The 1980 GMC Trucks C2500 sits in an era when heavy-duty pickups were expected to work hard, carry weight, and adapt to a wide range of wheel and chassis configurations. That makes tire selection on this truck more involved than it is on many passenger cars, especially when GVWR, stud size, and wheel diameter come into play. The 1980 GMC Trucks C2500 uses both radial and bias-ply primary fitments, with 16-inch and 16.5-inch wheel applications across the covered configurations. That also means the decision is not just about size, but about choosing the correct construction and wheel match for the exact truck. A restoration-minded truck and a work-focused survivor may approach that choice differently.
Which Tire Size Is Right for The 1980 GMC Trucks C2500
Four primary tire sizes apply to the 1980 GMC Trucks C2500, and they do not all serve the same truck configuration. Fitment varies by sub-model, with both 16-inch and 16.5-inch wheel applications and a split between radial and bias-ply construction. The first step is confirming the exact sub-model and wheel diameter before comparing tire choices, since that determines which size family belongs on the truck.
Fit(s): (7/16 & 1/2 inch studs)(GVWR 6400) and (9/16 inch studs)(GVWR 6400)
Construction: Radial|Rim: 16 in
7.50R16 is a numeric radial size in which 7.50 refers to the nominal section width in inches, the R indicates radial construction, and 16 identifies the rim diameter. On the 1980 GMC Trucks C2500, this size belongs to certain 6400 GVWR configurations that use 16-inch wheels. Its radial construction makes it a distinct fitment path from the truck's 16.5-inch applications. Choosing this size starts with confirming that the truck actually has the correct 16-inch wheel setup rather than a later or alternate 16.5-inch arrangement.
Fit(s): (7/16 & 1/2 inch studs)(GVWR 6400) and (9/16 inch studs)(GVWR 6400)
Construction: Radial|Rim: 16.5 in
8.75R16.5 uses a vintage-style numeric radial format, with 8.75 indicating nominal section width, R for radial construction, and 16.5 for the wheel diameter. This size appears on certain 6400 GVWR C2500 configurations that use 16.5-inch wheels instead of 16-inch wheels. It is part of the truck's original-style heavy-duty fitment story and should be treated as a specific wheel match, not a general substitute for every C2500. Owners should confirm both wheel diameter and the exact truck configuration before selecting this size.
Fit(s): (7/16 & 1/2 inch studs)(GVWR 6400) and (9/16 inch studs)(GVWR 6400)
Construction: Radial|Rim: 16.5 in
9.50R16.5 is another numeric radial size, with 9.50 representing nominal section width, R showing radial construction, and 16.5 marking the wheel diameter. On the 1980 GMC Trucks C2500, it is used on certain 6400 GVWR versions that run a 16.5-inch wheel. This size gives the truck a different fitment path from the narrower 7.50R16 setup and from the bias-ply 950-16.5 application. Selection should focus on the truck's actual wheels and intended presentation, especially if the vehicle has been modified or had wheels changed over time.
Fit(s): (7/16 & 1/2 inch studs)(GVWR 8600), (9/16 inch studs)(GVWR 8600), Bonus Cab (7/16 & 1/2 inch studs) Front, Bonus Cab (7/16 & 1/2 inch studs) Rear, Bonus Cab (9/16 inch studs) Front, and Bonus Cab (9/16 inch studs) Rear
Construction: Bias Ply|Rim: 16.5 in
950-16.5 is a numeric bias-ply size in which 950 represents a nominal 9.50-inch section width and 16.5 identifies the rim diameter. On the 1980 GMC Trucks C2500, this size is tied to 8600 GVWR applications and the Bonus Cab front and rear fitments shown here. Available products in this size come from STA in the Traxion and Super Transport series, both in Blackwall form and built for Military & Truck use. This size is the right place to focus when preserving the truck's bias-ply heavy-duty character on a correct 16.5-inch wheel.
