The 1999 Infiniti Q45 came from a period when flagship Japanese luxury sedans balanced quiet highway comfort with a more athletic edge than many buyers expected. Its tire fitment reflects that split personality, because the 1999 Infiniti Q45 uses two different modern radial sizes depending on sub-model: 215/60R16 or 225/50R17. That makes wheel diameter and trim identification the first step before choosing a replacement tire. The available choices lean toward blackwall radial performance-oriented options, especially in 225/50R17 from BFGoodrich and Nitto. For a sedan like the Q45, the right decision is less about vintage-style construction and more about matching the correct size to the exact setup and intended road use.
Which Tire Size Is Right for The 1999 Infiniti Q45
Two tire sizes apply to the 1999 Infiniti Q45, and they are tied to different sub-models as well as different wheel diameters. The Base uses a 16-inch fitment with 215/60R16, while the Q45 T uses a 17-inch fitment with 225/50R17, so the first job is confirming the exact sub-model and the actual wheel diameter on the car before selecting a tire.
A 215/60R16 tire uses a 215-millimeter nominal section width, a 60-series aspect ratio, radial construction, and a 16-inch rim diameter. On the 1999 Infiniti Q45, this is a modern radial fitment rather than an older bias-ply or alphanumeric size, so the sizing language is familiar to most modern buyers. Its practical role is tied to the Base sub-model, making it important to confirm that the car still has its original wheel diameter if it has changed hands or been modified. This size should be chosen by buyers matching the 16-inch setup rather than by appearance alone.
A 225/50R17 tire indicates a 225-millimeter nominal section width, a 50-series profile, radial construction, and a 17-inch rim diameter. For the 1999 Infiniti Q45, this size belongs to the Q45 T configuration and carries a more performance-oriented replacement market, including blackwall choices from BFGoodrich and Nitto across several tire series. Those options also bring rim-width and load-spec differences worth comparing within the same size. This is the size to evaluate when the car has the 17-inch wheel package and the goal is a correct fitment match for that setup.
Sub-model fitment matters on the 1999 Infiniti Q45 because the covered trims do not share the same tire size. Tire selection starts with confirming whether the car is a Base or a Q45 T, and then verifying that the wheels on the vehicle still match that original diameter.
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1999 Infiniti Q45 Base
The 1999 Infiniti Q45 Base uses a 16-inch radial tire fitment centered around 215/60R16. That makes wheel-diameter confirmation especially important on cars that may have received later wheel swaps, since the correct replacement tire needs to match the actual rim on the car.
The 1999 Infiniti Q45 T uses a 17-inch radial fitment based on 225/50R17. Buyers looking at this sub-model should compare the available blackwall performance-oriented options within that size and check rim-width compatibility before settling on a specific tire.
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 1999 Infiniti Q45 Tires for Sale
Current product choices center on 225/50R17, with blackwall radial options from BFGoodrich and Nitto across the g-Force Comp 2 AS, g-Force Sport Comp 2, and Nitto NT555 G2 series. Within that size, useful comparison points include tire series, rim-width specifications, weight, and load figures.
The most useful tire questions for the 1999 Infiniti Q45 usually come down to identifying the correct sub-model, matching the right wheel diameter, and comparing available radial choices by series, fitment details, and road-use priorities.
Tire Size & Fitment
What tire size fits a 1999 Infiniti Q45?
The 1999 Infiniti Q45 uses two different radial tire sizes depending on sub-model. The Q45 Base uses 215/60R16, while the Q45 T uses 225/50R17. Both are modern metric radial sizes, but they are not interchangeable as primary fitments because they correspond to different wheel diameters.
The practical step is to confirm both the trim level and the actual wheels on the car before ordering tires. A Q45 that has been modified, fitted with take-off wheels, or changed over the years may no longer match its original sub-model setup, so measuring the installed rim diameter is the safest way to start.
What size rim does a 1999 Infiniti Q45 use?
A 1999 Infiniti Q45 uses either a 16-inch or 17-inch rim, depending on sub-model. The Base model is associated with a 16-inch wheel and 215/60R16 tires, while the Q45 T uses a 17-inch wheel with 225/50R17 tires.
That difference matters because tire size selection starts with rim diameter, not just tread width or sidewall height. A 16-inch tire cannot be mounted on a 17-inch wheel, and the reverse is also true, so a quick wheel check can prevent choosing the right-looking size for the wrong physical wheel.
Do all 1999 Infiniti Q45 sub-models use the same tire size?
No. The 1999 Infiniti Q45 Base and 1999 Infiniti Q45 T do not share the same tire size. The Base uses 215/60R16, while the T uses 225/50R17, and both fitments are radial.
That means the exact sub-model is more than a naming detail; it directly affects the tire and wheel combination. On a sedan that may have changed owners several times, it is wise to confirm the door-jamb information, inspect the tires already on the car, and verify the wheel diameter before selecting a replacement.
