The 1991 GMC Trucks C3500 sits in the final years of GMC’s square-body heavy-duty pickup era, a time when one-ton trucks were expected to haul, tow, and work hard without giving up everyday road manners. For a dual-rear-wheel C3500, tire choice centers on two distinct directions: the modern 225/75R16 radial fitment and the vintage 750-16 bias-ply size, both built around a 16-inch rim. That creates a very different buying decision depending on whether the truck is being kept in practical road-going trim or finished with a more traditional presentation. Sidewall style, tire series, load-minded construction, and wheel compatibility all deserve a careful look before choosing.
Which Tire Size Is Right for The 1991 GMC Trucks C3500
The 1991 GMC Trucks C3500 uses two primary tire sizes, and the difference is tied more to construction choice than to wheel diameter since both are built for 16-inch rims. The first step is confirming whether your truck is being matched to the modern 225/75R16 radial setup or the vintage 750-16 bias-ply format, then choosing the tire style and series that best suit the truck’s use and appearance.
Fit(s): Sierra (DRW), Sierra (DRW) Front, Sierra (DRW) Rear, Sierra SLE (DRW), Sierra SLE (DRW) Front, Sierra SLE (DRW) Rear, Sierra SLX (DRW), Sierra SLX (DRW) Front, and Sierra SLX (DRW) Rear
Construction: Radial|Rim: 16 in
225/75R16 is a metric radial size where 225 identifies nominal section width in millimeters, 75 is the aspect ratio, R denotes radial construction, and 16 is the rim diameter in inches. On the 1991 GMC Trucks C3500, this size represents the modern radial fitment path and is also used on the front and rear DRW positions called out separately. Available product choice in this size is centered on BFGoodrich with the All-Terrain T/A KO2 in raised white letter form. It is the size to evaluate when road use, modern radial construction, and correct 16-inch wheel compatibility are the main priorities.
Fit(s): Sierra (DRW), Sierra SLE (DRW), and Sierra SLX (DRW)
Construction: Bias Ply|Rim: 16 in
750-16 is a numeric bias-ply size in which 7.50 refers to the nominal section width in inches and 16 identifies the rim diameter. For the 1991 GMC Trucks C3500, this size serves buyers looking at a traditional bias-ply tire, whether the goal is a truck-oriented blackwall, an NDT or transport-style tread, or a restoration-leaning wide whitewall presentation. Firestone, BFGoodrich, Lester, and STA all appear in this size across several tire series and sidewall styles. It is the size to study closely when the truck’s visual character matters as much as basic fitment.
Sub-model fitment on the 1991 GMC Trucks C3500 is mostly straightforward, but it still helps to confirm whether you are looking at the overall DRW truck or the separately called-out front and rear positions. The full DRW Sierra, Sierra SLE, and Sierra SLX entries include both the radial and bias-ply size paths, while the front and rear position entries center on 225/75R16 radial fitment.
1
1991 GMC Trucks C3500 Sierra (DRW)
The C3500 Sierra (DRW) can be matched to either 225/75R16 radial tires or 750-16 bias-ply tires on 16-inch rims. That gives the buyer a clear choice between a more modern radial setup and a more traditional bias-ply presentation, with wheel width and intended truck use worth checking before selection.
The C3500 Sierra (DRW) Front uses 225/75R16 radial tires. That makes front-position selection more focused, with the key questions shifting from size choice to tire type, wheel compatibility, and whether the truck still carries its intended radial-oriented setup.
The C3500 Sierra (DRW) Rear also uses 225/75R16 radial tires. Rear tire selection should stay focused on the proper radial size, while paying close attention to the actual dual-wheel arrangement, wheel condition, and any changes that may affect clearance between the paired rear tires.
The C3500 Sierra SLE (DRW) shares the same two fitment directions: 225/75R16 in radial construction and 750-16 in bias-ply form. Choosing between them depends less on trim name than on whether the truck is being maintained for practical use, traditional appearance, or a specific wheel-and-tire style.
The C3500 Sierra SLE (DRW) Front uses 225/75R16 radial tires. With size already narrowed down, the main buying considerations become the tire’s intended road use, the correct 16-inch wheel setup, and keeping the front axle matched to the truck’s overall tire plan.
The C3500 Sierra SLE (DRW) Rear uses 225/75R16 radial tires. For a dual-rear-wheel truck, that means verifying the rear wheel arrangement and making sure the tire chosen suits the truck’s working role without overlooking spacing and clearance concerns.
The C3500 Sierra SLX (DRW) can use either the 225/75R16 radial size or the 750-16 bias-ply size, both on 16-inch rims. That opens the door to either a modern radial truck tire or a more traditional bias-ply choice with blackwall or wide whitewall styling depending on the direction of the build.