Sub-model fitment on the 1980 GMC Trucks C2500 is not one-size-fits-all. GVWR, stud size, and Bonus Cab front or rear position affect which tire size and construction belong on the truck, so identifying the exact configuration matters before choosing a tire.
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1980 GMC Trucks C2500 (7/16 & 1/2 inch studs)(GVWR 6400)
This 6400 GVWR configuration uses radial tire fitments rather than the truck's 950-16.5 bias-ply application. Tire selection starts with confirming which wheel diameter is actually on the truck, since both 16-inch and 16.5-inch radial sizes appear within this setup.
1980 GMC Trucks C2500 (7/16 & 1/2 inch studs)(GVWR 8600)
This 8600 GVWR version uses the 950-16.5 bias-ply fitment. That makes the main decision less about choosing among multiple sizes and more about selecting the right 16.5-inch bias-ply tire for the truck's intended look, use, and wheel compatibility.
1980 GMC Trucks C2500 (9/16 inch studs)(GVWR 6400)
This 6400 GVWR configuration also uses radial tire fitments instead of the 950-16.5 bias-ply setup. The key step is verifying the actual wheel diameter on the truck, because the applicable radial sizes span both 16-inch and 16.5-inch wheel applications.
1980 GMC Trucks C2500 (9/16 inch studs)(GVWR 8600)
This 8600 GVWR configuration uses the 950-16.5 bias-ply size. Owners of this setup should focus on preserving the correct wheel match and selecting among the available bias-ply truck tires rather than treating the radial sizes as interchangeable alternatives.
1980 GMC Trucks C2500 Bonus Cab (7/16 & 1/2 inch studs) Front
The Bonus Cab front fitment shown here uses 950-16.5 in bias-ply construction. That points the selection process toward proper 16.5-inch wheel compatibility and a truck-oriented bias-ply tire rather than the radial sizes used on other C2500 configurations.
The Bonus Cab rear fitment also uses 950-16.5 bias-ply tires. Owners should match that rear application carefully and confirm that wheel condition, width, and overall setup remain appropriate for a heavy-duty 16.5-inch bias-ply truck tire.
1980 GMC Trucks C2500 Bonus Cab (9/16 inch studs) Front
This Bonus Cab front configuration uses 950-16.5 in a bias-ply construction. Tire choice centers on maintaining the correct 16.5-inch fitment and selecting a truck-oriented bias-ply design that suits the vehicle's restoration or working-truck presentation.
1980 GMC Trucks C2500 Bonus Cab (9/16 inch studs) Rear
This Bonus Cab rear configuration uses the same 950-16.5 bias-ply size. That keeps the focus on correct wheel compatibility and choosing between the available tire series in that size rather than searching across multiple rear tire dimensions.
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 1980 GMC Trucks C2500 Tires for Sale
Available 950-16.5 choices for the 1980 GMC Trucks C2500 come from STA in the Traxion and Super Transport series. Both are Blackwall bias-ply truck tires with Military & Truck attributes, and both are made to order for 16.5-inch wheel applications.
Owners of a 1980 GMC Trucks C2500 usually need to sort out exact tire size, wheel diameter, construction type, and sub-model fitment before choosing a tire. These FAQs focus on the questions that matter most when matching tires to this truck.
Tire Size & Fitment
What tire size fits a 1980 GMC Trucks C2500?
The 1980 GMC Trucks C2500 uses four primary tire sizes across the covered configurations: 7.50R16, 8.75R16.5, 9.50R16.5, and 950-16.5. The first three are radial sizes, while 950-16.5 is a bias-ply size used on certain heavier-duty and Bonus Cab applications.
That means tire selection starts with identifying the truck's exact sub-model, GVWR grouping, and wheel diameter. A C2500 with 16-inch wheels follows a different path than one with 16.5-inch wheels, and a 6400 GVWR configuration is not the same as an 8600 GVWR setup when it comes to tire fitment.
