The 2018 Infiniti Q50 sits in the modern sport-luxury sedan space, blending sharp styling with rear-drive sport-sedan character and available AWD or hybrid powertrains. Tire selection on this car is closely tied to the exact trim and wheel package, with radial fitments ranging from 17-inch and 18-inch sizes up to 19-inch performance applications, including a staggered setup on the Red Sport 400 RWD. Available choices lean toward blackwall performance radials, while select 17-inch options also open the door to wide whitewall or redline styling. The right decision starts with confirming the exact sub-model, then matching the tire to the car's wheel diameter, intended use, and overall presentation.
Which Tire Size Is Right for The 2018 Infiniti Q50
The 2018 Infiniti Q50 uses four primary tire sizes, and the right one depends on the exact sub-model and wheel setup. All of them are radial fitments, but the car spans 17-inch, 18-inch, and 19-inch rims, with one 19-inch staggered rear application on the Red Sport 400 RWD. Confirming the sub-model and wheel diameter comes first, since that determines whether you need a standard square setup or a front-to-rear split performance fitment.
Fit(s): Hybrid Luxe (AWD), Hybrid Luxe (RWD), Red Sport 400 (AWD), Red Sport 400 (RWD) Front, Sport (AWD), and Sport (RWD)
Construction: Radial|Rim: 19 in
A 245/40R19 tire uses a 245-millimeter section width, a 40-series aspect ratio, radial construction, and a 19-inch rim. On the 2018 Infiniti Q50, this size serves several higher-spec configurations and supports the car's sport-oriented stance and steering response. Available choices center on BFGoodrich performance-oriented radial lines, all in blackwall form, with series including g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A. This size is the one to evaluate when the car already carries the correct 19-inch wheel package and the goal is to stay with a modern performance presentation.
A 225/50R18 tire combines a 225-millimeter section width with a 50-series profile on an 18-inch radial tire. On the 2018 Infiniti Q50, this size is used on the Luxe model and represents a middle ground between the larger 19-inch sport fitments and the 17-inch applications. Product choices include BFGoodrich blackwall radial options across the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. This is the size to focus on when the car wears 18-inch wheels and the priority is preserving the intended fitment rather than moving to a different wheel diameter.
A 225/55R17 tire uses a 225-millimeter section width, a 55-series sidewall profile, radial construction, and a 17-inch rim. On the 2018 Infiniti Q50, this size appears on Pure models and offers the broadest appearance range among the available fitments. Along with BFGoodrich g-Force blackwall performance radials, this size is also offered in Silvertown Radial versions with wide whitewall or redline sidewall styling. It is the right size to review when the car has 17-inch wheels and you want to balance correct basic fitment with either a contemporary blackwall look or a more customized visual treatment.
A 265/35R19 tire is a wider 265-millimeter radial with a lower 35-series profile for a 19-inch rim. On the 2018 Infiniti Q50, this size is used as the rear tire on the staggered Red Sport 400 RWD setup rather than as a universal fitment across the model line. Available blackwall choices include BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Phenom T/A, and the Nitto NT555 G2. This size should be matched carefully to the correct rear-wheel application, especially when confirming that the car still retains its intended staggered wheel and tire arrangement.
Sub-model fitment matters on the 2018 Infiniti Q50 because tire size changes with trim, drivetrain, and in one case front-to-rear position. Some versions share the same size, but the first step is still confirming the exact sub-model and wheel setup before comparing tires.
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2018 Infiniti Q50 Hybrid Luxe (AWD)
The 2018 Infiniti Q50 Hybrid Luxe (AWD) uses a 245/40R19 radial fitment. Tire selection here is mainly about choosing among blackwall performance-oriented 19-inch options that suit the car's existing wheel package and intended road use.
The 2018 Infiniti Q50 Hybrid Luxe (RWD) also uses a 245/40R19 radial tire. That keeps the decision centered on brand and tire-series differences rather than on changing sizes, as long as the car still wears the correct 19-inch wheels.
The 2018 Infiniti Q50 Luxe uses a 225/50R18 radial tire. This places the focus on selecting the right 18-inch blackwall performance-style option and confirming that the car has not been changed to a different wheel diameter since new.
