Infiniti M45 Tires

Infiniti M45 uses three tire sizes across this production range. The 2003 and 2004 Infiniti M45 uses 235/45R18 on 18-inch wheels. From 2006 through 2010, Infiniti M45 uses either 245/45R18 on 18-inch wheels or 245/40R19 on 19-inch wheels, depending on the wheel package on the car.

That means year alone is not enough for later cars. If you have a 2006-2010 Infiniti M45, check the wheel diameter stamped on the tire sidewall already on the car or measure the wheel itself before choosing between the 18-inch and 19-inch fitments.

On an Infiniti M45, 235/45R18 is a modern metric radial size. The 235 is the nominal section width in millimeters, 45 is the aspect ratio, R means radial construction, and 18 is the wheel diameter in inches. In this application, that size belongs to 2003 and 2004 Infiniti M45 models.

Understanding the code helps you avoid substituting a tire that looks close but changes proportions or wheel fit. A 235/45R18 Infiniti M45 should stay on an 18-inch wheel, and moving to a different aspect ratio or rim diameter changes both fitment and how the car rides and steers.

A 2006 Infiniti M45 has two tire sizes listed because that model year appears with two different wheel diameters. One fitment uses 245/45R18 on an 18-inch wheel, while the other uses 245/40R19 on a 19-inch wheel. The split is tied to the wheel package rather than two interchangeable sizes on the same rim.

The practical takeaway is to identify the wheel actually on your car before selecting tires. If the car wears factory-style 18-inch wheels, stay with 245/45R18; if it wears 19-inch wheels, use 245/40R19. Matching the tire to the wheel diameter is the first fitment check on later Infiniti M45 models.

Infiniti M45 uses 18-inch and 19-inch rim diameters within this production range. The 2003-2004 Infiniti M45 is listed with 18-inch wheels only. From 2006 through 2010, Infiniti M45 appears with either 18-inch wheels paired with 245/45R18 tires or 19-inch wheels paired with 245/40R19 tires.

That change in wheel diameter is the key fitment point for this model. A tire for an 18-inch wheel will not fit a 19-inch wheel, even if the section width is similar, so confirm the actual wheel diameter on the car before comparing tread patterns or performance series.

For a 2006-2010 Infiniti M45, start with the wheel diameter and then match the corresponding tire size. Cars with 18-inch wheels use 245/45R18, while cars with 19-inch wheels use 245/40R19. The 2003-2004 Infiniti M45 remains separate, using 235/45R18 on 18-inch wheels.

The safest approach is to verify the size currently installed, inspect the wheel diameter directly, and compare that information with the year listing for your car. That matters most on later Infiniti M45 models, where two legitimate factory-era size paths exist within the same production years.

The available Infiniti M45 tires in this range are offered as blackwall radials. That applies across all three listed sizes, including 235/45R18, 245/45R18, and 245/40R19. No alternate sidewall styling appears within the listed products for this model group.

Blackwall construction suits the Infiniti M45's modern sport-luxury character and keeps the appearance consistent with the car's performance-oriented stance. If you are trying to maintain a clean, factory-appropriate look, the sidewall decision is straightforward here and the main choice becomes size and performance series.

Two brands appear in the available Infiniti M45 tire selection: BFGoodrich and Nitto. BFGoodrich covers all three listed sizes through several g-Force lines, while Nitto appears in the 245/45R18 size with the NT555 G2. That gives later 18-inch Infiniti M45 applications the widest brand choice in this group.

Brand selection matters after fitment is settled, not before. Once you have confirmed the correct size and wheel diameter for your Infiniti M45, you can compare the available brand options within that exact size instead of trying to make a tire from another fitment work.

Infiniti M45 tires in this group appear in four series: BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2. All are radial blackwall performance-oriented tires, but they represent different product lines rather than one universal tread design. The widest series coverage appears in the 18-inch sizes, while the 19-inch size is limited to BFGoodrich offerings here.

Choose among series only after you have established the correct size for the car. A 2003-2004 Infiniti M45 owner should focus on the 235/45R18 options, while a 2006-2010 owner should first determine whether the car uses 18-inch or 19-inch wheels and then compare series within that size.

An Infiniti M45 that sits for long periods should be stored in a cool, dry, dark space with the tires kept out of direct sunlight and away from ozone sources such as electric motors or welders. Maintain the tires at proper inflation and keep the car on a clean surface rather than bare dirt or damp concrete. Long stationary periods can create flat spotting on performance radials.

