The 1991 Isuzu Trucks Rodeo arrived in the early wave of compact sport utility vehicles that blended pickup-based toughness with everyday family use. For owners today, that means tire selection often comes down to whether the truck is a 4x2 street-oriented setup or a 4x4 with a more off-road-ready stance. This exact Rodeo uses radial tires, with 225/75R15 on 4x2 models and 31X10.50R15 on 4x4 models, both on 15-inch rims. Available choices range from whitewall metric radials to an all-terrain raised white letter option. The right direction depends on the truck's drivetrain, wheel setup, intended use, and the appearance you want to maintain.
Which Tire Size Is Right for The 1991 Isuzu Trucks Rodeo
The 1991 Isuzu Trucks Rodeo uses two primary tire sizes, and the correct one depends on the specific sub-model rather than a change in rim diameter. Both sizes are radial and fit 15-inch wheels, but 4x2 models use 225/75R15 while 4x4 models use 31X10.50R15. The first step is confirming whether your Rodeo is a 4x2 or 4x4, then comparing the available tire style, sidewall treatment, and intended use within that size.
Fit(s): LS 4x2, LS 4x2 w/aluminum wheels, S 4x2, S 4x2 w/aluminum wheels, XS 4x2, and XS 4x2 w/aluminum wheels
Construction: Radial|Rim: 15 in
225/75R15 is a metric radial size in which 225 refers to nominal section width in millimeters, 75 is the aspect ratio, R identifies radial construction, and 15 is the rim diameter in inches. On the 1991 Isuzu Trucks Rodeo, this size suits the 4x2 versions and supports a more road-oriented fitment than the larger 4x4 tire size. Available choices include BFGoodrich, Coker Classic, American Classic, Maxxis, and Travelstar, with narrow and wide whitewall treatments across several radial series. It is the size to evaluate when preserving stock-style 4x2 proportions and matching the tire to the wheel width already on the truck.
Fit(s): LS 4x4, LS 4x4 w/aluminum wheels, S 4x4, S 4x4 w/aluminum wheels, XS 4x4, and XS 4x4 w/aluminum wheels
Construction: Radial|Rim: 15 in
31X10.50R15 uses a light truck flotation-style format, where 31 indicates the approximate overall tire diameter in inches, 10.50 is the nominal section width in inches, R identifies radial construction, and 15 is the rim diameter. On the 1991 Isuzu Trucks Rodeo, this size is used on 4x4 sub-models and reflects the taller, wider tire setup associated with four-wheel-drive use. The available product centers on BFGoodrich's All-Terrain T/A KO2 with raised white letter styling. This is the size to confirm when the truck has a 4x4 configuration and needs a tire with the proper overall stance for that application.
Sub-model fitment on the 1991 Isuzu Trucks Rodeo is split cleanly between 4x2 and 4x4 versions. Trim level and aluminum-wheel notation do not change the tire size, so the key step is confirming the drivetrain before choosing a tire.
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1991 Isuzu Trucks Rodeo LS 4x2
The 1991 Isuzu Trucks Rodeo LS 4x2 uses the road-oriented 225/75R15 radial size on a 15-inch wheel. That makes tire selection more about sidewall style, brand, and rim-width compatibility than choosing between multiple primary fitments.
The 1991 Isuzu Trucks Rodeo LS 4x2 w/aluminum wheels also uses 225/75R15 radials. Aluminum wheels do not change the primary tire size here, but wheel width should still be checked before selecting among the available whitewall radial options.
The 1991 Isuzu Trucks Rodeo LS 4x4 uses the larger 31X10.50R15 radial size. That points the selection process toward confirming the 4x4 wheel setup and deciding whether an all-terrain tire presentation matches how the truck will be driven and shown.
The 1991 Isuzu Trucks Rodeo LS 4x4 w/aluminum wheels keeps the same 31X10.50R15 radial fitment as the standard LS 4x4. Tire choice still depends more on wheel-width suitability and intended use than on the aluminum-wheel designation itself.
The 1991 Isuzu Trucks Rodeo S 4x2 uses 225/75R15 radials. For this sub-model, the practical choice is whether to keep a simple road-going look or lean toward a more restoration-oriented whitewall presentation within the same size.
The 1991 Isuzu Trucks Rodeo S 4x2 w/aluminum wheels remains on 225/75R15 radial tires. Buyers can focus on sidewall treatment and brand selection, while confirming that the actual wheel width matches the tire's approved range.
