The 2015 Infiniti Trucks QX50 sits in the era when luxury crossovers were expected to blend sport-sedan reflexes with everyday usability, and this model’s tire fitment reflects that balance. Its compact, athletic character makes wheel and tire specification more than a cosmetic detail, especially when trim level and wheel package can change the size used. The 2015 Infiniti Trucks QX50 uses radial tires in either 225/55R18 or 245/45R19, depending on configuration. That makes the key decision less about old-versus-new construction and more about confirming the exact sub-model and wheel diameter before comparing available tire choices. Once that is settled, the focus shifts to intended road use, handling character, and proper wheel compatibility.
Which Tire Size Is Right for The 2015 Infiniti Trucks QX50
Two tire sizes apply to the 2015 Infiniti Trucks QX50, and the right one depends on sub-model and wheel diameter. Both are radial sizes, but one uses an 18-inch rim and the other uses a 19-inch rim, so confirming the actual wheel setup comes first. The Base uses 225/55R18, while the Journey may use either size depending on configuration.
225/55R18 is a metric radial size in which 225 identifies section width in millimeters, 55 is the aspect ratio, R denotes radial construction, and 18 is the wheel diameter in inches. On the 2015 Infiniti Trucks QX50, this size is part of the primary fitment and suits the vehicle’s modern crossover layout. It is the straightforward fitment for the Base and is also used on some Journey configurations. Choosing this size starts with confirming that the vehicle still wears 18-inch wheels and has not been changed to a different wheel package.
245/45R19 is a metric radial size with a 245-millimeter section width, a 45-series profile, radial construction, and a 19-inch rim diameter. On the 2015 Infiniti Trucks QX50, this size applies to Journey configurations using the larger wheel setup rather than across the full model line. Available products in this size include BFGoodrich and Nitto options, with blackwall sidewalls and performance-oriented series such as g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. It is the size to evaluate when the vehicle has 19-inch wheels and the owner wants to compare brand and tire-series differences within that fitment.
Sub-model fitment matters on the 2015 Infiniti Trucks QX50 because tire size is not the same across every configuration. The first step is identifying whether the vehicle is a Base or Journey model, then confirming whether it has 18-inch or 19-inch wheels before selecting tires.
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2015 Infiniti Trucks QX50 Base
The 2015 Infiniti Trucks QX50 Base uses a single primary tire fitment, which keeps the sizing decision relatively simple once the original wheel setup is still in place. Tire selection then becomes a matter of choosing the right radial tire in that size and verifying wheel compatibility if the vehicle has been modified.
The 2015 Infiniti Trucks QX50 Journey can use either of the two primary tire sizes, so wheel diameter must be confirmed before a tire is chosen. That makes this sub-model more dependent on actual vehicle setup, especially if wheels have been changed or the vehicle’s current tires are not original to the configuration.
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 2015 Infiniti Trucks QX50 Tires for Sale
Available product choices center on 245/45R19 and include BFGoodrich and Nitto radial tires. The current selection stays within blackwall styling but varies by tire series, rim-width specification, load figure where stated, and overall product character.
Owners of a 2015 Infiniti Trucks QX50 usually need to sort out exact tire size, wheel diameter, and sub-model fitment before comparing available radial options. These FAQs also cover product-selection factors, appearance, modifications, and basic road-use checks.
Tire Size & Fitment
What tire size fits a 2015 Infiniti Trucks QX50?
The 2015 Infiniti Trucks QX50 uses either 225/55R18 or 245/45R19, depending on sub-model and wheel setup. The Base uses 225/55R18, while the Journey can use 225/55R18 or 245/45R19. Both are radial tire sizes, but they are built for different wheel diameters, so they are not interchangeable simply by name.
The most important step is confirming what is actually on the vehicle now. Check the sub-model, then verify whether the QX50 has 18-inch or 19-inch wheels before choosing tires. If the vehicle has aftermarket wheels or a previous owner changed the wheel package, use the wheel diameter and width as the starting point instead of assuming the current tire size is correct.
What size rim does a 2015 Infiniti Trucks QX50 use?
A 2015 Infiniti Trucks QX50 uses either an 18-inch or 19-inch rim, depending on tire size and configuration. The 225/55R18 fitment uses an 18-inch rim, and the 245/45R19 fitment uses a 19-inch rim. That rim diameter is part of the tire size itself, so it must match exactly when replacing tires.
Rim diameter should be verified before anything else because it determines which tire size family even belongs on the vehicle. A glance at the sidewall can help, but the wheel itself should also be confirmed if there is any doubt. Vehicles with changed wheels, replacement rims, or mixed used-car history deserve an extra check before comparing tread design or brand.
Do all 2015 Infiniti Trucks QX50 sub-models use the same tire size?
No, the 2015 Infiniti Trucks QX50 does not use one tire size across every sub-model. The Base uses 225/55R18, while the Journey may use 225/55R18 or 245/45R19. That means sub-model alone is helpful, but wheel diameter still needs to be checked on the Journey before selecting a replacement tire.
This matters because a Journey owner may see either size on a correctly equipped vehicle. Matching the existing wheel diameter is essential, and the current setup should be inspected closely if the crossover has aftermarket wheels or replacement tires from a prior owner. Once the exact size is confirmed, then it makes sense to compare available tire series, rim-width compatibility, and intended use.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 Infiniti Trucks QX50?