What size rim does a 1980 GMC Trucks C2500 use?
A 1980 GMC Trucks C2500 can use either a 16-inch rim or a 16.5-inch rim, depending on the specific configuration. The 7.50R16 radial fits a 16-inch wheel, while 8.75R16.5, 9.50R16.5, and 950-16.5 all belong to 16.5-inch wheel applications.
Rim diameter is the first thing to verify before ordering tires for this truck. A 16-inch tire and a 16.5-inch tire are not interchangeable, even when the section widths appear similar, so the wheel itself needs to be confirmed rather than relying on a general C2500 assumption.
Why does the 1980 GMC Trucks C2500 have more than one tire size?
More than one tire size appears on the 1980 GMC Trucks C2500 because fitment changes with sub-model details such as GVWR, stud size, and Bonus Cab front or rear application. The truck also spans both radial and bias-ply fitments, along with 16-inch and 16.5-inch wheel diameters.
That variety is typical of a heavy-duty pickup offered in multiple working configurations. Instead of treating every 1980 C2500 the same, the safer approach is to match the tire to the truck's exact setup and confirm that the wheels currently on the vehicle still match that intended fitment.
Bias-Ply & Radial Options
Is 950-16.5 a bias-ply or radial tire for the 1980 GMC Trucks C2500?
For the 1980 GMC Trucks C2500, 950-16.5 is a bias-ply tire size. It appears on the 8600 GVWR configurations and on the Bonus Cab front and rear applications covered here, making it the truck's bias-ply heavy-duty fitment within this group.
That matters because it places the truck on a different construction path from the radial 7.50R16, 8.75R16.5, and 9.50R16.5 fitments. Owners should match 950-16.5 to a proper 16.5-inch wheel and think through whether the goal is preserving the original-style bias-ply presentation or comparing a different truck setup altogether.
Should I use bias-ply or radial tires on a 1980 GMC Trucks C2500?
The right choice depends on which 1980 GMC Trucks C2500 configuration is being fitted. Some covered versions use radial sizes such as 7.50R16, 8.75R16.5, or 9.50R16.5, while others use the 950-16.5 bias-ply size, so the truck's actual sub-model and wheel setup come first.
Once that is confirmed, the decision becomes one of keeping the construction type tied to that fitment or evaluating a different overall setup with care. A bias-ply truck preserved for a traditional appearance may follow a different path than a radial-equipped C2500 that is already built around its original wheel diameter and fitment range.
What should I check before converting my 1980 GMC Trucks C2500 from bias-ply to radial tires?
Start by confirming whether the truck's current fitment is one of the 950-16.5 bias-ply applications or one of the radial configurations already used on other 1980 GMC Trucks C2500 setups. Wheel diameter is critical, because the truck spans both 16-inch and 16.5-inch applications.
A conversion also calls for checking wheel width, overall tire dimensions, steering clearance, fender clearance, and the truck's intended load use. Since this C2500 family includes several configurations rather than one universal setup, any construction change should be evaluated against the actual wheels and chassis that are on the truck now.
Choosing the Right Tire
What should I consider when choosing a 950-16.5 tire for a 1980 GMC Trucks C2500?
A 950-16.5 tire for the 1980 GMC Trucks C2500 should first be matched to a truck configuration that actually uses that size, including the correct 16.5-inch wheel. From there, the available choices center on bias-ply construction, Blackwall styling, truck-oriented design, and the tire series being considered.
The two available 950-16.5 options differ by series, weight, and stated rim-width compatibility, so those details are worth comparing alongside the truck's intended use. A restoration-oriented truck may prioritize traditional appearance, while a working survivor may place more emphasis on matching the tire to wheel condition and service demands.
What sidewall styles are available for 1980 GMC Trucks C2500 tires?
