The 2019 Infiniti Q50 sits in the modern sport-sedan space where sharp styling, rear-drive performance roots, and trim-specific setups all influence tire choice. On this car, tire fitment is not one-size-fits-all: the Q50 uses four primary radial sizes, including 17-inch, 18-inch, and 19-inch applications, with the Red Sport 400 RWD adding a staggered arrangement. Available choices range from blackwall performance-oriented radials to Silvertown Radial options with wide whitewall or redline styling in 225/55R17. The key is matching the exact sub-model and wheel diameter first, then choosing the tire character that best suits daily driving, appearance, or a more aggressive sport-sedan presentation.
Which Tire Size Is Right for The 2019 Infiniti Q50
The 2019 Infiniti Q50 uses four primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Some versions use a square setup, while the Red Sport 400 RWD uses a staggered 19-inch arrangement with different front and rear sizes. Before choosing a tire, confirm whether your car is a Pure, Luxe, Sport, or Red Sport 400 and verify the wheel diameter currently on the car.
225/50R18 is a metric radial size in which 225 is the section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 18 is the wheel diameter in inches. On the 2019 Infiniti Q50, this size suits an 18-inch-wheel configuration and keeps the fitment in a modern radial format consistent with the car’s late-model sport-sedan character. Available choices center on BFGoodrich blackwall performance tires across the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. This size is the one to evaluate when your Q50 has the proper 18-inch setup and you want to compare tire series within that fitment.
225/55R17 is a metric radial size that uses a 225-millimeter section width, a 55-series profile, and a 17-inch rim. For the 2019 Infiniti Q50, this size belongs to the 17-inch-wheel configuration and offers the broadest visible appearance range, not just a single type of tire. BFGoodrich options include blackwall g-Force tires along with Silvertown Radial choices in wide whitewall and redline treatments. This is the size to focus on if your car is equipped with 17-inch wheels and you want to balance modern radial fitment with either a straightforward blackwall look or a more distinctive period-inspired sidewall style.
Fit(s): Red Sport 400 (AWD), Red Sport 400 (RWD) Front, Sport (AWD), and Sport (RWD)
Construction: Radial|Rim: 19 in
245/40R19 is a metric radial size with a 245-millimeter section width, a 40-series profile, and a 19-inch wheel diameter. On the 2019 Infiniti Q50, this size is used on several 19-inch sport-oriented configurations, including Sport AWD, Sport RWD, and Red Sport 400 front or AWD applications, so it is important not to assume it belongs to every Q50. Available products are blackwall BFGoodrich radials in the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A lines. Choose this size only after confirming that your car’s sub-model and wheel setup call for the 19-inch front or square-fitment arrangement.
265/35R19 is a wider metric radial size with a 265-millimeter section width, a 35-series profile, and a 19-inch rim diameter. On the 2019 Infiniti Q50, this is not a universal fitment; it serves the rear position on the Red Sport 400 RWD, where the car uses a staggered setup instead of matching front and rear tire sizes. Product choices include BFGoodrich blackwall g-Force Sport Comp 2 and g-Force Phenom T/A options, along with the Nitto NT555 G2. This size matters when maintaining the intended rear-wheel-drive staggered layout rather than converting the car to a square tire arrangement without checking wheel width and clearance.
Sub-model fitment matters on the 2019 Infiniti Q50 because tire size changes across the range, and wheel diameter changes with it. The first step is identifying the exact trim and whether the car uses a square setup or the staggered Red Sport 400 RWD arrangement.
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2019 Infiniti Q50 Luxe
The 2019 Infiniti Q50 Luxe uses the 225/50R18 radial size, placing it on an 18-inch wheel setup rather than the 17-inch or 19-inch arrangements found elsewhere in the range. Tire selection here is mainly about choosing among available blackwall radial series once the wheel size on the car has been confirmed.
The 2019 Infiniti Q50 Pure uses the 225/55R17 radial size, which separates it from the 18-inch and 19-inch Q50 configurations. This fitment gives you a wider visual range than some other trims, including blackwall, wide whitewall, and redline choices within the correct size.
The 2019 Infiniti Q50 Red Sport 400 (AWD) uses 245/40R19 radial tires, keeping the car on a 19-inch setup without the rear stagger found on the rear-drive Red Sport. Tire choice centers on selecting the right blackwall radial series for that 19-inch fitment and confirming the actual wheel package on the car.
