The 2007 Infiniti M45 sits in the era when Japanese luxury sport sedans were balancing V8 power, sharp road manners, and everyday comfort in a very deliberate way. It is a car that rewards owners who pay attention to the details, especially when tire choice affects both stance and driving character. Tire fitment on the 2007 Infiniti M45 is straightforward once the exact sub-model is confirmed, because the Base uses 245/45R18 radial tires while the Sport uses 245/40R19 radials. Available choices focus on modern blackwall performance-oriented radials from BFGoodrich and Nitto, so the real decision is matching the correct size, wheel diameter, and tire series to the way the car is equipped and driven.
Which Tire Size Is Right for The 2007 Infiniti M45
Two tire sizes apply to the 2007 Infiniti M45, and the correct one depends on the sub-model and wheel diameter. The Base uses an 18-inch radial fitment, while the Sport uses a 19-inch radial fitment. Before comparing tires, confirm whether the car is a Base or Sport and verify that it still has the correct wheel diameter, especially if wheels have been changed over the years.
A 245/45R18 tire uses a 245-millimeter section width, a 45-series aspect ratio, radial construction, and an 18-inch rim diameter. On the 2007 Infiniti M45, this is the Base model fitment, so it suits owners who need the proper size for that wheel package rather than the Sport setup. Available choices in this size include BFGoodrich and Nitto products, all 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 right place to compare tire series, load-related specifications, and wheel-width compatibility for an 18-inch-equipped M45 Base.
A 245/40R19 tire keeps the same 245-millimeter nominal width as the 18-inch fitment, but pairs it with a lower 40-series profile on a 19-inch rim. On the 2007 Infiniti M45, this size belongs to the Sport model and reflects its distinct wheel package. BFGoodrich offers this size in blackwall performance-oriented series including g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A. This is the size to evaluate when the car is equipped with the 19-inch Sport wheels and the goal is preserving the intended fitment rather than mixing Base and Sport wheel diameters.
Sub-model fitment matters on the 2007 Infiniti M45 because the tire size changes with the wheel package. Confirming whether the car is a Base or Sport model is the first step before comparing products, since the two versions use different rim diameters and different radial sizes.
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2007 Infiniti M45 Base
The 2007 Infiniti M45 Base uses an 18-inch radial fitment built around the 245/45R18 size. Tire selection for this sub-model centers on choosing among available blackwall performance radials while confirming that the car still wears the proper 18-inch wheels.
The 2007 Infiniti M45 Sport uses a 19-inch radial fitment with the 245/40R19 size. That makes wheel confirmation especially important, because tire choice for the Sport begins with retaining the correct 19-inch setup before comparing series and other product details.
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 2007 Infiniti M45 Tires for Sale
Available 2007 Infiniti M45 tires focus on 245/45R18 and 245/40R19 radial performance fitments from BFGoodrich and Nitto. The main comparison points in the product grid are tire series, wheel-width compatibility, load-related specifications where stated, and the correct 18-inch or 19-inch application.
Common 2007 Infiniti M45 tire questions usually come down to identifying the correct Base or Sport fitment, understanding the 18-inch versus 19-inch wheel setup, and comparing the available radial tire series for road use, appearance, and maintenance.
Tire Size & Fitment
What tire size fits a 2007 Infiniti M45?
The 2007 Infiniti M45 uses two tire sizes, depending on sub-model. The Base model uses 245/45R18 radial tires, while the Sport model 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 the same fitment choice.
The first step is confirming whether the car is a Base or Sport and checking that it still has the correct wheels. Many older performance sedans have seen wheel changes over time, so measuring wheel diameter before ordering tires helps prevent a mismatch between the car's current setup and the intended tire size.
What size rim does a 2007 Infiniti M45 use?
A 2007 Infiniti M45 uses either an 18-inch or 19-inch rim, depending on sub-model. The Base pairs with 245/45R18 tires on an 18-inch rim, while the Sport pairs with 245/40R19 tires on a 19-inch rim. The tire size and rim diameter are directly linked on this vehicle.
Wheel diameter should be confirmed before comparing tires, especially on a car that may have had replacement or aftermarket wheels installed. Tire size selection starts with the actual rim on the vehicle, and wheel width also matters because the available products in these sizes are built around specific compatible rim-width ranges.
Do all 2007 Infiniti M45 sub-models use the same tire size?
No. The 2007 Infiniti M45 Base uses 245/45R18, while the 2007 Infiniti M45 Sport uses 245/40R19. Both are radial tires, but the fitment changes with the sub-model because the wheel diameter changes as well, making this more than a simple sidewall variation.
That difference matters when replacing tires because the correct choice is tied to the car's actual wheel package. A buyer should confirm the sub-model, inspect the wheel diameter currently on the car, and avoid assuming that any tire marketed for a 2007 M45 applies across both Base and Sport configurations.
