1991 Toyota Trucks 4Runner Tires

A 1991 Toyota Trucks 4Runner uses two primary tire sizes: 225/75R15 and 31X10.50R15. Both are radial tires and both fit 15-inch wheels, but they represent very different tire formats, overall proportions, and intended vehicle presentation.

The correct choice depends on how your 4Runner SR5 is currently equipped. A truck with stock-type road wheels may point you toward 225/75R15, while a taller off-road-style setup may use 31X10.50R15. Confirm the wheel width, the actual tire already on the vehicle, and available clearance before choosing between the two sizes.

Both tire sizes used on the 1991 Toyota Trucks 4Runner mount on 15-inch rims. That means the shared wheel diameter is straightforward, even though the two tire sizes differ significantly in width and overall height.

Wheel diameter is only part of the fitment picture. Rim width matters too, especially when moving between the narrower 225/75R15 and the wider 31X10.50R15. Before replacing tires, check the actual wheel width stamped on the rim or verify it with a tire professional so the tire and wheel combination stays within an appropriate range.

The 1991 Toyota Trucks 4Runner appears with both 225/75R15 and 31X10.50R15 because the model can be equipped in more than one way while still using a 15-inch wheel. One size follows a metric passenger-style format, while the other is a flotation-style truck size.

That difference affects the look and setup of the vehicle more than the wheel diameter itself. A taller, wider tire can change clearance needs and overall stance, so the practical step is to match the replacement to the 4Runner’s current wheels and suspension condition rather than choosing by year and model alone.

Start with the actual tire size and wheel setup on the vehicle, because this 4Runner can use either 225/75R15 or 31X10.50R15. Both are radial tires for 15-inch wheels, but they serve different visual and practical roles.

Once size is confirmed, compare the details that shape the finished result: sidewall style, tire series, rim-width compatibility, load figure, and intended use. A whitewall 225/75R15 creates a very different look from a raised white letter 31X10.50R15, so the right choice depends on whether the truck is being kept road-oriented, restoration-minded, or more trail-focused.

Sidewall choices for the 1991 Toyota Trucks 4Runner include wide whitewall, narrow whitewall, and RWL, or raised white letter. The whitewall options appear in 225/75R15 products, while the 31X10.50R15 option uses a raised white letter truck-style presentation.

That makes sidewall selection an important appearance decision as much as a fitment one. A whitewall can give the 4Runner a more distinctive period-flavored look, while raised white letters suit a more aggressive utility setup. After confirming the correct size, choose the sidewall treatment that matches the truck’s wheels, stance, and overall character.

Tires for the 1991 Toyota Trucks 4Runner are available from BFGoodrich, Coker Classic, American Classic, Maxxis, and Travelstar. Most of that variety appears in 225/75R15, while the 31X10.50R15 option is represented by BFGoodrich.

Brand alone should not make the decision. Compare the size first, then look at sidewall style, tire series, rim-width range, and whether the tire supports the appearance and use you want from the truck. That approach keeps the selection grounded in actual fitment rather than choosing a tire only by name recognition.

For a period-style 1991 Toyota Trucks 4Runner, 225/75R15 usually presents the more traditional starting point because it is the road-oriented metric size offered for this model. Within that size, whitewall variations create a noticeably different visual character from a truck-style off-road tire.

The final choice depends on how the vehicle is being finished and used. A restoration-minded truck with stock-type wheels may lean toward one of the whitewall radial options, while a 4Runner built around a taller utility stance may still suit 31X10.50R15. If exact historical authenticity matters, compare your truck against marque references and surviving original examples.

Tire construction is simpler on this vehicle because both primary fitments are radial. The visual difference comes less from bias-ply versus radial and more from the size format itself, since 225/75R15 and 31X10.50R15 create distinctly different proportions on the truck.

A restored 4Runner fitted with a whitewall metric radial will read very differently than one wearing a tall raised-white-letter all-terrain tire. That is why appearance planning should include wheel width, ride height, and the intended era flavor of the finished truck. Correct size selection influences stance just as much as sidewall styling.

Yes, modifications can affect tire fitment on a 1991 Toyota Trucks 4Runner, especially because the larger 31X10.50R15 size asks more from wheel width and vehicle clearance than 225/75R15. Changes to wheels, ride height, suspension components, or body clearance can all alter what works safely.

A 4Runner with aftermarket wheels may have a different offset or width than expected, and a lifted or lowered truck can change how the tire sits during turning and suspension travel. Check the actual wheel dimensions and inspect clearance at the fender, frame, and steering range before moving to a larger tire format.

Before driving a 1991 Toyota Trucks 4Runner on new tires, inspect the wheels for damage, verify the wheel diameter and width, and make sure the tires are inflated appropriately for the application. It is also smart to look over the suspension and steering components for looseness or wear.

A short visual check after installation can prevent larger problems. Look for adequate clearance at full steering lock, confirm there is no rubbing, and recheck inflation after the first miles of driving. On an older SUV, uneven wear patterns or vibration may point to alignment, balance, or component issues rather than the tire itself.

Tires on a 1991 Toyota Trucks 4Runner should be inspected regularly, and collector or occasional-use vehicles deserve extra attention because they often age out before they wear out. Check tread and sidewalls for cracking, cuts, bulges, punctures, and any sign of slow air loss.

A monthly pressure and condition check is a sensible routine, with another inspection before longer drives or trail use. Vehicles that sit for extended periods should also have their tires examined for flat spotting and environmental aging. Storage away from prolonged sunlight, heat, and ozone sources helps preserve tire condition between outings.