The 1991 Ford Trucks Bronco sits in the final years of the square-shouldered full-size Bronco era, a period when these SUVs balanced everyday utility with genuine off-road credibility. Buyers today often approach one with two very different goals: preserving a clean early-1990s look or keeping a Bronco ready for more rugged truck use. This Bronco uses radial tires in two 15-inch fitments, 235/75R15 and 31X10.50R15, so the first step is confirming which setup is on the vehicle. Available choices range from raised white letter all-terrain styling to narrow and wide whitewall radials, making tire selection as much about intended use and appearance as basic size.
Which Tire Size Is Right for The 1991 Ford Trucks Bronco
The 1991 Ford Trucks Bronco uses two primary tire sizes, and both are radial fitments built for 15-inch wheels. Because every listed sub-model can use either 235/75R15 or 31X10.50R15, the real decision is confirming which wheel-and-tire package is already on the Bronco before choosing between a more standard metric radial setup and a taller flotation-style light truck tire.
The 235/75R15 size uses modern metric sizing: 235 is the section width in millimeters, 75 is the aspect ratio, R identifies radial construction, and 15 is the wheel diameter in inches. On a 1991 Ford Trucks Bronco, this size suits the stock-style 15-inch radial fitment and opens up the broadest range of choices. Available tires include BFGoodrich, American Classic, Maxxis, Coker Classic, Tornel, and Travelstar options with raised white letter, narrow whitewall, and wide whitewall sidewall treatments. This size makes sense for owners focused on everyday road use, restoration-oriented appearance, or simply having the widest selection within the Bronco's standard fitment range.
The 31X10.50R15 size follows flotation-style light truck sizing, where 31 refers to approximate overall tire diameter in inches, 10.50 refers to section width, R marks radial construction, and 15 is the rim diameter. For the 1991 Ford Trucks Bronco, it represents the larger 15-inch radial option and gives the vehicle a more truck-oriented stance than the metric size. The available product in this fitment is a BFGoodrich All-Terrain T/A KO2 with raised white lettering. This size deserves a careful wheel-width and clearance check, especially on Broncos that may have changed wheels, suspension height, or steering components over time.
Fitment is straightforward across the covered 1991 Ford Trucks Bronco sub-models because Custom, Eddie Bauer, XL, and XLT can all use the same two radial tire sizes. The key is not trim level alone, but confirming which 15-inch wheel-and-tire setup is actually on the Bronco before choosing a replacement.
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1991 Ford Trucks Bronco Custom
The 1991 Ford Trucks Bronco Custom can use either of the two primary 15-inch radial tire sizes offered for this model year. That means tire selection starts with verifying whether the Bronco is currently on the 235/75R15 metric setup or the larger 31X10.50R15 flotation-style truck tire.
The 1991 Ford Trucks Bronco Eddie Bauer shares the same two radial fitment paths as the other covered sub-models. Once the current wheel and tire package is confirmed, the choice usually comes down to traditional road-oriented appearance in 235/75R15 or a more truck-focused all-terrain presentation in 31X10.50R15.
The 1991 Ford Trucks Bronco XL can be fitted with either of the Bronco's two 15-inch radial tire sizes. That makes wheel confirmation especially important, since selecting the correct replacement depends on whether the vehicle uses the metric radial size or the larger flotation-style light truck size.
The 1991 Ford Trucks Bronco XLT uses the same pair of 15-inch radial tire sizes found across the rest of the line. For replacement planning, the practical step is checking the Bronco's existing wheel-and-tire combination so sidewall style, tire series, and intended use can be matched to the right size.
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 Bronco Tires for Sale
Available 1991 Ford Trucks Bronco tires span both fitments, with the broadest selection in 235/75R15. Choices include BFGoodrich, American Classic, Maxxis, Coker Classic, Tornel, and Travelstar products, with raised white letter, narrow whitewall, and wide whitewall sidewalls across several radial series.
These FAQs focus on the two 15-inch tire sizes used on the 1991 Ford Trucks Bronco, along with wheel confirmation, sidewall and brand choices, and the basic fitment and maintenance checks worth making before regular road use.
Tire Size & Fitment
What tire size fits a 1991 Ford Trucks Bronco?
A 1991 Ford Trucks Bronco uses one of two primary radial tire sizes: 235/75R15 or 31X10.50R15. Both sizes are built for 15-inch wheels, and all covered Bronco sub-models can use either size depending on the wheel-and-tire package on the vehicle.
The important step is confirming what is actually mounted on the Bronco before ordering replacements. A metric 235/75R15 setup and a 31X10.50R15 flotation-style truck setup differ noticeably in overall dimensions and wheel-width requirements, so trim name alone is not enough if the vehicle has changed wheels or has been modified over the years.
What size rim does a 1991 Ford Trucks Bronco use?
The 1991 Ford Trucks Bronco uses a 15-inch rim with both of its primary tire sizes. The two tire options, 235/75R15 and 31X10.50R15, are both 15-inch radial fitments, so wheel diameter remains consistent even though the tire sizes themselves are different.
Rim diameter still needs to be checked along with wheel width before choosing a replacement tire. The available 235/75R15 products cover several rim-width ranges, while the 31X10.50R15 all-terrain option calls for a wider wheel range, so measuring the wheel already on the Bronco is the safest way to narrow the right tire choices.
Do all 1991 Ford Trucks Bronco sub-models use the same tire size?