Choosing the Right Tire
What should I consider when choosing a 245/45R18 tire for a 2007 Infiniti M45?
For a 2007 Infiniti M45, a 245/45R18 tire applies to the Base model and should be chosen as an 18-inch radial fitment. Available options include BFGoodrich and Nitto products, with series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2, all offered as blackwalls.
The useful comparison points are wheel-width compatibility, any stated load figures, and the type of driving the car sees. An M45 that still carries its original wheel diameter but has changed wheels in width or offset should be checked carefully so the selected tire matches both the size requirement and the actual wheel setup.
What brands offer tires for the 2007 Infiniti M45?
Tires for the 2007 Infiniti M45 are available from BFGoodrich and Nitto in the covered fitments. BFGoodrich appears in both 245/45R18 and 245/40R19 sizes, while Nitto is available in the 245/45R18 size. The available choices are all radial blackwall performance-oriented tires.
Brand is only one part of the decision. It still helps to compare tire series, compatible wheel-width ranges, and any stated load-related specifications in the exact size that matches the car. The right comparison starts with the correct Base or Sport fitment, then narrows to the product details that suit the vehicle's current wheel package.
What tire series are available for the 2007 Infiniti M45?
The 2007 Infiniti M45 is covered by several tire series, including BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2. These series appear across the vehicle's two fitments, though not every series is offered in both sizes.
Series choice matters because it helps separate one radial option from another even when the overall size is the same. Once the proper 18-inch Base or 19-inch Sport fitment is confirmed, compare series alongside wheel-width compatibility and any stated load figures so the tire matches the car's configuration rather than just its model name.
Restoration & Appearance
Which tire should I choose for a period-style 2007 Infiniti M45?
A period-style 2007 Infiniti M45 starts with using the correct modern metric radial size for the specific sub-model. That means 245/45R18 for the Base or 245/40R19 for the Sport. Since the available products are blackwall radials, the appearance focus is less about vintage sidewall treatments and more about keeping the correct wheel-and-tire proportion.
Owners aiming for a clean, original-era presentation should avoid mixing Base and Sport wheel diameters without verifying the visual and fitment impact. If exact restoration authenticity matters beyond basic size, vehicle-specific reference material and marque-community guidance can help confirm which wheel and tire presentation best matches the car's original delivery configuration.
Does correct tire fitment matter for a 2007 Infiniti M45 restoration?
Yes. Correct tire fitment matters on a 2007 Infiniti M45 because the Base and Sport models use different wheel diameters and different tire sizes. A restoration-minded approach should preserve the proper relationship between the car's sub-model, its wheel package, and its radial tire size rather than treating all M45 versions the same.
Using the right fitment helps maintain the intended stance and keeps wheel choice from becoming the weak link in an otherwise careful project. Checking the tire size, wheel diameter, and wheel width together is especially important on cars that may have received aftermarket wheels or replacement rims during years of normal use.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2007 Infiniti M45?
Yes. Modifications can affect tire fitment on a 2007 Infiniti M45 even when the tire size looks correct on paper. Aftermarket wheels, changes in wheel width or offset, suspension lowering, and body or brake changes can all alter the clearance available for either the 245/45R18 Base fitment or the 245/40R19 Sport fitment.
A modified M45 should be checked at the wheel wells and steering range before settling on a replacement tire. Wheel diameter is only part of the picture; the actual wheel width and placement under the car matter too. That is especially important when replacing worn tires on a car with unknown modification history.
What should I inspect before driving a 2007 Infiniti M45 on new tires?
Before driving a 2007 Infiniti M45 on new tires, inspect wheel condition, confirm the wheel diameter and width, and make sure the selected size matches the sub-model. It also helps to look over valve stems, check inflation pressure, and verify that there is no rubbing at full steering lock or under normal suspension movement.
A quick inspection of the car itself is just as important as the tires. Worn suspension parts, alignment issues, or damaged wheels can shorten tire life and affect road manners. Giving the M45 a careful once-over before regular use helps the new tires work as intended and reduces the chance of fitment surprises.
How often should tires on a 2007 Infiniti M45 be inspected?
Tires on a 2007 Infiniti M45 should be inspected regularly, not just when tread looks low. Check them for air loss, uneven wear, cuts, bulges, and sidewall cracking, and pay attention after any impact or long storage period. That matters on a performance-oriented sedan where wheel condition and alignment influence tire wear quickly.
Routine inspection is especially helpful when the car is driven less often, because age and storage conditions can matter as much as mileage. Looking over the tires before longer drives and monitoring pressure consistently can catch problems early. A collector-kept or lightly used M45 still benefits from the same disciplined tire checks as a daily driver.
