The 2015 Infiniti Q70L represents the long-wheelbase version of Infiniti’s full-size luxury sedan, built for buyers who wanted a more expansive cabin without stepping into a traditional limousine. On a car like this, tire fitment shapes both appearance and ride character because wheel diameter and sidewall profile change the look and stance noticeably. The 2015 Infiniti Q70L uses radial tires in two primary sizes, 245/50R18 and 245/40R20. Available choices include blackwall, redline, and raised white letter sidewall treatments across several modern radial series. The key is confirming which wheel package is on the car, then choosing a tire that suits the sedan’s presentation, intended road use, and current wheel setup.
Which Tire Size Is Right for The 2015 Infiniti Q70L
The 2015 Infiniti Q70L uses two primary tire sizes, and the first step is confirming whether the car is on 18-inch or 20-inch wheels. Both sizes are radial fitments and both appear across the covered Q70L sub-models, so the real decision is wheel diameter first, then sidewall style, tire series, and the kind of overall look you want from the finished setup.
245/50R18 is a metric radial size where 245 is the section width in millimeters, 50 is the aspect ratio, R marks radial construction, and 18 is the wheel diameter in inches. For the 2015 Infiniti Q70L, this size supports the 18-inch wheel setup while keeping a slightly taller sidewall than the 20-inch fitment. Available choices in this size include Pro-Trac Street Pro III tires with raised white letter or redline sidewall styling. It is the right size to consider when the sedan is equipped with 18-inch wheels and the goal is to stay with that original wheel diameter choice.
Tire fitment is straightforward across the covered 2015 Infiniti Q70L sub-models because both the 3.7 and 5.6 use the same two primary tire sizes. What matters most is confirming which wheel diameter is actually on the car before selecting a tire.
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2015 Infiniti Q70L 3.7
The 2015 Infiniti Q70L 3.7 uses the same two radial tire sizes found across this model line, so selection centers on whether the car is wearing 18-inch or 20-inch wheels. Once wheel diameter is confirmed, the choice shifts to sidewall presentation, tire series, and the look you want to maintain.
The 2015 Infiniti Q70L 5.6 shares the same two radial tire sizes as the 3.7, which keeps fitment simple at the sub-model level. The practical next step is verifying the current wheel setup, then comparing available tire styles and series within the correct size.
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 Q70L Tires for Sale
Available 2015 Infiniti Q70L tire choices span 245/40R20 and 245/50R18 radial fitments, with brands including BFGoodrich, Nitto, and Pro-Trac. Buyers can compare tire series and sidewall treatments such as blackwall, redline, and raised white letter while staying within the correct wheel diameter.
Common 2015 Infiniti Q70L tire questions usually come down to size selection, wheel diameter, sidewall style, and how to choose between the available radial options. The answers below focus on exact fitment, product comparison, and practical checks before the car returns to the road.
Tire Size & Fitment
What tire size fits a 2015 Infiniti Q70L?
The 2015 Infiniti Q70L uses two primary tire sizes: 245/40R20 and 245/50R18. Both are radial sizes, and both appear on the covered Q70L 3.7 and Q70L 5.6 sub-models.
The correct choice depends on the wheel diameter actually installed on the car. A Q70L with 20-inch wheels needs the 245/40R20 size, while an 18-inch wheel setup takes 245/50R18. Checking the wheel itself before ordering matters more than assuming fitment from engine designation alone.
What size rim does a 2015 Infiniti Q70L use?
The 2015 Infiniti Q70L uses either an 18-inch or 20-inch rim, depending on which of its two tire sizes is on the car. The 245/50R18 size matches an 18-inch rim, and the 245/40R20 size matches a 20-inch rim.
That rim diameter difference is the main fitment checkpoint on this model. Looking at the tire sidewall or measuring the wheel before choosing a tire prevents ordering the right section width and profile on the wrong rim diameter, which is the easiest mistake to make on a two-size application like this.
Do all 2015 Infiniti Q70L sub-models use the same tire size?
The covered 2015 Infiniti Q70L sub-models share the same tire-size choices rather than having separate sizes by engine. Both the Q70L 3.7 and Q70L 5.6 use 245/40R20 and 245/50R18 radial fitments.
That means sub-model name is less important than wheel package when selecting tires for this car. A buyer should verify whether the car is currently on 18-inch or 20-inch wheels, especially if it has changed hands or received aftermarket wheels at some point in its service life.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 Infiniti Q70L?