The 1991 Isuzu Trucks Rodeo S 4x4 uses 31X10.50R15 radials rather than the smaller 4x2 size. That makes drivetrain confirmation essential, especially on older trucks that may have seen wheel or suspension changes over time.
The 1991 Isuzu Trucks Rodeo S 4x4 w/aluminum wheels uses the same 31X10.50R15 radial fitment as the other 4x4 Rodeos. Tire choice should center on confirming wheel width and preserving the right overall stance for a four-wheel-drive truck.
The 1991 Isuzu Trucks Rodeo XS 4x2 uses 225/75R15 radial tires on 15-inch rims. That gives room to choose among several whitewall radial offerings without stepping away from the primary 4x2 fitment.
The 1991 Isuzu Trucks Rodeo XS 4x2 w/aluminum wheels also uses 225/75R15 radials. The main selection questions are appearance and wheel compatibility rather than a different tire size tied to the wheel material.
The 1991 Isuzu Trucks Rodeo XS 4x4 uses the 31X10.50R15 radial size. That larger flotation-style tire format is part of the 4x4 fitment story, so the buyer should verify that the truck still carries the correct wheel and clearance setup.
The 1991 Isuzu Trucks Rodeo XS 4x4 w/aluminum wheels uses the same 31X10.50R15 radial tire size as other 4x4 Rodeos. Selection is straightforward once the drivetrain is confirmed, with attention paid to wheel width and the truck's current ride height.
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 Isuzu Trucks Rodeo Tires for Sale
Available 1991 Isuzu Trucks Rodeo tires span two very different fitments: 225/75R15 whitewall radials from BFGoodrich, Coker Classic, American Classic, Maxxis, and Travelstar, plus a 31X10.50R15 BFGoodrich All-Terrain T/A KO2 with raised white letters for 4x4 applications.
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Radial Tires
BFGoodrich Silvertown Radial | 2.75 Inch Whitewall | 225/75R15
These answers focus on the two Rodeo fitment paths: 225/75R15 for 4x2 models and 31X10.50R15 for 4x4 models. They also cover 15-inch rim fitment, product selection, appearance choices, and the checks worth making before regular road use.
Tire Size & Fitment
What tire size fits a 1991 Isuzu Trucks Rodeo?
The 1991 Isuzu Trucks Rodeo uses two primary tire sizes. Two-wheel-drive sub-models use 225/75R15 radial tires, while four-wheel-drive sub-models use 31X10.50R15 radial tires. Both sizes fit 15-inch rims, but they are not the same overall tire format or application.
The first thing to confirm is whether the truck is a 4x2 or 4x4, since that determines the correct size. On an older Rodeo, it is also smart to check the actual wheel and tire already installed, especially if the truck has had wheel, suspension, or trim changes over the years.
What size rim does a 1991 Isuzu Trucks Rodeo use?
The 1991 Isuzu Trucks Rodeo uses a 15-inch rim diameter with both of its primary tire sizes. The 225/75R15 radial and the 31X10.50R15 radial are both built for 15-inch wheels, even though the tires differ substantially in width and overall proportions.
Rim diameter is only part of the fitment picture, so wheel width still matters before choosing a tire. A 225/75R15 passenger-style radial and a 31X10.50R15 flotation-style radial do not use the same wheel-width ranges, which makes it important to verify the truck's actual wheel setup before purchase.
Do all 1991 Isuzu Trucks Rodeo sub-models use the same tire size?
No, the 1991 Isuzu Trucks Rodeo does not use one tire size across every sub-model. LS, S, and XS trims share sizes within drivetrain groups, with 225/75R15 on 4x2 versions and 31X10.50R15 on 4x4 versions, including models with aluminum wheels.
That means trim level by itself is less important than identifying whether the truck is two-wheel drive or four-wheel drive. Aluminum wheels do not change the primary tire size here, but the actual wheel width should still be checked before selecting among the available radial tire options.
Choosing the Right Tire
What should I consider when choosing a tire for a 1991 Isuzu Trucks Rodeo?
Start with the correct primary size for the truck's drivetrain: 225/75R15 for 4x2 models or 31X10.50R15 for 4x4 models. From there, the real choice becomes tire type and presentation, including whitewall street-oriented radials for the smaller size and an all-terrain radial for the larger 4x4 size.
Wheel width, intended use, and the truck's current setup should guide the final decision. A Rodeo used mainly on pavement may call for a different look than one kept in a more utility-focused 4x4 configuration, and older trucks should always have wheel and clearance details checked before changing tires.
