The 2013 Infiniti M56 sits in the modern performance-luxury sedan space, blending V8 power with the clean, understated shape that defined Infiniti’s upper-range cars of the period. It is a car that rewards owners who pay close attention to wheel and tire setup, because this exact model uses two different primary radial tire sizes depending on sub-model. Base and X models use 245/50R18, while Sport and X Sport models use 245/40R20. That split also changes the look of the car, with available choices ranging from blackwall performance radials to RWL and redline treatments. The right tire starts with confirming the exact sub-model and wheel diameter already on the car.
Which Tire Size Is Right for The 2013 Infiniti M56
The 2013 Infiniti M56 uses two primary tire sizes, and the correct one depends on sub-model and wheel diameter. Base and X models use an 18-inch radial setup, while Sport and X Sport models use a 20-inch radial setup. Before comparing brands, sidewall styles, or tire series, the first step is confirming whether the car is equipped with the 18-inch or 20-inch wheel package.
A 245/50R18 tire uses a 245-millimeter section width, a 50-series aspect ratio, radial construction, and an 18-inch rim. On the 2013 Infiniti M56, this size is the primary fitment for sub-models built around the 18-inch wheel package, giving the buyer a modern radial format that is familiar and easy to identify. Available choices in this size include Pro-Trac Street Pro III options with either RWL or redline sidewall styling. This size is the one to evaluate when the car retains its 18-inch setup and the goal is to balance correct fitment with appearance preference.
A 245/40R20 tire keeps the same 245-millimeter nominal width but uses a lower 40-series profile on a 20-inch rim. For the 2013 Infiniti M56, this size belongs to the Sport-oriented 20-inch wheel fitment and carries a more performance-focused presentation. Product choices include blackwall tires from BFGoodrich and Nitto, along with Pro-Trac Street Pro III options in RWL and redline sidewall styles. This is the size to review when the car has the factory-style 20-inch configuration or when appearance and handling character are being considered within that wheel diameter.
Sub-model fitment matters on the 2013 Infiniti M56 because tire size changes with the wheel package. Base and X models share one size, while Sport and X Sport models share another, so identifying the exact trim is the first step before comparing tire options.
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2013 Infiniti M56 Base
The 2013 Infiniti M56 Base uses the 245/50R18 radial tire size. That keeps the decision centered on choosing the right 18-inch tire style for the car, including whether an RWL or redline presentation better suits its overall look.
The 2013 Infiniti M56 Sport uses the 245/40R20 radial tire size. Tire selection here starts with confirming the 20-inch wheel setup, then comparing blackwall, RWL, and redline options that match the car’s lower-profile fitment.
The 2013 Infiniti M56 X uses the 245/50R18 radial tire size, matching the standard 18-inch fitment. The main choice is not between different primary sizes, but between available tire styles and how the finished look fits the character of the car.
The 2013 Infiniti M56 X Sport uses the 245/40R20 radial tire size. That makes wheel diameter confirmation especially important, followed by a comparison of 20-inch tire choices with different sidewall treatments and performance-oriented series.
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 2013 Infiniti M56 Tires for Sale
Available 2013 Infiniti M56 tire choices center on 245/50R18 and 245/40R20 radial fitments, with BFGoodrich, Nitto, and Pro-Trac represented across several series. Buyers can compare blackwall, RWL, and redline sidewall treatments depending on sub-model and wheel diameter.
Owners of a 2013 Infiniti M56 usually need to sort out sub-model tire size first, then compare wheel diameter, sidewall style, and tire series. These FAQs focus on exact fitment, product choice, and the checks that matter before road use.
Tire Size & Fitment
What tire size fits a 2013 Infiniti M56?
The 2013 Infiniti M56 uses two tire sizes depending on sub-model. Base and X models use 245/50R18 radial tires, while Sport and X Sport models use 245/40R20 radial tires. Both are modern metric radial sizes, but they are tied to different wheel diameters and trim configurations.
The practical step is confirming the exact sub-model and the actual wheel size on the car before ordering tires. A modified M56 may no longer have its original wheels, so checking the sidewall size already installed and verifying the wheel diameter helps keep the replacement search on the right track.
What size rim does a 2013 Infiniti M56 use?
A 2013 Infiniti M56 uses either an 18-inch or 20-inch rim, depending on sub-model. The Base and X use the 245/50R18 size on an 18-inch rim, while the Sport and X Sport use the 245/40R20 size on a 20-inch rim. Rim diameter is part of the tire size itself, so it must match exactly.
That makes wheel confirmation more important than appearance alone when replacing tires. Even though both sizes are 245 millimeters wide in nominal section width, an 18-inch tire cannot be mounted on a 20-inch wheel, and a 20-inch tire cannot be mounted on an 18-inch wheel.
Do all 2013 Infiniti M56 sub-models use the same tire size?
No. The 2013 Infiniti M56 splits its tire fitment by sub-model. Base and X models use 245/50R18, while Sport and X Sport models use 245/40R20. The difference is not just profile height; it also reflects a change from an 18-inch wheel package to a 20-inch wheel package.
