The 1991 Ford Trucks F-250 Custom sits in the era when Ford heavy-duty pickups were expected to handle real work, from towing and hauling to four-wheel-drive use on rougher ground. For buyers restoring one, maintaining one, or simply putting it back into dependable road service, tire choice is tied closely to the truck’s exact configuration. This F-250 Custom uses 16-inch radial fitments, with 215/85R16, 235/85R16, and 7.50R16 all appearing across the range. That makes the real decision less about old bias-ply conversion questions and more about confirming the correct sub-model, GVWR, and wheel setup before choosing the tire style that suits the truck’s intended use.
Which Tire Size Is Right for The 1991 Ford Trucks F-250 Custom
Three primary tire sizes apply to the 1991 Ford Trucks F-250 Custom, and the right one depends on the truck’s exact sub-model and GVWR. All three sizes are radial and use a 16-inch rim, so the first step is confirming whether the truck is a 4x2, 4x4, heavy-duty front end, or Super Cab configuration. Once that is settled, the selection focus shifts to the tire’s sizing format, stance, and intended road or light-truck use.
Fit(s): 4x2 (GVWR 6600), 4x4 (GVWR 6800), and 4x4 (H.D. Front End)(GVWR 6800)
Construction: Radial|Rim: 16 in
215/85R16 is a metric radial size in which 215 is the section width in millimeters, 85 is the aspect ratio, R identifies radial construction, and 16 is the rim diameter in inches. On this F-250 Custom, it is one of the radial fitments used on certain 4x2 and 4x4 configurations. Its sizing format is familiar to modern truck owners and makes comparison straightforward when checking wheel compatibility. This size is worth evaluating when the truck’s exact sub-model calls for it and the goal is to stay with the proper 16-inch radial fitment.
Fit(s): 4x2 (GVWR 6600), 4x2 (GVWR 7700), 4x2 (GVWR 8600), 4x4 (GVWR 6800), 4x4 (GVWR 8600), 4x4 (H.D. Front End)(GVWR 6800), 4x4 (H.D. Front End)(GVWR 8600), and 4x4 Super Cab
Construction: Radial|Rim: 16 in
235/85R16 is a metric radial size, with 235 marking section width in millimeters, 85 indicating the aspect ratio, and 16 showing the wheel diameter. It appears across the widest range of 1991 Ford Trucks F-250 Custom configurations, including several higher-GVWR versions and the Super Cab. Available product choice in this size includes a BFGoodrich All-Terrain T/A KO2 with raised white letter sidewalls. This size deserves close attention when matching a truck used for work, road driving, or a more aggressive light-truck appearance on the correct 16-inch wheel.
Fit(s): 4x2 (GVWR 6600), 4x4 (GVWR 6800), and 4x4 (H.D. Front End)(GVWR 6800)
Construction: Radial|Rim: 16 in
7.50R16 uses an older numeric radial format, with 7.50 indicating nominal section width in inches, R showing radial construction, and 16 identifying the rim diameter. On the 1991 Ford Trucks F-250 Custom, this size appears on certain 4x2 and 4x4 versions alongside modern metric alternatives. Its traditional sizing convention gives it a different feel from later metric truck sizes, which matters when matching an older light-truck presentation. This size should be chosen only after confirming the truck’s exact configuration and wheel setup, especially on trucks that may have been updated over time.
Sub-model fitment matters on the 1991 Ford Trucks F-250 Custom because tire size changes across drivetrain, GVWR, and body configuration. Some versions accept more than one 16-inch radial size, while others narrow the choice to 235/85R16, so identifying the exact truck comes first.
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1991 Ford Trucks F-250 Custom 4x2 (GVWR 6600)
The 4x2 with 6,600-pound GVWR uses one of three 16-inch radial sizes: 215/85R16, 235/85R16, or 7.50R16. That gives this configuration more than one sizing path, so wheel dimensions and the truck’s current setup should be checked before settling on a replacement.
The 4x2 with 7,700-pound GVWR uses 235/85R16 radial tires. Tire selection here is more straightforward, with the focus shifting from fitment uncertainty to choosing the right product characteristics for the truck’s intended work or road use.