The C3500 Sierra SLX (DRW) Front uses 225/75R16 radial tires. Selection is therefore less about comparing multiple sizes and more about confirming the front wheel setup, radial construction, and the truck’s real-world use before choosing a tire.
The C3500 Sierra SLX (DRW) Rear uses 225/75R16 radial tires. On the rear of a dually truck, tire choice should be made with close attention to the actual wheel pairing, tire condition across the set, and any suspension or wheel changes that could affect spacing.
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 Trucks C3500 Tires for Sale
Available 1991 GMC Trucks C3500 tire choices split into two distinct groups: a BFGoodrich 225/75R16 radial with raised white letters, and a much broader 750-16 bias-ply selection from Firestone, BFGoodrich, Lester, and STA in blackwall and wide whitewall styles plus several truck-oriented series.
Owners of a 1991 GMC Trucks C3500 usually need to sort out the correct tire size, the difference between the radial and bias-ply fitments, and how product style affects a truck’s appearance and road use. These FAQs focus on those exact decisions, along with wheel checks and basic pre-drive inspection points.
Tire Size & Fitment
What tire size fits a 1991 GMC Trucks C3500?
The 1991 GMC Trucks C3500 uses two primary tire sizes: 225/75R16 in radial construction and 750-16 in bias-ply construction. Both sizes are built around a 16-inch rim, but they represent different tire formats and very different buying directions for the truck.
Choosing between them starts with confirming how the truck is set up now and what kind of use or appearance is expected. A truck kept in a more modern road-going configuration may stay with 225/75R16 radial tires, while a more traditional or restoration-oriented build may point toward 750-16 bias-ply tires.
What size rim does a 1991 GMC Trucks C3500 use?
Both supported tire sizes for the 1991 GMC Trucks C3500 use a 16-inch rim diameter. That includes the 225/75R16 radial fitment and the 750-16 bias-ply fitment, so wheel diameter does not change between the two primary size paths.
Rim diameter is only part of the check, especially on a one-ton dual-rear-wheel truck. Wheel width, the actual dually wheel setup, and the tire’s own approved rim-width range still need to be compared before choosing between the radial and bias-ply options or before replacing one construction type with the other.
Do all 1991 GMC Trucks C3500 sub-models use the same tire size?
Not exactly. The Sierra (DRW), Sierra SLE (DRW), and Sierra SLX (DRW) entries each show both 225/75R16 radial and 750-16 bias-ply fitments, while the separately called-out front and rear positions for those trucks use 225/75R16 radial tires.
That means the buyer should confirm whether the truck is being matched as a full DRW model or as a specific front or rear position entry. Once that is clear, the next step is deciding whether the truck should remain on its radial setup or be evaluated in the bias-ply size path.
Bias-Ply & Radial Options
Is 750-16 a bias-ply or radial tire for the 1991 GMC Trucks C3500?
On the 1991 GMC Trucks C3500, 750-16 is a bias-ply tire size. It uses the older numeric sizing format and appears here in traditional bias-ply form across several product families, including blackwall truck tires and wide whitewall options.
That matters because a 750-16 bias-ply tire is not the same type of fitment as the truck’s 225/75R16 radial option, even though both use 16-inch rims. Anyone moving between those constructions should compare wheel width, overall vehicle setup, and the truck’s intended use instead of treating the two paths as automatic substitutes.
Is 225/75R16 a bias-ply or radial tire for the 1991 GMC Trucks C3500?
For the 1991 GMC Trucks C3500, 225/75R16 is a radial tire size. It uses modern metric sizing, and the available product in this fitment is a BFGoodrich radial truck tire built for a 16-inch rim.
That makes 225/75R16 the more modern construction path on this truck, particularly for buyers keeping a practical road-going setup. Before replacing existing tires, it is still worth confirming the actual wheel width and checking that the truck has not been altered with different wheels, suspension changes, or other modifications that could affect tire selection.
Should I use bias-ply or radial tires on a 1991 GMC Trucks C3500?
The choice depends on how the 1991 GMC Trucks C3500 is being used and how the truck is meant to look. The 225/75R16 size keeps the truck in a radial format, while 750-16 opens the door to a traditional bias-ply presentation with several truck and wide whitewall styles.
A work-focused or regularly driven truck may stay closer to the radial path, while a restoration-minded or style-driven build may favor the bias-ply option. Either way, the decision should be made after confirming wheel compatibility, keeping front and rear fitment consistent where required, and checking the truck’s actual dual-wheel arrangement.
Choosing the Right Tire
What should I consider when choosing a 225/75R16 or 750-16 tire for a 1991 GMC Trucks C3500?
