The 2017 Infiniti Q70L sits in the full-size luxury sport sedan category with extra rear-seat length, so tire choice has to balance the car’s upscale road manners with the wheel setup actually on the vehicle. This is a modern Infiniti, not a vintage fitment exercise, but exact sizing still matters because the Q70L uses two radial sizes: 245/50R18 and 245/40R20. That means the first step is confirming whether the car is on 18-inch or 20-inch wheels. From there, the decision shifts to sidewall style, tire series, and whether the owner wants a straightforward blackwall performance look or a more distinctive raised white letter or redline presentation.
Which Tire Size Is Right for The 2017 Infiniti Q70L
The 2017 Infiniti Q70L uses two primary tire sizes, and the difference comes down first to wheel diameter. Both are radial metric sizes, but one fits an 18-inch rim and the other fits a 20-inch rim, so confirming the wheels on the car is the key step before comparing tires. Once that is settled, the real choice becomes tire style, series, and the kind of appearance you want from the available options.
A 245/40R20 tire uses a 245-millimeter section width, a 40-series aspect ratio, radial construction, and a 20-inch rim diameter. On the 2017 Infiniti Q70L, this size supports the larger-wheel setup and keeps the fitment in a modern radial format familiar to late-model luxury and sport sedans. Available choices include BFGoodrich, Nitto, and Pro-Trac, with blackwall, raised white letter, and redline sidewall treatments across series such as g-Force Comp 2 AS, g-Force Phenom T/A, NT555 G2, and Street Pro III. This size is the one to evaluate when the car already carries 20-inch wheels and you want to compare both performance-oriented and appearance-driven options.
A 245/50R18 tire uses the same 245-millimeter section width as the 20-inch option, but with a taller 50-series profile on an 18-inch rim. For the 2017 Infiniti Q70L, it represents the alternate factory-size wheel diameter, so it should be chosen only after confirming that the car is equipped with 18-inch wheels. Current choices in this size center on the Pro-Trac Street Pro III radial line, with raised white letter and redline sidewall styles available. This fitment makes the most sense for owners who are matching an 18-inch wheel setup and want a more tailored sidewall appearance rather than a broad mix of brands.
Tire fitment is straightforward across the covered 2017 Infiniti Q70L sub-models because both share the same two primary tire sizes. The important check is not engine designation, but whether the car is riding on 18-inch or 20-inch wheels before choosing a tire.
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2017 Infiniti Q70L 3.7
The 2017 Infiniti Q70L 3.7 uses the same two radial tire sizes found across this model line, so the deciding factor is the wheel diameter on the car. Tire selection then becomes a matter of matching the correct 18-inch or 20-inch setup and choosing among the available sidewall and series options.
The 2017 Infiniti Q70L 5.6 follows the same fitment pattern, with both primary radial sizes applying depending on wheel choice. That means owners should confirm whether the vehicle has 18-inch or 20-inch rims first, then compare the available tire styles and product lines within that exact 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 2017 Infiniti Q70L Tires for Sale
Available 2017 Infiniti Q70L tires cover both primary sizes with radial options from BFGoodrich, Nitto, and Pro-Trac. The product grid is most useful for comparing 18-inch versus 20-inch fitment, blackwall versus raised white letter or redline sidewalls, and differences between g-Force, NT555 G2, and Street Pro III series.
These FAQs focus on the exact tire sizes used on the 2017 Infiniti Q70L, how wheel diameter affects fitment, and how to compare available radial tires by brand, sidewall style, appearance, and road-use considerations.
Tire Size & Fitment
What tire size fits a 2017 Infiniti Q70L?
The 2017 Infiniti Q70L uses two primary tire sizes: 245/40R20 and 245/50R18. Both are radial metric sizes, and both appear across the Q70L lineup, including the 3.7 and 5.6 sub-models. The actual size for a specific car depends on which wheel diameter is installed.
That means the first job is checking the wheel itself rather than assuming the engine version determines tire size. A Q70L on 18-inch rims needs 245/50R18, while a Q70L on 20-inch rims needs 245/40R20. Looking at the current tire sidewall or measuring the wheel diameter is the simplest way to confirm the correct fitment before comparing products.
What size rim does a 2017 Infiniti Q70L use?
A 2017 Infiniti Q70L uses either an 18-inch or 20-inch rim, depending on the tire size on the car. The 245/50R18 size fits an 18-inch wheel, and the 245/40R20 size fits a 20-inch wheel. Both rim diameters are part of the Q70L fitment range.
Wheel diameter needs to be confirmed before choosing a tire because the two sizes are not interchangeable across different rims. If the car has already been changed from its original wheel setup, checking the stamped wheel size or reading the existing tire sidewall will prevent ordering the wrong diameter. Width and clearance should also be reviewed if aftermarket wheels are involved.
Do all 2017 Infiniti Q70L sub-models use the same tire size?
The 2017 Infiniti Q70L 3.7 and 2017 Infiniti Q70L 5.6 share the same two primary tire sizes: 245/40R20 and 245/50R18. Both sub-models use radial tires, so there is no separate construction choice tied to one engine or the other. The main difference is wheel diameter, not sub-model name.
That makes fitment simpler than on vehicles where each trim has a unique size, but the exact wheel setup still matters. Before selecting a tire, verify whether the car is currently on 18-inch or 20-inch rims and check that the wheels have not been replaced with aftermarket pieces. Once the diameter is confirmed, product choice comes down to brand, sidewall style, and tire series.