The 4x2 with 8,600-pound GVWR also uses 235/85R16 radial tires. That simplifies the fitment decision, but it still makes sense to confirm the existing wheel width and overall truck setup before choosing among available tires in that size.
The 4x4 with 6,800-pound GVWR can use 215/85R16, 235/85R16, or 7.50R16, all in radial construction on 16-inch rims. Because several sizes are possible, this is a configuration where actual wheel dimensions and any prior changes to the truck deserve a careful look.
The 4x4 with 8,600-pound GVWR uses 235/85R16 radial tires. That single fitment narrows the search quickly, leaving the main decisions centered on tire type, sidewall appearance, and compatibility with the truck’s wheels and intended use.
1991 Ford Trucks F-250 Custom 4x4 (H.D. Front End)(GVWR 6800)
The heavy-duty front-end 4x4 with 6,800-pound GVWR uses the same three 16-inch radial sizes found on some other F-250 Custom configurations: 215/85R16, 235/85R16, and 7.50R16. With multiple acceptable sizes in play, matching the tire to the actual wheel and truck configuration is especially important.
1991 Ford Trucks F-250 Custom 4x4 (H.D. Front End)(GVWR 8600)
The heavy-duty front-end 4x4 with 8,600-pound GVWR uses 235/85R16 radial tires. This setup keeps the size decision simple, so the next step is choosing a tire that suits the truck’s appearance, load expectations, and day-to-day driving conditions.
The 4x4 Super Cab uses 235/85R16 radial tires. Since this configuration points to one primary size, the buyer can concentrate on selecting the right tire style and checking wheel compatibility rather than sorting through multiple fitment possibilities.
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 Ford Trucks F-250 Custom Tires for Sale
Available product choice for the 1991 Ford Trucks F-250 Custom centers on 235/85R16, with a BFGoodrich All-Terrain T/A KO2 option in radial construction. It combines a 16-inch fitment, raised white letter sidewalls, and a 6.0- to 7.5-inch rim-width range, making specification comparison especially important.
Owners of a 1991 Ford Trucks F-250 Custom usually need to sort out exact tire size by sub-model, understand older and newer radial sizing formats, and confirm wheel fitment before road use. The questions below focus on those practical decisions.
Tire Size & Fitment
What tire size fits a 1991 Ford Trucks F-250 Custom?
The 1991 Ford Trucks F-250 Custom uses three primary radial tire sizes across its covered configurations: 215/85R16, 235/85R16, and 7.50R16. All of them are built for 16-inch rims, but they do not apply uniformly across every version of the truck.
The right choice depends on the exact sub-model, including whether the truck is a 4x2, 4x4, heavy-duty front-end version, Super Cab, or a particular GVWR rating. On an older pickup, it is also smart to verify the actual wheel and tire setup already on the truck, since replacement wheels or prior fitment changes are common.
What size rim does a 1991 Ford Trucks F-250 Custom use?
The tire fitments used on the 1991 Ford Trucks F-250 Custom all share a 16-inch rim diameter. That includes 215/85R16, 235/85R16, and 7.50R16, so the key wheel-diameter question is consistent even though the tire sizes vary by configuration.
Rim diameter is only part of the fitment picture on a truck like this. Wheel width still matters, especially when comparing available products such as the 235/85R16 BFGoodrich option, and any truck with aftermarket wheels should be measured carefully before choosing a replacement tire.
Why does the 1991 Ford Trucks F-250 Custom have more than one tire size?
The 1991 Ford Trucks F-250 Custom has more than one tire size because fitment changes with sub-model and GVWR. Some 4x2 and 4x4 versions can use 215/85R16, 235/85R16, or 7.50R16, while several higher-GVWR versions and the 4x4 Super Cab use 235/85R16 alone.
That means tire selection starts with identifying the truck correctly rather than assuming every F-250 Custom uses the same size. A buyer should confirm the drivetrain, GVWR, body configuration, and existing wheel setup before moving on to product style, sidewall appearance, or tread character.
Choosing the Right Tire
What should I consider when choosing a 235/85R16 tire for a 1991 Ford Trucks F-250 Custom?
Start with the basics: confirm that 235/85R16 is the correct size for the truck’s exact sub-model, then compare the tire’s construction, load rating, rim-width requirement, and intended use. For this F-250 Custom, the available 235/85R16 product uses radial construction and carries a max load capacity of 3,042 lbs at 80 psi.