What sidewall styles are available for 1991 Isuzu Trucks Rodeo tires?
Sidewall choices vary by size on the 1991 Isuzu Trucks Rodeo. In 225/75R15, available styles include narrow whitewall and wide whitewall designs. In 31X10.50R15, the available option uses RWL, or raised white letters, which gives the 4x4 fitment a more traditional light-truck appearance.
The sidewall you choose can change the character of the truck even when the tire size stays correct. A whitewall radial tends to suit a cleaner road-going presentation, while raised white letters align more naturally with the Rodeo's 4x4 utility look, so appearance should be considered alongside size and wheel compatibility.
What brands offer tires for the 1991 Isuzu Trucks Rodeo?
Available tire brands for the 1991 Isuzu Trucks Rodeo include BFGoodrich, Coker Classic, American Classic, Maxxis, and Travelstar. Most of that variety appears in the 225/75R15 size used on 4x2 models, while the 31X10.50R15 4x4 fitment is represented by a BFGoodrich all-terrain option.
Brand choice should be weighed together with size, sidewall styling, tire series, and wheel-width suitability rather than treated as a standalone decision. On a vehicle like the Rodeo, the right brand is the one that offers the correct fitment and the appearance or use pattern that matches the specific truck.
Restoration & Appearance
Which tire should I choose for a period-style 1991 Isuzu Trucks Rodeo?
A period-style choice for a 1991 Isuzu Trucks Rodeo starts with keeping the correct drivetrain-based size. A 4x2 truck points toward 225/75R15 radial options, while a 4x4 truck uses 31X10.50R15. Within those sizes, sidewall styling has a big effect on whether the truck presents as more road-oriented or more utility-driven.
Whitewall radials can give a 4x2 Rodeo a distinctive early-1990s custom or restoration-oriented look, while raised white letters suit the larger 4x4 fitment more naturally. For exact originality, the best approach is to compare against period photos, build records, or marque-specific references before settling on a particular brand or sidewall treatment.
How does tire construction affect the appearance of a restored 1991 Isuzu Trucks Rodeo?
On the 1991 Isuzu Trucks Rodeo, the primary fitments are already radial, so the appearance question is less about switching construction and more about choosing the right radial style. The visual difference comes from tire profile, overall size, and sidewall treatment rather than from a bias-ply-versus-radial decision.
That makes proper sizing especially important on a restoration-minded truck. A 225/75R15 on a 4x2 and a 31X10.50R15 on a 4x4 create very different proportions, so using the right size for the specific sub-model helps preserve stance and visual balance before details like whitewalls or raised white letters are chosen.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1991 Isuzu Trucks Rodeo?
Yes, modifications can affect tire fitment on a 1991 Isuzu Trucks Rodeo even when the tire size itself is correct for the sub-model. Aftermarket wheels, suspension lifts or lowering, altered ride height, and body or steering changes can all influence clearance around the tire and wheel assembly.
That matters especially on trucks carrying 31X10.50R15 tires, since a wider and taller tire leaves less room for assumption. Any Rodeo with non-stock wheels should have rim width and steering clearance checked carefully, and a 4x2-to-4x4 size mix-up should be ruled out before the next set of tires is chosen.
What should I inspect before driving a 1991 Isuzu Trucks Rodeo on new tires?
Before driving a 1991 Isuzu Trucks Rodeo on new tires, inspect the wheels for correct diameter and width, check that lug hardware seats properly, and confirm that the tire size matches the truck's 4x2 or 4x4 configuration. It is also wise to look over suspension, steering, and brake components while the tires are off.
Once the tires are mounted, verify inflation pressure, watch for any signs of rubbing at full steering lock, and confirm even clearance at the fenders and suspension. A short test drive followed by a second inspection can catch issues early, especially on an older SUV that may not still be in stock condition.
How often should tires on a 1991 Isuzu Trucks Rodeo be inspected?
Tires on a 1991 Isuzu Trucks Rodeo should be inspected regularly, not just when tread appears worn. A monthly pressure and condition check is a sensible routine, and any truck that sees infrequent use should also be examined for sidewall cracking, flat spotting, cuts, bulges, or gradual air loss before being driven.
Collector-age SUVs often spend time parked, which can hide age-related issues until the vehicle returns to the road. Checking tread wear patterns also helps reveal alignment, suspension, or inflation problems early, and that is especially useful when a Rodeo has larger 4x4 tires or wheels that may have been changed at some point.
