The 1981 Ford Trucks F-100 sits in an interesting transition period, when full-size pickups still carried classic Ford truck proportions but increasingly used modern radial tire sizing and road manners. For many owners, that makes tire selection less about one universal answer and more about matching the truck’s exact GVWR and trim configuration. On this F-100, 15-inch wheel fitment appears across several primary sizes, including 195/75R15, 215/75R15, 235/75R15, and the older H78-15 bias-ply size. That opens the door to different sidewall presentations, truck-oriented tread choices, and even radial equivalents for H78-15. The right choice depends on whether the goal is everyday drivability, traditional truck character, or a more restoration-minded appearance.
Which Tire Size Is Right for The 1981 Ford Trucks F-100
The 1981 Ford Trucks F-100 uses four primary tire sizes, and the correct one depends on the truck’s exact sub-model and GVWR. All of these fitments use a 15-inch rim, but they are not interchangeable by assumption because the truck could be equipped with radial sizes from 195/75R15 through 235/75R15 or the older H78-15 bias-ply size. The first step is confirming the exact truck configuration, then deciding whether the priority is stock-style construction, sidewall appearance, or an appropriate radial alternative.
195/75R15 is a metric radial size in which 195 identifies nominal section width in millimeters, 75 is the aspect ratio, and 15 is the wheel diameter in inches. On the 1981 Ford Trucks F-100, this is a modern radial fitment that suits trucks using the narrower end of the 15-inch tire range. Available choices focus on traditional whitewall presentation, with Coker Classic and American Classic offerings in both narrow and wide whitewall styles. This size is worth considering when the truck’s specific configuration calls for it and the goal is a radial tire with a more vintage-looking sidewall treatment.
215/75R15 is a metric radial size that steps up in section width from 195-series fitment while keeping the same 15-inch rim diameter. For the 1981 Ford Trucks F-100, it represents one of the most broadly used radial fitments across multiple GVWR configurations. Choices in this size range from traditional whitewall radials in series such as Star Series, Silvertown Radial, American Classic Radial, Coker Classic Radial, and Tornel Classic to a BFGoodrich All-Terrain T/A KO2 truck tire. This size deserves a close look when the truck needs a balance of correct overall fitment, 15-inch compatibility, and broader product variety.
235/75R15 is a wider metric radial size, with 235 denoting nominal section width in millimeters, a 75-series profile, and a 15-inch wheel diameter. On the 1981 Ford Trucks F-100, this size appears on several higher-capacity configurations and carries the broadest mix of whitewall and truck-style radial options. Available products include narrow and wide whitewall designs from Coker Classic, American Classic, BFGoodrich, Maxxis, Tornel, and Travelstar, along with BFGoodrich All-Terrain T/A KO2 raised white letter styling. This is the size to evaluate when the truck’s setup calls for a fuller radial fitment and wheel-width compatibility needs to be checked carefully.
H78-15 is a vintage alphanumeric tire size, where the letter and number combination identifies a traditional sizing class and the final 15 denotes rim diameter. On the 1981 Ford Trucks F-100, this is a bias-ply fitment rather than a modern radial, making it the most traditional-looking option among the primary sizes used on this truck. Available choices include wide whitewall Coker Classic Bias Ply versions and the blackwall STA Traxion truck tire. This size matters most when a 4750-GVWR truck calls for the older bias-ply fitment or when traditional truck stance and appearance are part of the decision.
Tire fitment on the 1981 Ford Trucks F-100 varies by both trim and GVWR, so identifying the exact truck matters before choosing a size. Every covered version uses a 15-inch rim, but the usable tire size range changes across 4650, 4750, and 5000 GVWR configurations.
1
1981 Ford Trucks F-100 Custom (GVWR 4650)
This Custom 4650 configuration uses radial fitments rather than the H78-15 bias-ply option. Tire selection here centers on choosing among the three metric radial sizes already associated with the truck and then narrowing the decision by sidewall style, brand, and intended use.
This Custom 4750 configuration is one of the versions where both modern radial sizing and the H78-15 bias-ply fitment appear. That makes the decision more nuanced, since the truck may call for either a traditional bias-ply presentation or a radial setup that should be matched carefully to the wheel and overall vehicle configuration.
This Custom 5000 configuration stays within the larger radial portion of the F-100 fitment range. Tire choice here comes down to confirming whether the truck uses 215/75R15 or 235/75R15, then comparing radial options by sidewall treatment, load characteristics, and wheel-width suitability.
This Ranger 4650 configuration uses radial tire fitments across three metric sizes. The practical decision is not bias-ply versus radial, but which of the applicable radial sizes matches the truck and which available whitewall or truck-style option best suits how the pickup is being finished or driven.