Start with the correct primary size and construction for the truck’s setup. On the 1991 GMC Trucks C3500, that means deciding between the 225/75R16 radial fitment and the 750-16 bias-ply fitment, then narrowing the choice by intended use, tire series, sidewall appearance, and approved wheel dimensions.
A truck that is driven regularly may point toward the radial option, while a more traditional build may lead toward one of the many 750-16 bias-ply choices. It also helps to compare load figures where they are given, especially on a heavy-duty dually, and to make sure the wheel setup matches the tire being considered.
What sidewall styles are available for 1991 GMC Trucks C3500 tires?
Sidewall choice varies quite a bit on the 1991 GMC Trucks C3500. The 225/75R16 radial option is available with raised white letters, while the 750-16 bias-ply size includes blackwall and wide whitewall styles depending on the tire series and brand.
That gives the truck two very different visual directions. Raised white letters tend to suit a later truck look, blackwalls keep the presentation more utilitarian, and wide whitewalls create a more custom or restoration-oriented appearance. Sidewall style should be chosen after size and construction are settled, not as the first fitment decision.
What brands offer tires for the 1991 GMC Trucks C3500?
Available brands for the 1991 GMC Trucks C3500 include BFGoodrich, Firestone, Lester, and STA. BFGoodrich covers the 225/75R16 radial option and also appears in 750-16 bias-ply form, while Firestone, Lester, and STA provide several 750-16 bias-ply choices across different series and sidewall styles.
Brand should be considered alongside the tire’s construction, sidewall treatment, and intended truck use rather than in isolation. A buyer comparing options in 750-16 will see much more variation in series and appearance, while the 225/75R16 path is simpler and centered on one radial truck-tire offering.
Restoration & Appearance
Which tire should I choose for a period-style 1991 GMC Trucks C3500?
A period-style 1991 GMC Trucks C3500 usually starts with deciding whether the truck should keep a later-model radial look or move toward a more traditional bias-ply presentation. The 750-16 size is the more appearance-driven path here, with blackwall truck tires as well as wide whitewall bias-ply options.
That does not automatically make one choice more historically exact than another, because trim, wheel setup, and the truck’s intended style all matter. Buyers chasing originality should compare the truck against marque references or surviving examples, while buyers building for visual character can use the available sidewall and series choices more freely.
How does tire construction affect the appearance of a restored 1991 GMC Trucks C3500?
Construction changes the look of the truck as much as the ride or handling character. On a 1991 GMC Trucks C3500, the 225/75R16 radial route creates a more modern heavy-duty pickup presentation, while the 750-16 bias-ply route gives the truck a more traditional stance and opens up blackwall or wide whitewall styling.
That visual difference becomes especially noticeable on a dual-rear-wheel truck where the tires are a strong part of the overall profile. Anyone restoring for a specific era impression should settle the wheel-and-tire look early, because construction type, sidewall treatment, and tread style all influence how finished the truck appears.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 GMC Trucks C3500?
Yes. Wheel changes, suspension alterations, lowering, or non-stock dually hardware can all affect tire fitment on a 1991 GMC Trucks C3500 even when the tire size itself is one of the accepted options. That is especially important on a dual-rear-wheel truck where spacing and clearance matter at both the front axle and the rear pairings.
A truck with aftermarket wheels should be checked for actual rim width and diameter before ordering either 225/75R16 radial tires or 750-16 bias-ply tires. Clearance at the fenders, steering travel, and the gap between dual rear tires also deserve a close look so the chosen tire works with the truck’s real setup.
What should I inspect before driving a 1991 GMC Trucks C3500 on new tires?
Before driving a 1991 GMC Trucks C3500 on new tires, inspect the wheels for damage or rust, confirm the wheel size matches the tire being installed, and make sure valve stems, lug hardware, and wheel-mounting surfaces are in sound condition. Tire pressure should also be set correctly for the tire and the truck’s intended use.
A heavy-duty dually benefits from an extra check of rear dual spacing, even wear across the set, and any signs that suspension or alignment issues have been present. After the first few drives, look again for rubbing, unusual wear, or air loss so small installation or setup issues are caught before the truck is put into harder service.
How should 225/75R16 or 750-16 tires on a collector 1991 GMC Trucks C3500 be maintained?
Collector-truck tires should be inspected regularly even if the 1991 GMC Trucks C3500 is driven only occasionally. Check for cracking, bulges, cuts, tread wear, and slow air loss, and keep the tires properly inflated so the truck’s weight is not resting on underinflated casings between drives.
Storage conditions matter as much as mileage on a low-use truck. Keeping the C3500 away from prolonged sun, heat, moisture, and ozone sources helps preserve both radial and bias-ply tires, and moving the truck periodically can reduce flat-spotting concerns. Any tire with age-related deterioration should be evaluated before road use, regardless of remaining tread.