The 2018 Infiniti Q50 Pure (AWD) uses the 225/55R17 radial size. This fitment opens up both blackwall performance choices and select appearance-driven sidewall options, so the decision can include both driving use and visual style.
The 2018 Infiniti Q50 Pure (RWD) shares the 225/55R17 radial fitment with the AWD version. That means the main decision is not size but which 17-inch tire best matches the car's use, look, and wheel compatibility.
The 2018 Infiniti Q50 Red Sport 400 (AWD) uses a 245/40R19 radial tire. Tire choice stays within the 19-inch blackwall performance category, with attention paid to maintaining the correct wheel fitment and overall handling character.
The front fitment on the 2018 Infiniti Q50 Red Sport 400 (RWD) is 245/40R19. That front size must be considered together with the wider rear tire so the car keeps its intended staggered setup instead of being treated like a square four-corner arrangement.
The rear fitment on the 2018 Infiniti Q50 Red Sport 400 (RWD) is 265/35R19. This wider rear size calls for careful confirmation of wheel position and rear wheel specifications before selecting among the available blackwall performance radial choices.
The 2018 Infiniti Q50 Sport (AWD) uses a 245/40R19 radial fitment. Selection is straightforward once the 19-inch wheel setup is confirmed, with the remaining choice centered on tire series and performance-oriented product character.
The 2018 Infiniti Q50 Sport (RWD) also uses a 245/40R19 radial tire. That makes this sub-model a matter of choosing the right 19-inch blackwall tire for the existing wheel package rather than sorting through multiple primary sizes.
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 2018 Infiniti Q50 Tires for Sale
Available 2018 Infiniti Q50 tires focus on modern radial performance options, primarily from BFGoodrich, with Nitto also appearing in 265/35R19. Buyers can compare blackwall g-Force and Phenom series across several sizes, while 225/55R17 also adds Silvertown Radial choices in wide whitewall and redline.
The most common 2018 Infiniti Q50 tire questions center on sub-model sizing, 17-inch versus 18-inch or 19-inch wheel fitment, staggered Red Sport setups, sidewall choices, and what to inspect before putting a modern sport sedan back on the road.
Tire Size & Fitment
What tire size fits a 2018 Infiniti Q50?
The 2018 Infiniti Q50 uses four primary tire sizes: 225/55R17, 225/50R18, 245/40R19, and 265/35R19. The exact size depends on the sub-model and wheel package, with the Red Sport 400 RWD using a staggered setup that combines 245/40R19 in front with 265/35R19 in the rear.
The key is matching the tire to the car's actual trim and wheel diameter rather than assuming every Q50 uses the same size. Looking at the current wheel setup first helps prevent ordering a 17-inch, 18-inch, or 19-inch tire for the wrong version of the car.
What size rim does a 2018 Infiniti Q50 use?
A 2018 Infiniti Q50 may use 17-inch, 18-inch, or 19-inch rims, depending on the sub-model. The 225/55R17 size mounts on a 17-inch rim, 225/50R18 uses an 18-inch rim, and both 245/40R19 and 265/35R19 are built for 19-inch rims.
Wheel diameter should be confirmed before anything else because the Q50 does not use one universal rim size across the model range. On cars that have been upgraded with aftermarket wheels, checking the wheel markings and the tire size already mounted is the safest starting point.
Why does the 2018 Infiniti Q50 have more than one tire size?
The 2018 Infiniti Q50 uses different tire sizes because trim level, drivetrain, and sport-oriented wheel packages change the fitment. Pure models use 225/55R17, the Luxe uses 225/50R18, several sport and hybrid trims use 245/40R19, and the Red Sport 400 RWD adds a wider 265/35R19 rear tire.
That means tire selection starts with identifying the exact version of the car, not just the year and model name. A wider rear tire on the staggered Red Sport setup also means front and rear positions should be checked separately rather than rotated into a one-size-fits-all purchase.
Choosing the Right Tire
What should I consider when choosing a 2018 Infiniti Q50 tire?
Start with the correct size for the exact 2018 Infiniti Q50 sub-model, then compare tire construction, wheel diameter, and the character of the available product lines. All primary Q50 fitments here are radial, but the choices still vary by series, rim-width compatibility, weight, and in some cases load information.