The front position on the 2019 Infiniti Q50 Red Sport 400 (RWD) uses 245/40R19, making it part of a staggered 19-inch setup rather than a same-size arrangement at all four corners. Front tire selection should be made with the matching rear fitment in mind so the car retains its intended staggered layout.
The rear position on the 2019 Infiniti Q50 Red Sport 400 (RWD) uses 265/35R19, a wider radial size than the front axle carries. That means rear tire replacement should focus on maintaining the correct staggered setup and checking wheel width carefully before substituting another size or changing tire series.
The 2019 Infiniti Q50 Sport (AWD) uses 245/40R19 radial tires, placing it with the 19-inch sport-oriented fitments in the Q50 lineup. Selection is straightforward once that setup is confirmed, with the main comparison points being tire series and the character of the available blackwall radial options.
The 2019 Infiniti Q50 Sport (RWD) uses 245/40R19 radial tires and stays with a 19-inch fitment rather than the smaller-diameter setups used on other trims. Tire choice here is less about appearance variation and more about selecting the right radial series for the correct wheel size and intended driving use.
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 2019 Infiniti Q50 Tires for Sale
Available 2019 Infiniti Q50 tire choices span BFGoodrich and Nitto, with fitments across 17-inch, 18-inch, and 19-inch sizes. Depending on the exact size, buyers can compare blackwall performance-oriented series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and select Silvertown Radial whitewall or redline options.
Tire questions for the 2019 Infiniti Q50 usually come down to trim-specific sizing, 17-inch versus 18-inch versus 19-inch wheel fitment, and whether the car uses a square or staggered setup. The answers below focus on exact size selection, product differences, appearance choices, and practical checks before road use.
Tire Size & Fitment
What tire size fits a 2019 Infiniti Q50?
The 2019 Infiniti Q50 uses four primary tire sizes: 225/55R17, 225/50R18, 245/40R19, and 265/35R19. The correct size depends on the exact trim and wheel package, with the Pure using 225/55R17, the Luxe using 225/50R18, and several Sport and Red Sport 400 configurations using 245/40R19.
The 265/35R19 size is used at the rear of the Red Sport 400 RWD, which means that model has a staggered setup rather than the same tire size at all four corners. Start by confirming the sub-model and the wheel diameter currently on the car, especially if it has changed hands or may have aftermarket wheels.
What size rim does a 2019 Infiniti Q50 use?
A 2019 Infiniti Q50 can use 17-inch, 18-inch, or 19-inch rims, depending on the exact trim and tire size. The 225/55R17 fitment uses a 17-inch wheel, the 225/50R18 fitment uses an 18-inch wheel, and both 245/40R19 and 265/35R19 use 19-inch wheels.
Wheel diameter is the first thing to verify before choosing tires because those sizes are not interchangeable across different rim diameters. It is also worth checking the actual wheel setup on the car, since trim changes, aftermarket wheels, or replacement wheel packages can leave a Q50 wearing something different from its original configuration.
Why does the 2019 Infiniti Q50 have more than one tire size?
The 2019 Infiniti Q50 has more than one tire size because fitment changes by sub-model and wheel package. Pure, Luxe, Sport, and Red Sport 400 versions do not all use the same setup, and the Red Sport 400 RWD adds an extra distinction by using different front and rear tire sizes.
That means tire selection should start with trim identification rather than choosing by appearance alone. A 17-inch, 18-inch, or 19-inch Q50 needs the matching wheel diameter, and the staggered Red Sport 400 RWD needs its front and rear positions treated separately to preserve the intended layout and avoid mismatch problems.
Choosing the Right Tire
What should I consider when choosing a 2019 Infiniti Q50 tire?
Start with the exact tire size your 2019 Infiniti Q50 uses, then match the wheel diameter and construction. All primary Q50 fitments here are radial, so the real comparison points are the correct size, the trim-specific setup, and the differences between available tire series in that same fitment.
After size is confirmed, compare things that affect how the car presents and how the tire is intended to be used, such as sidewall treatment, rim-width compatibility, and load figures where they are stated. On a Red Sport 400 RWD, also confirm whether you are buying for the front or rear axle before making a selection.