Start with the exact tire size and wheel diameter used on the vehicle, because the 2015 Infiniti Trucks QX50 may require either 225/55R18 or 245/45R19. After size is confirmed, the next considerations are radial construction, wheel compatibility, and how the vehicle is driven. A daily-driven crossover may call for different priorities than one used only occasionally.
Once fitment is settled, compare tire-series character, stated rim-width specifications where available, and any load figure tied to a specific product. The owner should also think about whether steering response, all-season use, or a sportier presentation matters most. Those details do not replace size verification, but they are what separate one valid tire choice from another within the same fitment.
What brands offer tires for the 2015 Infiniti Trucks QX50?
Current 245/45R19 tire choices for the 2015 Infiniti Trucks QX50 include BFGoodrich and Nitto. Within that size, BFGoodrich appears in more than one tire series, while Nitto offers the NT555 G2. These are all radial tires and all use blackwall styling, so brand and series differences become part of the product-selection process.
Brand choice should be considered alongside the exact tire series, not as a shortcut by itself. A QX50 owner should still confirm the correct size first, then look at wheel-width compatibility, stated load information where available, and the kind of driving the vehicle actually sees. That keeps the decision grounded in fitment and use instead of choosing by name alone.
What tire series are available for the 2015 Infiniti Trucks QX50?
In 245/45R19, the 2015 Infiniti Trucks QX50 has tire-series options that include BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2. Those series all stay within radial construction and blackwall presentation, but they give the owner more than one way to compare available products in the larger QX50 fitment.
Series names matter because they help separate tires that may share the same size but differ in stated rim-width specification, load figure where shown, and overall product emphasis. The right approach is to confirm that the vehicle actually uses 245/45R19, then compare the series details that relate to the intended use of the crossover rather than assuming every tire in the size serves the same purpose.
Restoration & Appearance
Which tire should I choose for a period-style 2015 Infiniti Trucks QX50?
A period-style 2015 Infiniti Trucks QX50 still starts with the correct modern radial size for the actual wheel package on the vehicle. That means 225/55R18 on the Base, or either 225/55R18 or 245/45R19 on the Journey depending on configuration. Because this is a late-model luxury crossover, maintaining the proper overall look usually comes from preserving the intended wheel-and-tire proportion rather than switching construction type.
The practical goal is to avoid a tire that changes the visual balance of the vehicle through the wrong wheel diameter or profile. A QX50 kept close to its original presentation should have its sub-model and wheel setup confirmed first, then the owner can compare available tire series within the right size. That approach keeps the appearance disciplined without turning style into guesswork.
Does correct tire fitment matter for a 2015 Infiniti Trucks QX50 restoration?
Yes, correct tire fitment matters even on a 2015 Infiniti Trucks QX50 because the tire size is tied directly to wheel diameter, stance, and the vehicle’s intended visual balance. Using 225/55R18 where 245/45R19 belongs, or the reverse, can change the look and may complicate fitment. The correct starting point is always the actual wheel package fitted to the vehicle.
A restoration-minded owner should verify the sub-model, check the wheel size on the vehicle, and inspect whether previous owners changed wheels or tires. After that, the focus can shift to choosing a radial tire that suits the desired presentation. Exact originality questions beyond basic size fitment are best checked against vehicle-specific records or marque guidance when appearance accuracy is especially important.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Infiniti Trucks QX50?
Yes, modifications can affect tire fitment on a 2015 Infiniti Trucks QX50 even when the tire size looks close on paper. Wheel changes, altered rim width, suspension lowering, and alignment changes can all influence whether the intended tire size works properly on the vehicle. That is especially important on the Journey, where more than one original size may already be in play.
A modified QX50 should be checked for actual wheel diameter, wheel width, and clearance at the fender and suspension before new tires are chosen. Steering travel should also be considered so the tire does not contact bodywork or suspension components. Those checks matter more than trim name alone once the vehicle has moved away from its original wheel-and-tire setup.
What should I inspect before driving a 2015 Infiniti Trucks QX50 on new tires?
Before driving a 2015 Infiniti Trucks QX50 on new tires, inspect the wheel size, confirm the tire size matches the wheel diameter, and check that inflation is set correctly for the vehicle’s use. The tires themselves should be free from shipping damage, cuts, bulges, or obvious bead-seating issues. Lug torque and general wheel condition also deserve attention.
After the basic installation check, look for adequate clearance at full steering lock and through normal suspension movement, especially if the QX50 has non-original wheels. A short, careful road test can help reveal vibration or rubbing before regular use. It also makes sense to recheck pressure and the overall installation after the first miles rather than assuming everything has settled perfectly.
How often should tires on a 2015 Infiniti Trucks QX50 be inspected?
Tires on a 2015 Infiniti Trucks QX50 should be inspected regularly, not only when replacement time arrives. A quick visual check every month and before longer drives is a sensible routine, with closer attention paid to tread wear, cuts, bulges, cracking, and any sign of pressure loss. Low-use vehicles still need inspection because age and storage conditions matter as much as mileage.
Inspection intervals become even more important if the crossover sees seasonal use or sits for stretches between drives. Uneven wear can also hint at wheel, suspension, or alignment issues that affect tire life and road manners. Keeping the correct size on the correct wheel is only part of the equation; regular condition checks help make sure the QX50 is ready for normal road use.