This Ranger 4750 configuration includes both radial sizes and the H78-15 bias-ply fitment. Owners should first confirm the truck’s actual wheel and tire setup, then decide whether the priority is a traditional bias-ply look or one of the available radial alternatives in the corresponding 15-inch range.
This Ranger 5000 configuration uses two radial sizes and does not rely on the H78-15 bias-ply option. Selection is mainly about confirming the correct radial size for the truck and then choosing the sidewall style or tire series that matches either a stock-style appearance or more utility-focused use.
This Ranger Lariat 4650 configuration stays with radial fitments in the narrower-to-midrange metric sizes used on the F-100. Buyers can focus on the correct radial size first, then compare whitewall width, brand, and tire series to match the truck’s trim level and overall presentation.
This Ranger Lariat 4750 configuration is one of the trucks where H78-15 bias-ply fitment appears alongside radial size options. That makes construction choice especially important, since the truck may be heading toward a traditional truck look or a more modern radial driving setup.
This Ranger Lariat 5000 configuration uses the larger radial fitments offered for the 1981 F-100. The main task is confirming whether 215/75R15 or 235/75R15 belongs on the truck, then reviewing the available radial products for wheel-width compatibility and the preferred sidewall presentation.
This Ranger XLT 4650 configuration uses radial tire sizes across the smaller end of the F-100’s 15-inch fitment spectrum. Once the exact size is confirmed, the buyer can compare narrow or wide whitewall treatments and different radial series to match the truck’s trim and intended road use.
This Ranger XLT 4750 configuration includes radial sizes as well as the H78-15 bias-ply fitment. That means the truck may call for a more traditional alphanumeric tire or a radial alternative, so wheel setup and the desired finished look both deserve attention before choosing.
This Ranger XLT 5000 configuration remains within the larger radial fitment range for the 1981 F-100. Selection is straightforward once the correct size is pinned down, with the real comparison then shifting to tire series, sidewall style, and the truck’s expected mix of show, cruising, or utility use.
Bias-Ply to Radial Tire Conversion for the 1981 Ford Trucks F-100
H78-15 has four radial-equivalent paths to consider on the 1981 Ford Trucks F-100. The available alternatives are 215R15 as an 80-series metric radial, P225/75R15 as a 75-series P-metric radial, P235/70R15 as a lower-profile 70-series P-metric radial, and 760R15 as a bias-look radial equivalent. Together, these options span traditional metric radial sizing, later P-metric formats, and a radial designed to preserve a more vintage presentation. The suggested rim-width range is 6 to 8 inches, and final selection should still be checked against wheel compatibility, overall dimensions, and truck clearance.
Modern Radial Equivalents
215R15
Equivalent 80-series Metric Radial (H78-15)
P225/75R15
Equivalent P-metric 75-series Radial (H78-15)
P235/70R15
Equivalent P-metric 70-series Radial (H78-15)
760R15
Bias-look Radial Equivalent (H78-15)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (6-8 in) and load needs match your vehicle specifications.
Check fender clearance, steering clearance, and stance before installation.
Consider suspension condition and intended road use when choosing equivalents.
Important Fitment Notes
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 1981 Ford Trucks F-100 Tires for Sale
Available 15-inch tire choices for the 1981 Ford Trucks F-100 range from bias-ply H78-15 options to radial sizes in 195/75R15, 215/75R15, and 235/75R15. Brands include Coker Classic, American Classic, BFGoodrich, Maxxis, Tornel, Travelstar, and STA, with blackwall, narrow whitewall, wide whitewall, RBL, and RWL presentations across several tire series.
Showing 6 of 27
Radial Tires
Coker Classic Star Series | 2.25 Inch Whitewall | 195/75R15
These 1981 Ford Trucks F-100 tire FAQs focus on exact size fitment by GVWR and sub-model, 15-inch rim compatibility, bias-ply versus radial choices, H78-15 radial equivalents, appearance decisions, and the checks worth making before regular road use.
Tire Size & Fitment
What tire size fits a 1981 Ford Trucks F-100?
The 1981 Ford Trucks F-100 uses four primary tire sizes: 195/75R15, 215/75R15, 235/75R15, and H78-15. The three metric sizes are radial fitments, while H78-15 is a bias-ply fitment. Which one belongs on a given truck depends on the exact trim and GVWR configuration rather than the model name alone.
That means the first step is identifying the truck as a Custom, Ranger, Ranger Lariat, or Ranger XLT and confirming whether it is a 4650, 4750, or 5000 GVWR version. Since all of these sizes use a 15-inch rim, wheel diameter alone does not settle the question. The actual size on the truck, the wheel width, and any modifications should all be checked before choosing a replacement.