Appearance also matters more on some setups than others. The 17-inch 225/55R17 fitment offers blackwall, wide whitewall, and redline choices, while the 18-inch and 19-inch sizes stay more performance-oriented and blackwall-focused, so the best match depends on whether the goal is stock-style use or a more personalized look.
What sidewall styles are available for 2018 Infiniti Q50 tires?
Most available 2018 Infiniti Q50 tire options use a blackwall sidewall, especially in the 18-inch and 19-inch fitments. The 225/55R17 size adds more visual variety with Silvertown Radial offerings in wide whitewall and redline, giving that particular Q50 fitment a broader styling range than the others.
That makes sidewall choice especially important on Pure models using 225/55R17. A blackwall keeps a more contemporary presentation, while wide whitewall or redline options create a custom look that changes the car's visual character without changing the primary tire size or wheel diameter.
What brands offer tires for the 2018 Infiniti Q50?
BFGoodrich appears across all four 2018 Infiniti Q50 tire sizes, covering g-Force performance lines, g-Force Phenom T/A, and select Silvertown Radial options in 225/55R17. Nitto is also available in the 265/35R19 rear size used on the Red Sport 400 RWD staggered setup.
Brand choice should still be secondary to getting the right size and wheel match for the specific Q50 configuration. Once the fitment is confirmed, comparing the available series within that size helps narrow the selection by intended use, visual preference, and the product specifications that matter to your wheel setup.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Infiniti Q50?
A period-style approach on a 2018 Infiniti Q50 still starts with the correct modern radial size for the exact trim. Among the available fitments, 225/55R17 offers the broadest appearance options because it includes blackwall performance-style choices as well as Silvertown Radial versions with wide whitewall or redline sidewalls.
That does not make those appearance treatments original to every Q50, but it does give a custom or nostalgia-inspired direction within the proper basic size. Buyers aiming for a highly exact visual presentation should compare the tire choice against photos, original literature, and marque-specific references before deciding.
How does tire construction affect the appearance of a restored 2018 Infiniti Q50?
For the 2018 Infiniti Q50, primary fitment remains straightforward because the applicable sizes are radial tires. The visual differences come less from switching construction types and more from tire series, shoulder shape, tread presentation, and especially sidewall treatment in the 225/55R17 size.
A blackwall usually keeps the car closer to a contemporary sport-sedan appearance, while redline or wide whitewall sidewalls create a more personalized statement. Since this is a modern vehicle rather than a mid-century restoration candidate, appearance choices tend to be about style direction more than strict historical authenticity.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Infiniti Q50?
Yes. Modifications such as aftermarket wheels, altered offsets, suspension changes, lowering, or changes to front and rear wheel widths can affect tire fitment on a 2018 Infiniti Q50. That matters even more on the Red Sport 400 RWD, where the factory-style arrangement already uses different front and rear tire sizes.
Any change to wheel or suspension hardware should be checked for fender clearance, inner clearance, and steering travel before selecting tires. A Q50 that no longer uses its original wheel package may still need the same rim diameter, but width and fitment details can change the range of suitable tire choices.
What should I inspect before driving a 2018 Infiniti Q50 on new tires?
Before driving a 2018 Infiniti Q50 on new tires, inspect wheel condition, valve stems, and the suspension and steering parts that influence alignment and clearance. The tires themselves should be checked for proper inflation, bead seating, visible damage, and correct placement if the car uses a staggered front-to-rear setup.
A short test drive should include attention to rubbing, vibration, and pull, especially after moving between 17-inch, 18-inch, and 19-inch wheel packages or replacing only part of a staggered set. Rechecking air pressure after installation helps confirm that the tires are settling in properly for regular road use.
How often should tires on a 2018 Infiniti Q50 be inspected?
Tires on a 2018 Infiniti Q50 should be inspected regularly for air loss, uneven wear, cuts, punctures, bulges, and sidewall damage. Even on a modern sedan, low annual mileage can hide age-related issues, so occasional-use vehicles still benefit from routine visual checks instead of relying only on tread depth.
A practical habit is to inspect them before longer drives and any time the car has been parked for an extended period. On staggered Q50 setups, front and rear tires may wear differently, so each axle deserves separate attention rather than assuming the whole set is aging the same way.
