The 2010 Infiniti M45 sits in the later years of Infiniti’s V8-powered sport-luxury sedan formula, blending executive-car comfort with rear-drive performance character. Buyers looking at one today are often balancing daily drivability against preserving the car’s sharper factory-era stance and handling feel. Tire fitment depends on sub-model, with 245/45R18 radial tires used on the Luxury and X, while the Sport uses 245/40R19 radials. That keeps the decision focused on confirming trim first, then comparing available blackwall performance-oriented tire series from BFGoodrich and Nitto within the correct size. For an M45 that has seen wheel or suspension changes, wheel diameter and rim width deserve a careful check before selection.
Which Tire Size Is Right for The 2010 Infiniti M45
The 2010 Infiniti M45 uses two primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Luxury and X models use an 18-inch radial setup, while the Sport uses a 19-inch radial setup. Before choosing a tire, confirm whether the car is a Luxury, Sport, or X and make sure the wheels still match the original diameter if the vehicle has been modified.
A 245/45R18 tire is a metric radial size with a 245-millimeter section width, a 45-series aspect ratio, and fitment for an 18-inch wheel. On the 2010 Infiniti M45, this size suits the Luxury and X models and keeps the selection in modern radial construction, which matches the car’s later-model sport-luxury character. Available choices include BFGoodrich and Nitto products in blackwall form, with series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2. This size is the one to evaluate when maintaining the 18-inch wheel setup on a non-Sport M45.
A 245/40R19 tire uses the same 245-millimeter nominal width but a lower 40-series profile and fits a 19-inch wheel. For the 2010 Infiniti M45, this size belongs to the Sport model, where the lower-profile radial format supports the trim’s distinct wheel-and-tire package. Product choices center on BFGoodrich blackwall tires across g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A series. This is the size to confirm when the car is an M45 Sport or when the car still carries its original 19-inch wheel diameter.
Sub-model fitment matters on the 2010 Infiniti M45 because tire size changes with trim. Luxury and X models share one radial size on 18-inch wheels, while the Sport uses a different radial size on a 19-inch wheel, so confirming the exact version is the first step before comparing tires.
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2010 Infiniti M45 Luxury
The 2010 Infiniti M45 Luxury uses the 245/45R18 radial tire size. That keeps the choice centered on selecting the right blackwall performance tire within the 18-inch fitment and confirming that the car still wears the correct wheel diameter if it has been changed over time.
The 2010 Infiniti M45 Sport uses the 245/40R19 radial tire size. Its tire decision starts with confirming the 19-inch wheel setup, then comparing available blackwall tire series intended for this lower-profile fitment rather than assuming the 18-inch M45 size will apply.
The 2010 Infiniti M45 X uses the 245/45R18 radial tire size, matching the Luxury model. Tire selection then becomes a matter of choosing among the available 18-inch blackwall radial offerings and checking wheel width compatibility before committing to a specific product.
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 2010 Infiniti M45 Tires for Sale
Available 2010 Infiniti M45 tires focus on the two factory-size radial fitments, with blackwall choices from BFGoodrich and Nitto. The main differences in the product grid are tire series, 18-inch versus 19-inch fitment, and rim-width specifications that should be matched to the wheel on the car.
Owners of a 2010 Infiniti M45 usually need clear answers on trim-specific tire size, 18-inch versus 19-inch wheel fitment, available radial choices, and what to inspect before putting a sport-luxury sedan back on the road.
Tire Size & Fitment
What tire size fits a 2010 Infiniti M45?
The 2010 Infiniti M45 uses two tire sizes, and the correct one depends on sub-model. The M45 Luxury and M45 X use 245/45R18 radial tires, while the M45 Sport uses 245/40R19 radial tires. Both are modern metric radial sizes, but they fit different wheel diameters and should not be treated as interchangeable primary fitments.
The practical first step is identifying whether the car is a Luxury, Sport, or X model, then confirming the actual wheel diameter on the vehicle. A used M45 may have aftermarket wheels or a swapped wheel package, so checking the wheels before choosing a tire helps avoid ordering the right size for the wrong setup.
What size rim does a 2010 Infiniti M45 use?
A 2010 Infiniti M45 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 the 245/40R19 size on a 19-inch wheel. The tire size itself confirms the wheel diameter because the final number in each size is the rim size in inches.
Wheel diameter is the most important fitment point to verify before comparing tires. Rim width matters too, especially if the car has replacement wheels, since available products in these sizes are built around specific width ranges. Checking both diameter and width will narrow the choices to tires that suit the wheel already on the car.
Do all 2010 Infiniti M45 sub-models use the same tire size?
No, the 2010 Infiniti M45 does not use one tire size across every sub-model. The Luxury and X models share 245/45R18 radial tires, while the Sport uses 245/40R19 radial tires. The difference is tied to trim, so the M45 lineup needs a trim-specific tire decision rather than a one-size-fits-all answer.
That distinction matters because the two sizes mount to different wheel diameters and represent different overall fitment packages. A buyer looking at an M45 Sport should start with the 19-inch setup, while a Luxury or X owner should stay focused on the 18-inch size. Confirming the trim badge alone is helpful, but checking the wheels remains the safer final step.