That distinction matters because tire selection starts with the exact version of the car, not just the model name. Owners should confirm whether the car is a Base, Sport, X, or X Sport, then check that the current wheels match that setup before narrowing choices by brand, sidewall style, or tire series.
Choosing the Right Tire
What should I consider when choosing a 2013 Infiniti M56 tire?
Start with the correct size for the sub-model: 245/50R18 for Base and X, or 245/40R20 for Sport and X Sport. From there, compare radial construction, wheel diameter, available sidewall style, brand, and tire series. The 20-inch fitment also includes products with stated rim-width guidance and a published load figure on one BFGoodrich option.
Once the size is confirmed, the real choice becomes how the car is used and how you want it to look. A blackwall performance tire gives a different presentation than an RWL or redline tire, and the final decision should also account for wheel compatibility and the overall setup already on the car.
What sidewall styles are available for 2013 Infiniti M56 tires?
Sidewall choices for the 2013 Infiniti M56 include blackwall, RWL, and redline, depending on tire size and product line. The 245/50R18 size is available with RWL and redline styling in the Pro-Trac Street Pro III series. The 245/40R20 size adds blackwall options from BFGoodrich and Nitto alongside Pro-Trac RWL and redline choices.
That gives owners some visual flexibility without stepping outside the correct primary tire size for the car. A blackwall look tends to suit a more understated modern appearance, while RWL and redline sidewalls create a stronger visual statement that may matter more on a sport-oriented or personalized build.
What brands offer tires for the 2013 Infiniti M56?
The 2013 Infiniti M56 has available tire choices from Pro-Trac, BFGoodrich, and Nitto. Pro-Trac appears in both 245/50R18 and 245/40R20 through the Street Pro III series, while BFGoodrich and Nitto are part of the 245/40R20 fitment. That makes brand choice broader on the Sport and X Sport wheel package.
Brand alone should not be the only filter, though. It helps to compare the exact series, sidewall treatment, and wheel specifications tied to the size your M56 uses. Keeping the correct tire size and rim diameter in place is the foundation, then brand and appearance choices can narrow the field further.
Restoration & Appearance
Which tire should I choose for a period-style 2013 Infiniti M56?
A period-style choice for a 2013 Infiniti M56 starts with keeping the correct sub-model size in place. That means 245/50R18 for Base and X models or 245/40R20 for Sport and X Sport models. Within those sizes, the available sidewall treatment has the biggest effect on appearance, especially when comparing blackwall, RWL, and redline options.
For a cleaner modern luxury-sedan presentation, many owners will focus on blackwall tires where that style is available. For a more customized or enthusiast-oriented look, RWL or redline can shift the car’s visual character noticeably, but the tire still needs to match the proper wheel diameter and sub-model fitment.
How does tire construction affect the appearance of a restored 2013 Infiniti M56?
On a 2013 Infiniti M56, construction is straightforward because the primary fitments are radial. That means the visible difference comes less from bias-ply versus radial construction and more from profile and sidewall treatment. The Base and X use the taller 245/50R18 profile, while the Sport and X Sport use the lower-profile 245/40R20 layout.
Those differences influence stance and overall character even before brand is considered. A lower-profile 20-inch setup naturally reads as more aggressive, while the 18-inch setup looks more understated. Sidewall choices such as blackwall, RWL, or redline then fine-tune the appearance within the correct size for the specific sub-model.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2013 Infiniti M56?
Yes. A 2013 Infiniti M56 that has aftermarket wheels, suspension changes, or altered ride height may need closer fitment checks even when using one of the correct primary tire sizes. The car already has two factory wheel diameters across the model range, so modifications can add another layer to the tire selection process.
Owners should verify actual wheel diameter, wheel width, and available clearance at the fender, suspension, and steering components before changing tires. That is especially important if the car no longer carries its original trim-specific wheel package, because the correct size on paper may not match the hardware currently installed.
What should I inspect before driving a 2013 Infiniti M56 on new tires?
Before road use, inspect the wheel condition, valve stems, tire pressure, and the basic condition of the suspension and alignment-related components. It also helps to confirm that all four tires match the intended size for the sub-model and that each tire is seated properly on the correct rim diameter.
A short check for rubbing or clearance issues is wise any time the car has different wheels than expected, especially on the 20-inch Sport fitment. After the first drives, recheck pressure and look for any signs of uneven contact, unusual wear, or interference that could point to a setup issue.
How often should tires on a 2013 Infiniti M56 be inspected?
Tires on a 2013 Infiniti M56 should be inspected regularly, not only when tread wear becomes obvious. Pressure, sidewall condition, tread surface, and signs of uneven wear are all worth checking periodically, especially on a performance-luxury sedan where wheel size and profile can make changes more noticeable.
Cars that are driven infrequently still need attention because age, air loss, and storage conditions can affect tire condition over time. A quick routine around the car before longer drives helps catch cracking, bulges, cuts, or low pressure early, and that is just as important on an 18-inch setup as it is on a 20-inch one.