Choosing the Right Tire
What should I consider when choosing a 245/40R20 tire for a 2017 Infiniti Q70L?
Start with the basics: the tire must be 245/40R20 and it must match the 20-inch wheel setup on the car. Within that size, the available radial choices vary by brand, tire series, sidewall style, rim-width specification, weight, and in some cases load information. BFGoodrich, Nitto, and Pro-Trac are all represented in this size.
After size is confirmed, the decision becomes more about the kind of tire presentation and use you want. A blackwall option keeps a cleaner late-model look, while raised white letter or redline versions create a more custom appearance. If the Q70L has non-stock wheels or suspension changes, compare wheel width and check fender and steering clearance before settling on a tire.
What sidewall styles are available for 2017 Infiniti Q70L tires?
Sidewall choices for the 2017 Infiniti Q70L include Blackwall, RWL, and Redline depending on tire size and product line. The 245/40R20 size has the widest variety, with blackwall options from BFGoodrich and Nitto plus raised white letter and redline versions from Pro-Trac. The 245/50R18 size is available with raised white letter and redline styling.
That variety lets the owner decide whether the car should keep a modern understated appearance or lean into a more distinctive custom look. Sidewall style does not change the required tire size, so the correct wheel diameter still comes first. Once the fitment is confirmed, sidewall treatment becomes one of the easiest ways to tailor the Q70L’s visual character.
What brands offer tires for the 2017 Infiniti Q70L?
Tires for the 2017 Infiniti Q70L are available from BFGoodrich, Nitto, and Pro-Trac. The 245/40R20 size offers the broadest brand mix, while the 245/50R18 size is represented by Pro-Trac Street Pro III options. All of the available choices for this vehicle are radial tires.
Brand choice should be considered alongside the exact size, wheel diameter, sidewall style, and tire series rather than treated as the only decision point. Some owners will want a straightforward blackwall look, while others may prefer raised white letter or redline styling. Comparing the product details within the correct size usually gives a clearer picture than choosing by brand name alone.
Restoration & Appearance
Which tire should I choose for a period-style 2017 Infiniti Q70L?
A period-style approach on a 2017 Infiniti Q70L starts with keeping the exact wheel diameter and tire size already appropriate to the car: either 245/50R18 or 245/40R20. Because this is a modern luxury sedan, the most faithful visual direction usually comes from staying within the correct radial size and choosing a sidewall treatment that suits the car’s overall presentation.
For a restrained late-model look, a blackwall tire is the natural place to start, especially in 245/40R20 where several blackwall performance-oriented options exist. Owners who want a more customized appearance can consider raised white letter or redline versions. The safest visual choice is the one that preserves proper size and wheel compatibility before focusing on styling details.
How does tire construction affect the appearance of a restored 2017 Infiniti Q70L?
On the 2017 Infiniti Q70L, construction does not create a bias-ply versus radial decision because the applicable fitments are radial. That means the visual impact comes less from construction type and more from the tire’s profile, wheel diameter, and sidewall style. A 245/50R18 and a 245/40R20 can give the car noticeably different visual balance because they are tied to different wheel sizes.
Appearance changes most when the owner moves from a plain blackwall tire to raised white letter or redline styling. The 20-inch size offers all three looks, while the 18-inch size is centered on raised white letter and redline options. Keeping the tire in the correct size for the wheel is what preserves a cohesive, intentional look on the Q70L.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 Infiniti Q70L?
Yes, modifications can affect tire fitment on a 2017 Infiniti Q70L even when the tire size itself is one of the correct factory fitments. Aftermarket wheels, changes in wheel width, altered offset, lowering springs, suspension work, or body modifications can all influence how a 245/40R20 or 245/50R18 sits in the wheel opening.
That is why a modified Q70L should be checked for steering clearance, fender clearance, and overall wheel compatibility before a new set of tires is chosen. A size that suits one car may create issues on another if the wheel package has changed. Reviewing the current wheel dimensions and suspension setup is especially important when replacing only two tires or changing styles.
What should I inspect before driving a 2017 Infiniti Q70L on new tires?
Before driving a 2017 Infiniti Q70L on new tires, inspect the wheel diameter and confirm the tire size matches the rim: 245/50R18 for 18-inch wheels or 245/40R20 for 20-inch wheels. It also makes sense to verify proper inflation, look for any visible wheel damage, and make sure the tires are seated and mounted correctly.
A short road test should be followed by another quick check for air loss, rubbing, vibration, or uneven clearance at full steering lock. Tire condition is only part of the equation on a luxury sedan like the Q70L, because worn suspension parts or alignment issues can affect how a fresh set performs. Catching those problems early helps protect the new tires from irregular wear.
How often should tires on a 2017 Infiniti Q70L be inspected?
Tires on a 2017 Infiniti Q70L should be inspected regularly, not just when tread looks low. A routine visual check for pressure loss, cuts, punctures, bulges, and uneven wear is a good habit, and it is especially useful on a vehicle that may run lower-profile 245/40R20 tires where wheel and sidewall impacts are easier to miss.
Inspection should also happen whenever the car has hit a pothole, curb, or road debris, or any time ride quality changes. Looking at the tires while the steering is turned can reveal clearance or wear issues that are easy to miss straight on. Consistent checks help confirm that the Q70L’s tire size, wheel setup, and alignment are still working together properly.
