The 2021 Infiniti Q50 sits in the modern sport-sedan category, blending luxury appointments with the sharper stance and road manners buyers expect from a performance-oriented four-door. Tire selection on this car is closely tied to trim level, with 17-inch, 18-inch, and 19-inch fitments across the Q50 range, and a staggered 19-inch setup on the Red Sport 400 (RWD). All primary fitments are radial, so the key decision is matching the exact size to the right sub-model and wheel. Available choices include performance-focused blackwall options, along with select restoration-style whitewall and redline treatments in 225/55R17 for buyers chasing a more distinctive visual presentation.
Which Tire Size Is Right for The 2021 Infiniti Q50
The 2021 Infiniti Q50 uses four primary tire sizes, and the right one depends on the exact sub-model and wheel setup. Fitment varies across 17-inch, 18-inch, and 19-inch rims, with some performance trims using different front and rear sizes, so the first step is confirming both the trim and the actual wheel diameter before choosing a tire.
225/50R18 is a metric radial size that uses a 225-millimeter section width, a 50-series aspect ratio, and an 18-inch rim diameter. On the 2021 Infiniti Q50, this is a primary radial fitment tied to the 18-inch wheel package rather than a broad all-model size. Available choices in this size center on BFGoodrich blackwall performance tires, including the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. This size suits buyers who need to keep the correct 18-inch fitment while comparing series character, load capability, and rim-width compatibility.
225/55R17 is a metric radial size with a 225-millimeter section width, a 55-series profile, and a 17-inch rim diameter. For the 2021 Infiniti Q50, it serves as the primary fitment for the 17-inch wheel application and remains a straightforward modern radial choice. Product options include BFGoodrich blackwall g-Force tires as well as Silvertown Radial versions with wide whitewall and redline sidewall treatments. This size is the one to evaluate when the goal is either maintaining the standard 17-inch fitment or giving the car a more customized visual style without changing rim diameter.
Fit(s): Red Sport 400 (AWD), Red Sport 400 (RWD) Front, Sensory, and Signature Edition
Construction: Radial|Rim: 19 in
245/40R19 is a metric radial size that combines a 245-millimeter section width with a 40-series profile on a 19-inch rim. On the 2021 Infiniti Q50, this size appears on several 19-inch applications and also serves as the front tire on the Red Sport 400 (RWD) staggered setup. BFGoodrich offers this size in blackwall g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A lines. This is the size to confirm when your Q50 wears 19-inch wheels up front, especially since some trims share it while others pair it with a different rear tire.
265/35R19 is a metric radial size with a 265-millimeter section width, a 35-series aspect ratio, and a 19-inch rim diameter. For the 2021 Infiniti Q50, this is not a universal 19-inch fitment; it is used as the rear tire on the staggered Red Sport 400 (RWD) setup. Available blackwall choices include BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Phenom T/A, and the Nitto NT555 G2. This size matters most when preserving the intended front-to-rear relationship of a staggered package rather than treating all 19-inch Q50 wheels as interchangeable.
Tire fitment on the 2021 Infiniti Q50 varies by sub-model, and the differences are significant enough that trim identification comes before product selection. Some versions use single-size front-and-rear setups, while the Red Sport 400 (RWD) uses a staggered 19-inch arrangement with different front and rear tires.
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2021 Infiniti Q50 Luxe
The 2021 Infiniti Q50 Luxe uses an 18-inch radial fitment built around the 225/50R18 size. Tire selection here is mainly about choosing among blackwall performance-oriented options while keeping the correct 18-inch wheel diameter and overall fitment profile.
The 2021 Infiniti Q50 Pure uses a 17-inch radial fitment based on 225/55R17. This opens the door to both modern blackwall performance tires and more appearance-driven whitewall or redline choices, so the decision can balance road use with visual style.
The 2021 Infiniti Q50 Red Sport 400 (AWD) uses 245/40R19 as its primary radial tire size. Choosing for this sub-model starts with confirming the 19-inch wheel setup, then comparing available blackwall performance tire series within that exact size.