Custom, Eddie Bauer, XL, and XLT Broncos all share the same two primary radial tire sizes: 235/75R15 and 31X10.50R15. In other words, the fitment pattern stays consistent across the covered sub-models rather than assigning one unique tire size to each trim.
That does not mean every Bronco left with the same wheel-and-tire combination now. The practical issue is determining which of the two 15-inch sizes is on the vehicle today, especially if it has aftermarket wheels, suspension changes, or a replacement tire package installed sometime during its life.
Choosing the Right Tire
What should I consider when choosing a tire for a 1991 Ford Trucks Bronco?
Start by confirming whether the Bronco uses 235/75R15 or 31X10.50R15, since both are correct primary radial sizes for this model year. From there, the choice shifts to intended use, sidewall appearance, brand, tire series, and the wheel width required by the specific tire being considered.
A Bronco driven mostly on pavement may lead toward the broader 235/75R15 selection, where whitewall and traditional-looking radials are available. A Bronco kept for truck duty or a tougher visual stance may point toward the 31X10.50R15 all-terrain option, but that larger size deserves extra attention to wheel width and surrounding clearance.
What sidewall styles are available for 1991 Ford Trucks Bronco tires?
The 1991 Ford Trucks Bronco has several sidewall styles available, depending on tire size. In 235/75R15, choices include raised white letter, narrow whitewall, and wide whitewall designs, while 31X10.50R15 is available here as a raised white letter all-terrain tire.
Sidewall style affects the Bronco's overall presentation more than many buyers expect. A raised white letter tire leans into a truck and off-road look, while narrow or wide whitewalls can support a more customized, restored, or period-flavored appearance, especially on Broncos built to reflect early-1990s personal-use SUV style rather than trail emphasis.
What brands offer tires for the 1991 Ford Trucks Bronco?
Tires for the 1991 Ford Trucks Bronco are available from BFGoodrich, American Classic, Maxxis, Coker Classic, Tornel, and Travelstar. Most of that variety appears in 235/75R15, while the 31X10.50R15 fitment shown here is offered as a BFGoodrich all-terrain radial.
Brand choice should be considered alongside tire series, sidewall style, and wheel-width compatibility rather than in isolation. Some options are geared toward traditional whitewall presentation, while others support a more truck-oriented look, so the best comparison starts with the right size and then narrows by the visual character and specifications that suit the Bronco.
Restoration & Appearance
Which tire should I choose for a period-style 1991 Ford Trucks Bronco?
For a period-style 1991 Ford Trucks Bronco, the most natural starting point is the tire size already on the vehicle, then the sidewall treatment that matches the look being pursued. In 235/75R15, available choices include narrow whitewall, wide whitewall, and raised white letter radials, which creates very different visual results.
A whitewall radial can suit a restoration-oriented or customized Bronco with a more polished street presentation, while raised white lettering feels more truck-like and late-1980s to early-1990s in character. When exact originality matters, compare the tire choice against vehicle-specific historical references and photos so appearance decisions support the build rather than fight it.
How does tire construction affect the appearance of a restored 1991 Ford Trucks Bronco?
Tire construction is straightforward on the 1991 Ford Trucks Bronco because both primary fitments are radial. That means the visual differences come less from bias-ply versus radial construction and more from overall size, sidewall treatment, and whether the Bronco is on the standard metric tire or the taller flotation-style truck tire.
A 235/75R15 radial with a whitewall can give the vehicle a cleaner restored or custom street look, while a 31X10.50R15 raised white letter tire adds a more rugged stance. Since both sizes use 15-inch wheels, the appearance change is driven by tire proportions and sidewall style rather than a change in basic construction type.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 Ford Trucks Bronco?
Yes. Even though the 1991 Ford Trucks Bronco uses 15-inch tires in either 235/75R15 or 31X10.50R15, aftermarket wheels, altered wheel width, suspension changes, or body modifications can affect what works on a particular truck. That is especially important with the larger 31X10.50R15 size.
A Bronco with non-original wheels may need closer attention to wheel width and surrounding clearance before a replacement tire is chosen. Steering travel, fender space, and suspension condition all matter once a truck has been changed from its earlier setup, so a quick visual check is not always enough to confirm a safe fit.
What should I inspect before driving a 1991 Ford Trucks Bronco on new tires?
Before driving a 1991 Ford Trucks Bronco on new tires, inspect the wheels for correct diameter and width, make sure the lug hardware and wheel seating surfaces are in good condition, and verify that the tires are inflated properly for the application. It also helps to look over suspension and steering components for obvious wear.
A short initial road check can reveal rubbing, pull, vibration, or contact issues that are easier to address early. Collector and hobby-use Broncos also deserve a close look at wheel wells, brake hoses, and any old suspension bushings, since a fresh tire can expose clearance or drivability problems that were less noticeable on worn rubber.
How should tires on a collector 1991 Ford Trucks Bronco be maintained?
Tires on a collector 1991 Ford Trucks Bronco should be checked regularly for air loss, uneven wear, cracking, cuts, bulges, and any signs of age-related deterioration. Proper inflation matters even when the truck is driven only occasionally, because underinflation and long stationary periods can both shorten tire life.
Storage conditions make a real difference on a low-use Bronco. Keeping the vehicle away from prolonged sunlight, excess moisture, and ozone sources can help preserve the tires, and moving the truck periodically can reduce flat spotting. Before any longer drive, inspect tread and sidewalls closely rather than assuming a lightly used tire is road-ready.