Choosing the Right Tire
What should I consider when choosing a tire for a 2010 Infiniti M45?
Start with the correct size for the car’s trim: 245/45R18 for the Luxury and X, or 245/40R19 for the Sport. From there, compare tire series, radial construction details, rim-width compatibility, and any stated load figures that apply to the specific product. All available options here are blackwall radials, so the decision is centered more on fitment and tire character than on appearance variations.
Use the car the way it is actually driven when narrowing the options. A lower-use weekend sedan may point toward one tire choice, while a regularly driven M45 may call for a different series within the same size. It also helps to confirm whether the car still carries stock-width wheels, since wheel changes can narrow the suitable product range.
What brands offer tires for the 2010 Infiniti M45?
Tires for the 2010 Infiniti M45 are available from BFGoodrich and Nitto in the sizes used on this model. BFGoodrich appears in both the 18-inch and 19-inch fitments, while Nitto is available in the 245/45R18 size. The available products stay within modern radial construction and focus on blackwall performance-oriented offerings.
Brand is only one part of the decision, so it helps to compare each option by series, wheel compatibility, and any published load or weight details that matter to your setup. The strongest comparison is usually between products within the exact size already on the car rather than between brands alone, especially when wheel diameter differs by sub-model.
What tire series are available for the 2010 Infiniti M45?
The 2010 Infiniti M45 is served by several series, including BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and Nitto NT555 G2. The 245/45R18 size offers the broadest spread across those series, while the 245/40R19 size is represented by BFGoodrich g-Force options. All are radial blackwall tires in the correct modern sizing format for this car.
Series differences give the buyer something useful to compare beyond brand name alone. Looking at the exact series can help separate all-season-oriented and sport-oriented choices, while rim-width specifications help determine whether a product suits the wheel on the car. That makes the series name a practical sorting point once the correct size is already confirmed.
Restoration & Appearance
Which tire should I choose for a period-style 2010 Infiniti M45?
A period-style approach on a 2010 Infiniti M45 starts with staying in the correct factory-era size for the specific sub-model. That means 245/45R18 for the Luxury and X or 245/40R19 for the Sport, both in modern radial construction. Since the available products are blackwall tires, the visual result stays consistent with the understated sport-luxury presentation that suits this generation.
The next decision is how closely the car itself still matches its original wheel setup. A period-style result depends as much on wheel diameter, wheel width, and ride height as it does on the tire. If exact originality matters, compare the car’s current configuration with marque-specific references before choosing among the available radial series.
Does correct tire fitment matter for a 2010 Infiniti M45 restoration?
Yes, correct tire fitment matters because the 2010 Infiniti M45 uses trim-specific wheel and tire packages that affect both appearance and stance. A Luxury or X on 245/45R18 presents differently than a Sport on 245/40R19, even though both stay close in overall tire diameter. Using the proper size for the sub-model helps preserve the car’s intended visual balance.
Fitment also influences how convincingly the restoration comes together once the car is back on the road. The wrong wheel diameter or an unsuitable wheel width can change sidewall proportion and how the car sits in the wheel opening. Matching the tire size to the correct trim is the starting point, then wheel details should be verified before final installation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2010 Infiniti M45?
Yes, modifications can affect tire fitment on a 2010 Infiniti M45 even when the car started with the correct factory-size tire. Aftermarket wheels, changes in wheel width, suspension lowering, or body alterations can all change the space available for a 245/45R18 or 245/40R19 tire. That matters because the M45 already uses two trim-specific wheel diameters across the lineup.
The safest approach is to inspect the actual wheel diameter and width on the car, then check for clearance around the fender, suspension, and steering range before choosing a tire. A product that suits a stock wheel may not be the best match for a modified one. Used sport sedans often change hands with wheel swaps already in place.
What should I inspect before driving a 2010 Infiniti M45 on new tires?
Before driving a 2010 Infiniti M45 on new tires, inspect the wheels for the correct diameter and any visible damage, then confirm inflation pressure, valve condition, and proper installation. It also helps to look over suspension and steering components, since worn parts can affect how a fresh set of radials feels on the road. Basic alignment condition is worth attention as well.
A quick clearance check is smart before full road use, especially if the car has non-stock wheels or altered ride height. Turn the steering from lock to lock and look for rubbing concerns where applicable. After the first miles, recheck pressure and look for any uneven contact or vibration so small setup issues can be addressed early.
How often should tires on a 2010 Infiniti M45 be inspected?
Tires on a 2010 Infiniti M45 should be inspected regularly, not just when tread wear becomes obvious. Routine checks should look for pressure loss, uneven wear, sidewall damage, cuts, bulges, and age-related cracking. On a sport-luxury sedan with lower-profile fitments like 245/40R19, small condition issues can become noticeable in ride quality and handling sooner than many owners expect.
Cars that see occasional use deserve the same attention as daily drivers, since long parking periods can hide slow air loss or age-related deterioration. A good habit is to inspect the tires visually before longer drives and anytime the car has been stored for a while. Keeping pressure and condition in check protects both the tire and the wheel package.