Moving the Infiniti M45 slightly from time to time helps change the tire contact patch, and a thorough wash before storage prevents road grime from staying on the sidewalls. If the car will be parked for a very long interval, many owners also reduce weight on the tires with stands placed correctly under the chassis.

Tires on an Infiniti M45 should be inspected regularly even if the car is not driven much. Check inflation pressure, tread wear, sidewall condition, and any signs of cracking, bulging, puncture damage, or irregular shoulder wear. A performance sedan like the Infiniti M45 can reveal alignment or suspension issues through the tires long before a failure occurs.

A sensible routine is to inspect the tires before any extended drive and again after seasonal storage. Later Infiniti M45 cars with 18-inch and 19-inch fitments also benefit from confirming that all four tires match the intended size for the wheel package, since mismatched replacements can slip in over time.

An Infiniti M45 tire should be replaced when age, cracking, impact damage, sidewall deterioration, or persistent vibration raises concerns, even if tread depth still looks usable. Collector-style low-mile use can make tires age out before they wear out. Performance radials may appear presentable while the rubber has already hardened beyond its best service life.

If the Infiniti M45 sees highway use, err on the side of caution and have older tires evaluated during regular service intervals. Replacement should be driven by condition and age as much as tread, especially on a heavier, more powerful sedan where stable braking and heat management matter.

Within this Infiniti M45 range, the listed factory-size paths are 235/45R18 for 2003-2004 models, 245/45R18 for some 2006-2010 models, and 245/40R19 for 2006-2010 models equipped with the larger wheel package. The available replacement tires are all modern blackwall radial performance tires. No single original-equipment brand is established by the listed products.

For an originality-focused Infiniti M45, the most important step is matching the correct size and wheel diameter to the specific year and configuration. If you are restoring a car for marque-correct presentation, compare the car's wheel package and surviving factory references before settling on a replacement series.

Correct tire fitment does affect how an Infiniti M45 presents, especially when the car is being preserved in a factory-style configuration. The right size keeps the stance, wheel-to-tire proportion, and overall appearance aligned with the proper year and wheel package. An incorrect 18-inch versus 19-inch setup is especially noticeable on later Infiniti M45 models.

For owners concerned with presentation, matching the wheel diameter first and the tire size second is the cleanest path. If the car may be judged or evaluated by marque enthusiasts, consistency with the intended year-specific setup matters more than simply choosing any tire that can be mounted.

Blackwall is the available sidewall style for the Infiniti M45 tires listed here, and it fits the model's modern luxury-performance era well. All listed products across 18-inch and 19-inch sizes use blackwall construction. No whitewall or period decorative sidewall treatment appears within this range.

That makes the visual choice relatively simple for a restoration-minded owner. If your goal is a factory-style appearance on an Infiniti M45, focus your effort on preserving the proper wheel diameter and matching tire size, because the sidewall presentation is already consistent across the available options.

The listed Infiniti M45 tires are modern radial performance tires intended for public-road use when they are the correct size for the wheel, properly mounted, and in sound condition. The key safety issue on this model is fitment accuracy, especially on 2006-2010 cars that may use either 18-inch or 19-inch wheels. A correct tire size is the baseline for predictable handling and load support.

Public-road safety also depends on the age and condition of the tire, not just the name on the sidewall. Before regular driving, confirm that the Infiniti M45 has a matched set, appropriate inflation, and no visible damage or severe age-related deterioration.

Before driving an Infiniti M45, inspect tire pressure, tread condition, sidewalls, and any signs of puncture damage or impact injury from potholes. Confirm that the tire size matches the wheel diameter on the car, particularly if the car is a 2006-2010 Infiniti M45 where both 18-inch and 19-inch setups exist. Also look for uneven wear that could point to alignment or suspension issues.

That quick inspection is especially worthwhile on a car that spends time parked, because low use can hide gradual air loss or age-related cracking. If anything feels off through the steering wheel or seat once moving, stop and recheck the tires before continuing at speed.

An Infiniti M45 should be driven at speeds appropriate to the condition, age, inflation, and correct fitment of the tires actually installed on the car. The listed replacements are modern radial performance tires, but road speed should still be guided by tire condition and by the car's overall mechanical state. A powerful sedan can stress an old or poorly matched tire very quickly.

The practical rule is to avoid treating the Infiniti M45 as fully sorted until the tires have been inspected and matched correctly to the wheel package. Even with a performance-oriented tire line, moderation is wise if the tires are older, the car has been stored, or the service history is uncertain.