What size rim does a 1981 Ford Trucks F-100 use?
The tire fitments used on the 1981 Ford Trucks F-100 in this range all share a 15-inch rim diameter. That includes the radial sizes 195/75R15, 215/75R15, and 235/75R15, along with the H78-15 bias-ply size. Even though the tire sizes vary, the wheel diameter remains consistent.
A shared 15-inch diameter does not mean every size should be treated as interchangeable. Tire width, profile, and recommended wheel-width range still matter, especially when moving between 195-, 215-, and 235-series radials or evaluating an H78-15 alternative. Measuring the wheel and confirming the truck’s existing setup is the practical next step, particularly if aftermarket wheels or older replacement tires are already on the pickup.
Why does the 1981 Ford Trucks F-100 have more than one tire size?
The 1981 Ford Trucks F-100 covers several trim and GVWR combinations, so tire fitment is not limited to one size across the board. Trucks in the 4650 range can use 195/75R15, 215/75R15, or 235/75R15, while 5000-GVWR versions use 215/75R15 or 235/75R15. Some 4750-GVWR trucks also use H78-15 bias-ply tires.
That spread reflects the fact that one model name can still cover different equipment and load-oriented configurations. A buyer should match the replacement tire to the truck’s exact sub-model and present wheel setup, not just to the year and body name. Looking at the tire sidewall already on the truck and confirming wheel width helps avoid ordering a size that belongs to a different F-100 configuration.
Bias-Ply & Radial Options
Is H78-15 a bias-ply or radial tire for the 1981 Ford Trucks F-100?
H78-15 is a bias-ply tire size on the 1981 Ford Trucks F-100. It uses the older alphanumeric sizing system rather than a modern metric radial format, and it appears on certain 4750-GVWR truck configurations. Among the primary F-100 fitments here, it is the traditional-construction option alongside three radial sizes.
That matters because a bias-ply tire changes both the appearance and the selection process. H78-15 products include wide whitewall and blackwall choices, and the truck’s wheel width should still be checked before staying with that size or evaluating a radial alternative. Owners aiming for a more traditional truck presentation often stay with bias-ply, while others compare the available radial-equivalent sizes carefully before making a change.
What radial tire sizes are equivalent to H78-15?
Radial equivalents for H78-15 include 215R15 as an 80-series metric radial, P225/75R15 as a 75-series P-metric radial, P235/70R15 as a 70-series P-metric radial, and 760R15 as a bias-look radial equivalent. These options cover several sizing conventions, from a more traditional metric radial format to a radial that keeps a more vintage visual character.
Each of those alternatives still needs to be judged against the truck’s wheel and physical space around the tire. A 6- to 8-inch rim-width range is associated with the H78-15 equivalency set, which makes wheel measurement especially useful before choosing among them. The right comparison is not just radial versus bias-ply, but also profile, wheel compatibility, and how the finished truck should look.
What should I check before converting my 1981 Ford Trucks F-100 from bias-ply to radial tires?
Start by confirming that the truck actually uses the H78-15 bias-ply fitment and then compare only the radial equivalents tied to that size: 215R15, P225/75R15, P235/70R15, and 760R15. Rim diameter and wheel width need to be verified first, since the associated equivalency range calls for a 6- to 8-inch wheel width.
The next checks are practical rather than theoretical. Look at the truck’s existing wheel condition, steering clearance, fender clearance, suspension height, and whether any aftermarket wheels or chassis changes have altered the original setup. A radial equivalent can be a useful alternative, but the truck should be measured as it sits so the chosen tire matches the real wheel and body combination.
Choosing the Right Tire
What should I consider when choosing a tire for a 1981 Ford Trucks F-100?
The first consideration is the truck’s exact fitment: 195/75R15, 215/75R15, 235/75R15, or H78-15, depending on sub-model and GVWR. Construction matters too, because the F-100 range here includes both radial and bias-ply choices. Once the correct size is confirmed, the remaining decision usually comes down to sidewall appearance, tire series, and how the truck will actually be used.
A show-oriented pickup may lean toward a traditional whitewall presentation, while a more utility-minded truck might point toward a blackwall or truck-style radial. Wheel-width compatibility is also important, especially across the wider 235-series sizes and the H78-15 fitment. Matching the tire to the truck’s true setup and intended personality leads to a better result than choosing by appearance alone.
What sidewall styles are available for 1981 Ford Trucks F-100 tires?
Sidewall choices for the 1981 Ford Trucks F-100 include blackwall, narrow whitewall, wide whitewall, RBL, and RWL, depending on size and tire series. The radial sizes are heavily represented by narrow and wide whitewall options, while the H78-15 bias-ply group includes wide whitewall and blackwall offerings. Truck-style BFGoodrich options also bring lettered sidewall treatments into the mix.
