering, brake conversions, and body alterations can all change the space available around the tire or alter whether the truck still uses the original 16.5-inch wheel format tied to these sizes.

A truck that now wears aftermarket wheels should be measured instead of relying on the original fitment alone. Checking wheel diameter, wheel width, and clearance at the front and rear is especially important here because this model already uses different tire sizes across certain sub-models and Bonus Cab positions.

Before driving a 1980 GMC Trucks K2500 on new tires, inspect the wheels, valve stems, lug hardware, and overall wheel condition, then verify that the installed tire size matches the truck's exact configuration. The suspension, steering components, and alignment should also be in sound condition so the new tires are not asked to compensate for worn mechanical parts.

A short test drive followed by a second inspection is a smart next step on an older heavy-duty truck. Look for rubbing, uneven seating, air loss, or any sign that wheel width or clearance is marginal, especially if the truck has sat for long periods or has been modified during its service life.

Tires on a collector 1980 GMC Trucks K2500 should be kept clean, properly inflated, and inspected regularly for cracking, bulges, cuts, uneven wear, and slow air loss. Older trucks that see limited mileage often age their tires out before they wear them out, so condition matters as much as tread depth.

Storage habits also play a major role in tire life. Keeping the truck away from prolonged sunlight, excess heat, moisture, and ozone sources helps preserve the tires, and periodic movement can help avoid long-term flat spotting on a vehicle that sits for extended periods between drives.