The front of the 2021 Infiniti Q50 Red Sport 400 (RWD) uses 245/40R19 radial tires. That front fitment should be treated as part of a staggered package, so replacement planning should account for the matching rear size rather than selecting front tires in isolation.
The rear of the 2021 Infiniti Q50 Red Sport 400 (RWD) uses 265/35R19 radial tires. Rear tire choice should preserve the staggered layout, which means verifying that the wheel and tire arrangement remains consistent with the car's existing front-and-rear setup.
The 2021 Infiniti Q50 Sensory uses 245/40R19 as its radial tire size. Buyers in this trim mainly need to confirm the 19-inch wheel package and then compare the available blackwall performance series within that one primary size.
The 2021 Infiniti Q50 Signature Edition uses the 245/40R19 radial size. Tire selection is fairly straightforward once that 19-inch fitment is confirmed, with the main decision shifting to tire series, load specification, 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 2021 Infiniti Q50 Tires for Sale
Available 2021 Infiniti Q50 tires center on radial blackwall performance options from BFGoodrich, with Nitto also appearing in 265/35R19. The 225/55R17 size adds Silvertown Radial choices with wide whitewall and redline sidewalls, giving that fitment the widest appearance range.
Common 2021 Infiniti Q50 tire questions usually come down to trim-specific sizing, 17-inch versus 18-inch versus 19-inch wheel fitment, staggered Red Sport 400 setups, and how to choose between available radial tire series, sidewall styles, and maintenance checks.
Tire Size & Fitment
What tire size fits a 2021 Infiniti Q50?
The 2021 Infiniti Q50 uses four primary tire sizes: 225/55R17, 225/50R18, 245/40R19, and 265/35R19. The correct size depends on the exact sub-model and wheel package, with the Red Sport 400 (RWD) using a staggered setup that combines 245/40R19 in front and 265/35R19 in the rear.
That means the first job is not picking a brand or tread pattern, but confirming the trim and the wheel diameter actually on the car. A Q50 with aftermarket wheels, replacement rims, or a previous tire-size change should be checked carefully so the tire matches both the vehicle configuration and the current wheel setup.
What size rim does a 2021 Infiniti Q50 use?
The 2021 Infiniti Q50 uses 17-inch, 18-inch, and 19-inch rim diameters depending on sub-model. The Pure uses a 17-inch fitment, the Luxe uses an 18-inch fitment, and several 19-inch applications appear on the Sensory, Signature Edition, Red Sport 400 (AWD), and the staggered Red Sport 400 (RWD).
Rim diameter has to match the tire size exactly, so a 17-inch tire cannot be mounted on an 18-inch or 19-inch wheel. Tire shopping should start by reading the current size on the sidewall or checking the wheel itself, especially on cars that may have been upgraded from their original trim-level wheel package.
Do all 2021 Infiniti Q50 sub-models use the same tire size?
No, 2021 Infiniti Q50 sub-models do not all share the same tire size. The Pure uses 225/55R17, the Luxe uses 225/50R18, several 19-inch trims use 245/40R19, and the Red Sport 400 (RWD) adds a separate 265/35R19 rear size as part of a staggered arrangement.
That variation matters because two Q50s can look similar while using different wheel diameters or different front and rear tires. Matching the exact sub-model helps narrow the correct size quickly, but the final check should still be the wheel and the current tire markings, particularly on used vehicles with changed wheels or tire packages.
Choosing the Right Tire
What should I consider when choosing a 2021 Infiniti Q50 tire?
Start with the exact tire size and rim diameter used by the specific 2021 Infiniti Q50 sub-model. Every primary fitment on this car is radial, so once the size is confirmed, the comparison shifts to tire series, sidewall style where available, load specification, and the wheel-width range tied to that product.
A Pure owner looking at 225/55R17 has a broader appearance choice than most other Q50 trims, while 19-inch applications lean toward blackwall performance tires. It also helps to match the tire to the car's real use, whether that means everyday road miles, a more aggressive driving character, or preserving an existing staggered front-and-rear setup.
What sidewall styles are available for 2021 Infiniti Q50 tires?