After fitment is confirmed, the next decision is how the truck will be driven and how the tire should look. An all-terrain tread and raised white letter sidewall create a different presentation than a plain highway-style truck tire, so appearance and use should be weighed together.
What sidewall styles are available for 1991 Ford Trucks F-250 Custom tires?
The available product choice for this 1991 Ford Trucks F-250 Custom includes an RWL sidewall, which means raised white letters. That style appears on the BFGoodrich 235/85R16 option and gives the truck a more assertive light-truck look than a plain black sidewall.
Sidewall style should be chosen with the truck’s overall character in mind. A work-oriented pickup, a lightly restored driver, and a more off-road-inspired build can all call for different visual treatments, so it helps to match the sidewall appearance to the wheel style and intended use.
What brands offer tires for the 1991 Ford Trucks F-250 Custom?
BFGoodrich is represented among the available tire options for the 1991 Ford Trucks F-250 Custom, specifically in 235/85R16. That product belongs to the All-Terrain T/A KO2 line and is built as a radial light-truck tire for a 16-inch rim.
Brand alone should not make the decision on an older F-250. The better approach is to confirm the correct size first, then compare sidewall style, load capacity, rim-width suitability, tread character, and how closely the tire matches the truck’s intended driving and visual direction.
Restoration & Appearance
Which tire should I choose for a period-style 1991 Ford Trucks F-250 Custom?
A period-style choice for a 1991 Ford Trucks F-250 Custom starts with using the tire size that matches the truck’s exact configuration: 215/85R16, 235/85R16, or 7.50R16. The older 7.50R16 numeric radial format can also appeal to buyers who want a more traditional light-truck sizing presentation.
Appearance should be balanced with how the truck will actually be used. A restoration-oriented driver may lean toward a more traditional-looking tire, while a truck expected to cover regular road miles may place more weight on tread style, wheel compatibility, and practical road manners.
How does tire construction affect the appearance of a restored 1991 Ford Trucks F-250 Custom?
On this truck, the primary fitments are all radial, so the visual difference comes more from sizing format and sidewall treatment than from choosing between bias-ply and radial construction. A 7.50R16 radial presents differently from a modern metric size, and raised white letters create a more aggressive look than a plain sidewall.
That matters on a restored F-250 because tires influence stance and character as much as wheels do. Buyers pursuing a historically appropriate appearance should compare the truck’s build style, surviving reference material, and wheel setup before settling on a tire that looks right for the project.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 Ford Trucks F-250 Custom?
Yes, modifications can affect tire fitment on a 1991 Ford Trucks F-250 Custom even when the nominal tire size is correct. Aftermarket wheels, changed wheel width, suspension lifts, front-end changes, or body modifications can all alter clearance and how a 16-inch truck tire sits on the vehicle.
That matters most on configurations that can use more than one size, such as trucks fitted with 215/85R16, 235/85R16, or 7.50R16. A modified truck should be checked at the wheel opening and steering range before replacement tires are chosen, especially if the current setup differs from stock.
What should I inspect before driving a 1991 Ford Trucks F-250 Custom on new tires?
Before putting a 1991 Ford Trucks F-250 Custom back on the road with new tires, inspect the wheels for damage, confirm the wheel diameter and width, and make sure the tires are inflated appropriately for the application. It also helps to check lug hardware, valve stems, and overall wheel condition.
A truck that has been parked or lightly used deserves a broader inspection as well. Steering components, suspension wear, brake condition, alignment, and visible clearance at the front suspension and fenders should all be reviewed so the new tires are not being asked to compensate for other problems.
How should tires on a collector 1991 Ford Trucks F-250 Custom be maintained?
Tires on a collector 1991 Ford Trucks F-250 Custom should be checked regularly for air loss, tread wear, sidewall cracking, bulges, and cuts, even if the truck is driven only occasionally. Storage conditions matter too, since long periods of inactivity can age tires differently than steady use.
Keeping the truck away from prolonged sun, moisture, and ozone sources helps preserve tire condition over time. It is also wise to inspect tires before every longer drive, because an older pickup can spend months parked and still look fine at a glance while developing age-related issues.