Choosing the Right Tire
What should I consider when choosing a tire for a 1999 Infiniti Q45?
Start with the correct size for the exact sub-model and wheel diameter. A 1999 Infiniti Q45 Base calls for 215/60R16, while a Q45 T uses 225/50R17, so the first decision is fitment accuracy rather than brand preference.
After that, compare the tire's intended character, rim-width compatibility, weight, and load specifications where those figures are available. On a luxury sedan, the right choice usually comes down to whether the goal is preserving the car's original driving balance, supporting a more performance-oriented setup, or simply matching the actual wheels installed now.
What brands offer tires for the 1999 Infiniti Q45?
For the 1999 Infiniti Q45's 225/50R17 fitment, available brands include BFGoodrich and Nitto. Those choices appear in several series, including BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Sport Comp 2, and Nitto NT555 G2, all in blackwall radial form.
Brand matters most when it brings a different tire series or specification set rather than a different fitment. The useful comparison points are whether the tire suits the car's intended use, whether the wheel width falls inside the approved range, and whether the load and construction details align with how the Q45 will actually be driven.
What tire series are available for the 1999 Infiniti Q45?
In the 225/50R17 fitment used by the 1999 Infiniti Q45 T, available tire series include g-Force Comp 2 AS, g-Force Sport Comp 2, and Nitto NT555 G2. All of them are radial blackwall tires, but the series names help separate the choices inside the same basic size.
Comparing series is useful when the tire size itself is already settled and the buyer is deciding among available product personalities. Once the car's wheel diameter and width are confirmed, the series comparison becomes a way to sort through fitment details such as rim-width range, weight, and load figures without changing the underlying tire size.
Restoration & Appearance
Which tire should I choose for a period-style 1999 Infiniti Q45?
A period-style 1999 Infiniti Q45 tire choice starts with using the correct sub-model fitment: 215/60R16 for the Base or 225/50R17 for the Q45 T. Because this car uses modern metric radial sizes, maintaining the proper size and wheel diameter does more for an era-appropriate look than chasing an older construction style would.
Appearance still needs to work with the car's actual setup, especially if wheels have been changed over time. Buyers restoring a Q45 for authentic presentation should confirm trim-specific wheel fitment and compare tire profile carefully, since the visual balance of a late-1990s luxury sedan depends heavily on keeping the correct relationship between wheel and sidewall.
How does tire construction affect the appearance of a restored 1999 Infiniti Q45?
Tire construction is straightforward on a restored 1999 Infiniti Q45 because the applicable primary fitments are radial. That keeps the visual decision focused less on bias-ply-versus-radial appearance and more on choosing the correct metric size, sidewall profile, and wheel diameter for the specific sub-model.
The strongest appearance difference on this car usually comes from whether the tire matches the original 16-inch or 17-inch setup and whether the sidewall proportion looks right on the body. A restoration-minded owner should check the car against factory literature, marque references, or original wheel specifications before choosing a replacement based mainly on looks.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1999 Infiniti Q45?
Yes. Modifications can change tire fitment on a 1999 Infiniti Q45 even when the original size is known. Aftermarket wheels, different wheel widths, suspension changes, lowering, or body alterations can all affect how a 215/60R16 or 225/50R17 tire sits and clears the car.
That is why the actual setup on the vehicle matters more than assumptions based on trim alone. Checking wheel diameter, wheel width, steering clearance, and fender clearance before replacing tires helps avoid problems, especially on a Q45 that may no longer be running the same wheel package it left the factory with.
What should I inspect before driving a 1999 Infiniti Q45 on new tires?
Before driving a 1999 Infiniti Q45 on new tires, inspect the wheels for damage, confirm that the tire size matches the correct 16-inch or 17-inch setup, and check inflation once the tires are mounted. It is also smart to look over suspension and steering components for wear that could affect how the new tires behave.
A road-ready inspection should also include verifying clearance at full steering lock, looking for uneven old tire wear that may point to alignment issues, and making sure there are no rubbing points inside the wheelhouse. On a heavier luxury sedan, those basic checks help the new tires wear evenly and track as intended.
How often should tires on a 1999 Infiniti Q45 be inspected?
Tires on a 1999 Infiniti Q45 should be inspected regularly, not just when tread appears low. Monthly pressure checks, visual inspection for cracking, cuts, bulges, and uneven wear, and a closer look before longer trips are all sensible habits, especially on an older car that may spend time parked.
Collector-age vehicles can age their tires out before they wear them out, so condition matters as much as mileage. Regular inspection also helps catch issues related to alignment, wheel damage, or slow air loss before they become more serious, and that is particularly useful when the car uses trim-specific wheel and tire combinations.
