The 2009 Infiniti M35 sits in the era when Infiniti blended rear-drive sport-sedan character with upscale comfort and sharper, more athletic wheel-and-tire packages. Buyers looking at this exact car usually need to confirm whether it is a Luxury, X, or Sport model first, because tire fitment splits between 245/45R18 and 245/40R19 radial sizes. Both are modern metric radial fitments, but the smaller sidewall 19-inch Sport setup creates a different selection path than the 18-inch Luxury and X arrangement. Available choices center on blackwall performance-oriented tires from BFGoodrich and Nitto, so the real decision is matching the correct size and wheel diameter to the car you actually have.
Which Tire Size Is Right for The 2009 Infiniti M35
The 2009 Infiniti M35 uses two primary tire sizes, and the correct one depends on the sub-model and wheel diameter. Luxury and X models use 245/45R18 on an 18-inch rim, while the Sport uses 245/40R19 on a 19-inch rim. Before comparing tires, confirm the exact sub-model and verify the wheels currently on the car, especially if it may have been changed from stock sizing.
In 245/45R18, the 245 identifies the nominal section width in millimeters, 45 is the aspect ratio, R denotes radial construction, and 18 is the wheel diameter in inches. This is a modern radial size used on 18-inch-wheel versions of the 2009 Infiniti M35, including the Luxury and X sub-models. Available choices include blackwall tires from BFGoodrich and Nitto across g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2 lines. This size is the right starting point if the car carries the 18-inch setup and you want to compare performance-oriented radial options within the proper fitment family.
In 245/40R19, the 245 is the nominal tire width in millimeters, 40 is the aspect ratio, R indicates radial construction, and 19 refers to the wheel diameter in inches. This size belongs to the 19-inch setup used on the 2009 Infiniti M35 Sport, so it should not be treated as a universal M35 fitment. BFGoodrich offers this size in blackwall configurations through the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. It is the size to evaluate when the car is a Sport model or already wears correct 19-inch wheels that match this factory-style fitment path.
Sub-model identification matters on the 2009 Infiniti M35 because tire fitment is not the same across the range. Luxury and X models share the 18-inch tire size, while the Sport moves to a different radial size on a 19-inch wheel.
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2009 Infiniti M35 Luxury
The 2009 Infiniti M35 Luxury uses the 245/45R18 radial fitment. Tire selection here is mainly about comparing 18-inch blackwall performance tires, checking wheel width compatibility, and making sure the car still has its correct 18-inch wheel setup.
The 2009 Infiniti M35 Sport uses the 245/40R19 radial size rather than the 18-inch fitment found on other M35 versions. That makes wheel-diameter confirmation especially important before choosing among the available 19-inch blackwall performance tire options.
The 2009 Infiniti M35 X shares the 245/45R18 radial fitment with the Luxury model. The key decision is choosing among the available 18-inch product lines while confirming that the car still wears wheels sized for this fitment.
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 2009 Infiniti M35 Tires for Sale
Available 2009 Infiniti M35 tires center on 245/45R18 and 245/40R19 radial performance fitments from BFGoodrich and Nitto. The product grid lets you compare blackwall options across g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2 lines, along with rim-width and load-capacity details where applicable.
These FAQs focus on the exact tire sizes used on the 2009 Infiniti M35, how fitment changes between Luxury, Sport, and X models, and what to check when comparing wheel size, tire choice, and road-use readiness.
Tire Size & Fitment
What tire size fits a 2009 Infiniti M35?
The 2009 Infiniti M35 uses two tire sizes depending on sub-model. The M35 Luxury and M35 X use 245/45R18 radial tires, while the M35 Sport uses 245/40R19 radial tires. Both are modern metric radial sizes, but they are tied to different wheel diameters and should not be treated as interchangeable primary fitments.
The first step is confirming whether the car is a Luxury, Sport, or X model, then checking the actual wheel diameter on the car. On a used M35, wheel changes are common enough that the current setup deserves a quick inspection before selecting tires by size alone.
What size rim does a 2009 Infiniti M35 use?
A 2009 Infiniti M35 uses either an 18-inch or 19-inch rim, depending on sub-model. The Luxury and X models use the 245/45R18 size on an 18-inch wheel, while the Sport uses 245/40R19 on a 19-inch wheel. The tire size itself tells you the wheel diameter because the final number in each size is the rim size in inches.
Wheel diameter is the most important fitment checkpoint on this car because the two tire sizes are split across different wheel packages. It also helps to confirm wheel width before comparing products, since the available tires carry rim-width ranges that should match the wheels currently installed.
Do all 2009 Infiniti M35 sub-models use the same tire size?
No. The 2009 Infiniti M35 Luxury and M35 X share the 245/45R18 radial size, but the 2009 Infiniti M35 Sport uses 245/40R19. That means tire choice changes with the sub-model, and the Sport follows a separate 19-inch fitment path from the other two versions.