That variety lets the tire shape the truck’s finished look as much as its mechanical fitment. A whitewall can give an F-100 a more restoration-oriented or custom presentation, while blackwall and lettered sidewalls push the truck toward a more work-truck or later-period feel. Once the correct size is settled, sidewall style becomes one of the clearest ways to tailor the pickup’s visual character.
What brands offer tires for the 1981 Ford Trucks F-100?
Tires for the 1981 Ford Trucks F-100 are available from Coker Classic, American Classic, BFGoodrich, Maxxis, Tornel, Travelstar, and STA. Brand availability depends on the exact size, with the broadest assortment appearing in 215/75R15 and 235/75R15. H78-15 is more specialized, with bias-ply choices from Coker Classic and STA.
Brand comparison on this truck is less about ranking names and more about understanding what each line actually offers in the right size. Some focus on whitewall radial presentation, some bring truck-oriented styling, and some stay close to older bias-ply character. Once the correct size is locked in, compare construction, sidewall treatment, series, and wheel-width suitability to narrow the field intelligently.
Restoration & Appearance
Which tire should I choose for a period-style 1981 Ford Trucks F-100?
A period-style 1981 Ford Trucks F-100 usually starts with using the exact tire size associated with the truck’s sub-model and GVWR, then choosing a construction and sidewall treatment that supports the desired look. For some 4750-GVWR trucks, that may mean H78-15 bias-ply. For radial-fitment trucks, narrow or wide whitewall metric radials can still deliver a very traditional presentation.
The right answer depends on whether the truck is being preserved as a practical late-classic pickup, finished as a stock-style restoration, or personalized within the era. Tire appearance has a major effect on stance and visual balance, but exact originality should be checked against truck-specific historical references when that level of detail matters. Size fitment still comes first, because appearance only works when the tire belongs on the wheel and vehicle.
How does tire construction affect the appearance of a restored 1981 Ford Trucks F-100?
Tire construction changes the visual impression of a restored 1981 Ford Trucks F-100 more than many buyers expect. An H78-15 bias-ply setup gives the truck an older alphanumeric look and a distinctly traditional character, while metric radials such as 195/75R15, 215/75R15, and 235/75R15 place the truck more clearly in its early-1980s transition era.
Sidewall treatment then sharpens that effect. Wide whitewalls can push the truck toward a custom or restoration-minded presentation, while narrow whitewalls, blackwalls, or lettered sidewalls create very different personalities. Construction should be chosen as part of the truck’s whole visual story, but only after confirming which sizes are actually appropriate for that specific F-100 configuration.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1981 Ford Trucks F-100?
Yes, modifications can affect tire fitment on a 1981 Ford Trucks F-100 even when the nominal tire size seems correct. Aftermarket wheels, altered wheel width, suspension changes, ride-height changes, or body modifications can all change how a 15-inch tire sits and clears. That is especially important when comparing different widths such as 195/75R15, 215/75R15, and 235/75R15.
A truck that has been lowered, lifted, or fitted with replacement wheels should be measured as it sits today, not assumed to match stock geometry. Steering travel and fender clearance deserve extra attention before moving to a wider or differently profiled tire. Even an H78-15 radial-equivalent conversion should be treated as a fitment exercise rather than a simple size-name substitution.
What should I inspect before driving a 1981 Ford Trucks F-100 on new tires?
Before putting a 1981 Ford Trucks F-100 back into regular road use on new tires, inspect the wheels, valve stems, and lug hardware, then confirm that the tire size and construction match the truck’s actual configuration. Air pressure should be set correctly for the chosen tires, and each tire should be checked for proper seating and any early signs of air loss after installation.
The truck itself also deserves attention, especially if it has been sitting. Look over steering components, suspension wear, brake condition, and clearance around the full turning range so the new tires are not blamed for unrelated mechanical issues. A short local drive followed by a second inspection is a smart way to catch rubbing, vibration, or pressure loss before longer trips.
How should tires on a collector 1981 Ford Trucks F-100 be maintained?
Tires on a collector 1981 Ford Trucks F-100 should be maintained with regular pressure checks, visual inspections, and careful storage habits. Even low-mileage trucks need periodic attention, because age, sun exposure, and long stationary periods can affect radial and bias-ply tires alike. The sidewalls and tread should be watched for cracking, cuts, bulges, and uneven wear.
Collector trucks benefit from being stored away from prolonged heat, direct sunlight, moisture, and ozone sources such as electric motors or welders. It also helps to move the truck occasionally so the tires are not carrying the same load point for extended periods. Before each driving season or longer outing, inspect both tire condition and air retention rather than assuming a lightly used set is automatically road-ready.