The available 950-16.5 products for the 1980 GMC Trucks C2500 are offered in Blackwall form. That suits the truck-oriented character of this heavy-duty bias-ply fitment and keeps the appearance straightforward for owners focusing on utility, restoration-minded presentation, or an authentic work-truck look.
Sidewall style still matters because it affects how the truck presents visually even when the tire size is correct. A buyer choosing among available 950-16.5 products is really comparing series and specifications within that Blackwall look, rather than deciding between decorative sidewall treatments such as stripes or whitewalls.
What tire series are available for the 1980 GMC Trucks C2500?
For the 950-16.5 fitment on the 1980 GMC Trucks C2500, the available tire series are STA Traxion and STA Super Transport. Both are bias-ply Blackwall truck tires built around the same size and 16.5-inch application, but they remain distinct product lines within that fitment.
Comparing tire series is useful when more than one option exists in the correct size. Along with series name, it makes sense to review rim-width compatibility, weight, and load specification so the tire chosen matches the truck's wheel setup and the way the vehicle is expected to be used or presented.
Restoration & Appearance
Which tire should I choose for a period-style 1980 GMC Trucks C2500?
A period-style 1980 GMC Trucks C2500 starts with the tire size and construction that belong on the truck's exact configuration. That may mean one of the radial fitments on a 6400 GVWR application or the 950-16.5 bias-ply size on certain 8600 GVWR and Bonus Cab applications.
Appearance follows fitment, not the other way around. Owners pursuing a faithful restoration-style presentation should confirm the truck's wheels, GVWR grouping, and intended configuration first, then choose a tire whose construction and sidewall treatment support that look without assuming every C2500 left the factory on the same setup.
Does correct tire fitment matter for a 1980 GMC Trucks C2500 restoration?
Correct tire fitment matters on a 1980 GMC Trucks C2500 restoration because the truck was offered with more than one size, more than one wheel diameter, and both radial and bias-ply applications. A truck restored with the wrong size family can look out of character even before road-use issues are considered.
The best restoration result usually comes from confirming the exact configuration being represented and matching the tire to that setup. When originality is especially important, truck-specific literature, build information, or marque expertise can help refine the final choice between the correct fitment paths shown for this model year.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1980 GMC Trucks C2500?
Yes, modifications can affect tire fitment on a 1980 GMC Trucks C2500. Aftermarket wheels, suspension changes, altered ride height, or body modifications can change the relationship between the tire, the wheel opening, and the steering or suspension components, even when the tire size itself appears close to the original fitment.
That is especially important on a truck that already spans both 16-inch and 16.5-inch applications from the factory fitment range. Any modified C2500 should have its actual wheel diameter, wheel width, and available clearance checked before a tire is selected, rather than assuming the original catalog size still applies unchanged.
What should I inspect before driving a 1980 GMC Trucks C2500 on new tires?
Before driving a 1980 GMC Trucks C2500 on new tires, inspect the wheels for the correct diameter and sound condition, then confirm proper mounting and inflation. It is also wise to look over the suspension, steering components, and brake hardware so the new tires are not being asked to work around an avoidable chassis issue.
A short clearance check is equally important, particularly on trucks that may have had wheel or suspension changes over the years. Turning clearance, fender space, and any signs of rubbing should be checked early, and a careful first drive can help confirm that the new tire setup behaves as expected under real road use.
How should 950-16.5 tires on a collector 1980 GMC Trucks C2500 be maintained?
950-16.5 tires on a collector 1980 GMC Trucks C2500 should be maintained with regular pressure checks, visual inspection, and attention to age-related condition as well as tread wear. A low-mileage truck can still develop sidewall cracking, flat spotting, air loss, or other storage-related issues even when the tires see limited road time.
Storage habits matter as much as mileage on an older truck tire. Keeping the vehicle away from prolonged sunlight, excess heat, and ozone sources can help preserve condition, and the tires should be examined before longer drives so any signs of bulges, cuts, or deterioration are caught before the truck returns to regular road use.