This matters because selecting by model name alone can lead to the wrong wheel diameter and the wrong tire. Checking the trim badge, wheel size, and current tire sidewall marking will usually settle the question quickly, especially on cars that may have seen wheel or suspension changes over time.
Choosing the Right Tire
What should I consider when choosing a tire for a 2009 Infiniti M35?
Start with the correct size for the exact sub-model: 245/45R18 for the Luxury and X, or 245/40R19 for the Sport. From there, compare radial tire series, wheel-width compatibility, and any load-capacity details that matter to the way the car is driven. On this M35, the available products are all blackwall performance-oriented radials.
A good comparison should also include the actual wheel setup on the car and whether the goal is routine road use, a sportier feel, or simply staying with the correct fitment family. Looking at the tire's approved rim-width range is especially useful if the car no longer wears its original wheels.
What sidewall styles are available for 2009 Infiniti M35 tires?
The available 2009 Infiniti M35 tires in these fitment sizes use a blackwall sidewall style. That applies to the 245/45R18 and 245/40R19 product selections, which are centered on modern radial performance tires rather than whitewall, redline, or other appearance-driven vintage sidewall treatments.
For most M35 buyers, that means the selection process is less about sidewall appearance and more about choosing the right size, wheel compatibility, and tire series. If appearance still matters, blackwall keeps the presentation clean and contemporary, which suits the M35's original luxury-sport character well.
What brands offer tires for the 2009 Infiniti M35?
The available tire choices for the 2009 Infiniti M35 come from BFGoodrich and Nitto. In 245/45R18, both brands are represented, while the 245/40R19 fitment shown here centers on BFGoodrich offerings. Series names include g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and Nitto NT555 G2.
Brand choice should still come after confirming the correct size and wheel diameter for the car. Once that is settled, compare each tire by series character, rim-width range, load details where stated, and whether the tire matches the way the M35 will actually be used on the road.
Restoration & Appearance
Which tire should I choose for a period-style 2009 Infiniti M35?
A period-style approach for a 2009 Infiniti M35 starts with keeping the correct modern radial size for the sub-model rather than moving to an unrelated fitment. That means 245/45R18 for the Luxury and X, or 245/40R19 for the Sport. The available blackwall radial options also suit the M35's original luxury-sport era presentation.
Because this is a newer enthusiast-era sedan, appearance usually comes from preserving the correct wheel-and-tire proportion rather than choosing a vintage-style sidewall. If originality is especially important, compare the current setup with factory literature or marque-specific references before replacing wheels or changing tire size.
Does correct tire fitment matter for a 2009 Infiniti M35 restoration?
Yes. Correct tire fitment helps preserve the intended stance, wheel proportion, and overall character of a 2009 Infiniti M35. Since the model splits between 18-inch and 19-inch packages, using the right size for the exact sub-model is a basic part of keeping the car visually and mechanically in the proper range.
Restoration-minded owners should pay attention not only to the tire size but also to whether the car still has the correct wheel diameter and width. Even on a more modern collector vehicle, mismatched wheels or altered tire sizing can change the look enough to move the car away from its original design intent.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Infiniti M35?
Yes. A 2009 Infiniti M35 can be affected by aftermarket wheels, suspension changes, lowering, altered offsets, or body modifications, even when the tire size itself looks close to the original fitment. That is especially important here because the car already has two legitimate factory-style size paths tied to different wheel diameters.
A modified M35 should be checked for actual wheel diameter, wheel width, and clearance at the fender and steering components before new tires are chosen. Looking at the current tire sidewall alone is not enough if the car has changed from its original Luxury, X, or Sport wheel package.
What should I inspect before driving a 2009 Infiniti M35 on new tires?
Before putting a 2009 Infiniti M35 back on the road with new tires, inspect wheel condition, verify the tire size matches the sub-model, and confirm that inflation is set correctly for the tire and vehicle setup. It is also wise to look over alignment-related wear items, especially if the old tires showed uneven tread wear.
A short check of suspension condition, brake clearance, and steering travel can prevent surprises after installation. The first miles on new tires are also a good time to listen for rubbing, feel for vibration, and recheck air pressure once the tires have settled into regular road use.
How often should tires on a 2009 Infiniti M35 be inspected?
Tires on a 2009 Infiniti M35 should be inspected regularly, not just when tread looks low. A routine visual check for cracking, punctures, sidewall damage, uneven wear, and pressure loss is a smart habit, especially on a performance-oriented luxury sedan that may be driven less frequently than a daily commuter.
Monthly pressure checks and a closer inspection before longer trips help catch problems early. Age also matters on lower-use cars, so an M35 that spends long periods parked still deserves attention for hardening rubber, flat spotting, and general condition even if the tread depth appears acceptable.