Blackwall is the main sidewall style across most 2021 Infiniti Q50 tire sizes. In 225/55R17, additional choices include a wide whitewall Silvertown Radial and a redline Silvertown Radial, giving that 17-inch fitment a more customized or retro-inspired appearance than the other Q50 sizes.
Sidewall style should be chosen after size and wheel diameter are confirmed, since appearance options are not spread evenly across the Q50 range. A Pure owner has the most visual flexibility, while 18-inch and 19-inch buyers are largely comparing blackwall performance tires and deciding among series, brand availability, and other specification differences.
What brands offer tires for the 2021 Infiniti Q50?
BFGoodrich appears across all four primary 2021 Infiniti Q50 tire sizes, with g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and Silvertown Radial offerings depending on size. Nitto is also available in 265/35R19 through the NT555 G2, which applies to the rear of the Red Sport 400 (RWD) staggered setup.
Brand choice should be filtered through the exact size first, because not every brand or series appears in every Q50 fitment. Once the correct size is confirmed, compare the available brand options alongside sidewall style, load specification, rim-width compatibility, and whether the car uses the same size at all four corners or a staggered arrangement.
Restoration & Appearance
Which tire should I choose for a period-style 2021 Infiniti Q50?
A period-style approach on a 2021 Infiniti Q50 is more about visual personality than restoration accuracy, and the strongest appearance-driven fitment is 225/55R17. That size includes Silvertown Radial choices with wide whitewall and redline sidewalls, while the other Q50 sizes focus on blackwall performance-oriented tires.
The right choice depends on whether the goal is subtle customization or retaining a more contemporary sport-sedan look. Appearance should stay secondary to correct size and wheel fitment, so confirm that the car truly uses 225/55R17 before choosing a whitewall or redline treatment simply because the style is available.
How does tire construction affect the appearance of a restored 2021 Infiniti Q50?
Tire construction is not the major appearance dividing line on the 2021 Infiniti Q50, because the primary fitments are all radial. Visual character comes more from sidewall treatment and tire series, with most sizes presented in blackwall form and the 225/55R17 fitment adding whitewall and redline alternatives.
That makes size selection especially important for appearance-minded buyers. A Q50 on its standard 17-inch fitment gives more room for a distinctive presentation, while 18-inch and 19-inch trims keep a more contemporary look. Anyone pursuing a highly specific visual theme should also confirm the wheel design and stance before finalizing the tire choice.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2021 Infiniti Q50?
Yes, modifications can affect tire fitment on a 2021 Infiniti Q50. Aftermarket wheels, altered offsets, suspension changes, lowering, and previous tire-size substitutions can all change how well a tire works within the wheelwell, even when the replacement looks close to one of the original Q50 sizes.
That is especially important on 19-inch and staggered applications, where front and rear fitment may already be different from the factory wheel arrangement. A modified Q50 should be checked for wheel diameter, wheel width, steering clearance, and fender clearance before replacing tires based only on the model year and trim badge.
What should I inspect before driving a 2021 Infiniti Q50 on new tires?
Before driving a 2021 Infiniti Q50 on new tires, inspect tire pressure, confirm the tire size matches the wheel and axle position, and look over the wheels for damage or irregular seating. It also helps to check alignment condition, uneven wear patterns on the old tires, and any signs of rubbing at full steering lock.
A careful first inspection reduces the chance of chasing handling or wear problems that were really caused by the wheel or suspension setup. On a Red Sport 400 (RWD), make sure the staggered front and rear sizes have not been mixed, since that car depends on different tire sizes at each end.
What should I check before a longer drive in a 2021 Infiniti Q50?
Before a longer drive in a 2021 Infiniti Q50, check pressure, tread condition, sidewall condition, and any signs of cuts, bulges, or slow air loss. It is also smart to confirm that all four tires match the intended setup, particularly on cars with 19-inch wheels or on the Red Sport 400 (RWD) with staggered sizing.
Longer highway use tends to expose problems that short local trips can hide, especially if the car has sat for stretches or recently changed wheels. A quick look at wheel hardware, suspension condition, and clearance around the inner fender can help catch issues early before vibration, rubbing, or uneven wear becomes more serious.