Start with the correct size, because the 2015 Infiniti Q70L uses either 245/50R18 or 245/40R20 depending on wheel diameter. After that, compare tire series, sidewall styling, brand, and any rim-width details that apply to the specific tire you are considering.
A shorter-profile 20-inch setup and a taller-profile 18-inch setup create different visual impressions, so the decision is partly about presentation as well as fitment. It also helps to look at the car’s current wheels, intended driving use, and whether you want a plain blackwall appearance or a more distinctive sidewall treatment.
What sidewall styles are available for 2015 Infiniti Q70L tires?
Sidewall choices for the 2015 Infiniti Q70L include blackwall, redline, and raised white letter styles, depending on the tire size and series. The 245/40R20 selection includes blackwall, redline, and raised white letter options, while the 245/50R18 choices shown here are redline and raised white letter.
That gives the Q70L owner a meaningful appearance choice even within the same basic fitment. Blackwall keeps the presentation understated, while redline or raised white letter treatments add a more customized look. Matching the sidewall style to the sedan’s wheels and overall visual theme usually matters as much as brand selection.
What brands offer tires for the 2015 Infiniti Q70L?
Available tire brands for the 2015 Infiniti Q70L include BFGoodrich, Nitto, and Pro-Trac. Brand selection varies by size, with the broader range appearing in 245/40R20 and the 245/50R18 options centered on Pro-Trac Street Pro III tires.
Brand is only one part of the comparison. It still makes sense to review the exact tire series, sidewall treatment, and wheel-diameter match before choosing between options, since two tires from different brands may serve very different visual or driving goals even when they share the same nominal size.
Restoration & Appearance
Which tire should I choose for a period-style 2015 Infiniti Q70L?
A period-style 2015 Infiniti Q70L tire choice starts with preserving the car’s actual wheel diameter, either 245/50R18 or 245/40R20. From there, the most appearance-driven choices come from the available Pro-Trac Street Pro III options, especially when a redline or raised white letter presentation suits the car’s visual direction.
Because this is a modern luxury sedan rather than a vintage factory sidewall application, the goal is usually a personalized period-inspired look instead of proving exact assembly-line originality. Wheel design, ride height, and overall finish all influence which tire style looks most natural once mounted on the car.
How does tire construction affect the appearance of a restored 2015 Infiniti Q70L?
On the 2015 Infiniti Q70L, appearance differences come more from wheel diameter, profile, and sidewall treatment than from construction choice, because the primary fitments here are radial. A 245/40R20 setup presents a shorter sidewall than a 245/50R18, and blackwall, redline, or raised white letter styling changes the character further.
That makes the visual decision fairly focused: confirm the proper wheel size, then choose the sidewall treatment that matches the car’s finish and stance. A cleaner luxury presentation may lean toward blackwall, while a more custom or enthusiast-oriented build may call for a stronger sidewall accent.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Infiniti Q70L?
Yes. Modifications such as aftermarket wheels, altered offsets, suspension changes, or ride-height adjustments can affect tire fitment on a 2015 Infiniti Q70L even when the tire size itself matches one of the standard dimensions.
A Q70L that has been lowered or fitted with different wheels should be checked for inner clearance, fender clearance, and steering travel before a new set goes into service. Confirming actual wheel diameter is especially important on this model because both 18-inch and 20-inch fitments are used.
What should I inspect before driving a 2015 Infiniti Q70L on new tires?
Before road use, inspect the wheels for damage, confirm that the tire size matches the wheel diameter, and make sure the tires are inflated properly for the vehicle’s setup. It also helps to look over the suspension and alignment condition so the new tires are not immediately compromised by existing wear issues.
A short initial drive should include listening for rubbing and checking that the tires clear the fenders and suspension through normal steering movement. Rechecking inflation and visually inspecting the tires after the first few drives is a sensible step, especially on a car that may have seen wheel changes over time.
How often should tires on a 2015 Infiniti Q70L be inspected?
Tires on a 2015 Infiniti Q70L should be inspected regularly, not just at replacement time. Routine checks should cover tread wear, cuts, punctures, sidewall damage, and signs of air loss, with extra attention if the car is driven infrequently or stored for extended periods.
Luxury sedans often hide tire issues until vibration, uneven wear, or handling changes become obvious, so periodic visual inspection is worthwhile even when mileage is low. It is also smart to inspect after pothole impacts or wheel service, since either 18-inch or 20-inch fitment can be affected by a damaged wheel.