What sidewall styles are available for 2019 Infiniti Q50 tires?
Blackwall is the most common sidewall style available for the 2019 Infiniti Q50, especially in the 18-inch and 19-inch sport-sedan sizes. In 225/55R17, the Q50 also has BFGoodrich Silvertown Radial options with wide whitewall and redline sidewall treatments, which create a very different visual effect from standard blackwall tires.
The right choice depends on the exact trim and the look you want from the car. A Pure running 225/55R17 gives room for either a conventional blackwall presentation or a more stylized appearance, while the larger 19-inch Q50 fitments stay focused on blackwall performance-oriented radials.
What brands offer tires for the 2019 Infiniti Q50?
BFGoodrich appears across all four primary 2019 Infiniti Q50 sizes, covering blackwall g-Force options and, in 225/55R17, Silvertown Radial styles with whitewall or redline sidewalls. Nitto is also available in 265/35R19, which is the rear size used on the Red Sport 400 RWD staggered fitment.
Brand choice should still begin with the exact size and position on the car rather than name alone. On most Q50 fitments, the comparison is mainly between BFGoodrich tire series, while the staggered Red Sport rear size adds another brand option that should be checked against the rear wheel setup before selection.
Restoration & Appearance
Which tire should I choose for a period-style 2019 Infiniti Q50?
A period-style approach on a 2019 Infiniti Q50 usually means keeping the correct trim-specific size first, then selecting a tire that gives the car the presentation you want. In the Q50 lineup, 225/55R17 offers the broadest appearance range because it includes blackwall, wide whitewall, and redline radial choices.
That makes the Pure the trim with the most obvious visual flexibility, while the 18-inch and 19-inch Q50 fitments stay more modern in appearance. For an owner focused on a specific look rather than pure factory-style presentation, the sidewall treatment matters almost as much as the tire series itself.
How does tire construction affect the appearance of a restored 2019 Infiniti Q50?
On the 2019 Infiniti Q50, the primary fitments are already radial, so construction choice is less about switching from one vintage tire type to another and more about the visual character of the available radial products. The most noticeable appearance differences come from sidewall styling, especially in 225/55R17.
A blackwall keeps the car visually contemporary, while a wide whitewall or redline creates a more custom or throwback presentation. Even on a newer collector-era sedan, staying with the correct size remains the foundation, because the wrong diameter or profile can change the car’s stance more dramatically than the tire construction itself.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Infiniti Q50?
Yes, modifications can affect tire fitment on a 2019 Infiniti Q50, especially because the car already spans 17-inch, 18-inch, and 19-inch factory-type sizes and includes one staggered setup. Aftermarket wheels, suspension changes, altered ride height, or spacer use can all change clearance and wheel-width requirements.
That matters most on 19-inch configurations, where a wider rear fitment like 265/35R19 already has a specific role on the Red Sport 400 RWD. Any modified Q50 should have its actual wheel diameter, wheel width, and front-to-rear setup verified before a new tire is chosen simply by trim name.
What should I inspect before driving a 2019 Infiniti Q50 on new tires?
Before driving a 2019 Infiniti Q50 on new tires, inspect the wheels for damage, confirm the tire size matches the car’s trim and axle position, and check that inflation pressure is set appropriately for the installed tires. It is also smart to look over tread seating, valve stems, and any signs of rubbing at full steering lock.
A Q50 with staggered Red Sport 400 RWD fitment deserves extra attention so the front and rear sizes do not get mixed. Once the car is on the road, keep an eye on vibration, pulling, uneven wear, or contact marks inside the wheelhouse, since those early clues can point to wheel or alignment issues.
What should I check before a longer drive in a 2019 Infiniti Q50?
Before a longer drive in a 2019 Infiniti Q50, check tire pressure, tread condition, sidewall condition, and any visible cuts, bulges, or air loss. It is also worth confirming that all four tires match the car’s intended setup, particularly on a Red Sport 400 RWD where the rear 265/35R19 size should not be confused with the front 245/40R19.
Longer trips also make it worthwhile to inspect alignment-related wear and to confirm that the spare or roadside plan matches the car’s wheel package. A Q50 that has sat for extended periods should have its tires checked for age-related hardening or flat spotting before being put back into regular highway use.
