2006 Infiniti M45 Tires

A 2006 Infiniti M45 uses one of two radial tire sizes, depending on sub-model. The Base uses 245/45R18, while the Sport uses 245/40R19. Both are modern metric radial fitments, but they are tied to different wheel diameters and should not be treated as the same setup.

The practical first step is confirming whether the car is a Base or Sport and then checking the wheel diameter currently installed. A car that has had wheels changed over time may no longer match its original trim-based setup, so the tire choice should follow the actual wheel size and the intended fitment rather than the badge alone.

The 2006 Infiniti M45 uses either an 18-inch or 19-inch rim, depending on sub-model. The Base pairs with the 245/45R18 tire size on an 18-inch wheel, while the Sport uses 245/40R19 on a 19-inch wheel. Both sizes are radial metric fitments with different wheel requirements.

Wheel diameter is the main fitment checkpoint on this car because the two primary sizes are built around different rims. Before choosing tires, confirm the wheel itself rather than assuming the car still has its original setup. Rim width also matters, especially when comparing replacement tires from different series within the same nominal tire size.

No. The 2006 Infiniti M45 Base uses 245/45R18, while the 2006 Infiniti M45 Sport uses 245/40R19. Both are radial tires, but they are not the same size and they do not share the same wheel diameter, so trim identification affects the starting point for tire selection.

That difference matters because the Sport’s 19-inch fitment and the Base model’s 18-inch fitment lead to different product choices and rim-width ranges. A buyer should verify the sub-model, then inspect the actual wheels on the car. If the vehicle has been modified, the current wheel package should guide the decision more than the original trim name.

For a 2006 Infiniti M45 using 245/45R18, start with the correct Base-model size and confirm the tire is built for an 18-inch wheel. Available choices include blackwall radial options from BFGoodrich and Nitto, with series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2.

From there, compare the tire series, load-related specifications where stated, product weight, and the rim-width range for your wheels. This size commonly works with wheels in the 7.5- to 9-inch range among the available products, but the exact wheel on the car still matters. Matching the intended use of the car to the tire’s character is just as important as matching the size.

Tires for the 2006 Infiniti M45 are available from BFGoodrich and Nitto within the sizes used on this model. BFGoodrich appears in both 245/45R18 and 245/40R19 fitments, while Nitto is available in 245/45R18. All of the available products are radial blackwall tires intended for modern performance-oriented applications.

Brand is only one part of the decision, so it helps to compare the actual tire series and specifications within the correct size for the car. A Base model and a Sport model do not share the same tire size, and even within one size there can be differences in load capacity, weight, and wheel-width compatibility that matter more than the brand name alone.

The 2006 Infiniti M45 is supported by several radial tire series, including BFGoodrich g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and the Nitto NT555 G2. These series appear across the model’s 18-inch and 19-inch fitments, though not every series is offered in both sizes.

Series choice matters because it shapes how the tire fits into the car’s intended use, whether that means everyday road driving or a more performance-focused setup. The first filter should still be correct size and wheel diameter, followed by checking wheel-width suitability and any load figures listed for the exact tire being considered.

A period-style approach for a 2006 Infiniti M45 starts with keeping the correct original fitment format for the trim: 245/45R18 for the Base or 245/40R19 for the Sport. Since the available tires are modern blackwall radials, the appearance remains in line with the car’s original-era luxury-sport sedan character rather than a vintage or retro presentation.

The most important restoration-minded decision is preserving the proper wheel diameter and overall look of the trim-specific setup. Choosing a tire series then becomes a matter of road use and product specifications rather than sidewall styling variety. If exact historical presentation matters beyond size and stance, vehicle-specific literature and marque guidance are worth checking.

Yes, correct tire fitment matters because the 2006 Infiniti M45 used different wheel-and-tire combinations for Base and Sport models. Keeping the proper 245/45R18 or 245/40R19 size helps preserve the car’s intended stance, wheel proportion, and trim-specific appearance. Using the wrong wheel diameter changes the visual balance immediately.

Fitment also affects how faithfully the car presents as a Base or Sport model. Even on a driver-quality restoration, matching the correct trim-based size is a better starting point than choosing a tire only by tread pattern or brand. The car should also be checked for any wheel changes made by prior owners before finalizing a replacement set.

Yes. Wheel changes, suspension modifications, lowering, and body alterations can all affect tire fitment on a 2006 Infiniti M45. That matters even more here because the model already uses two different factory wheel diameters depending on trim, so an altered car may no longer match the original Base or Sport tire specification.

A modified M45 should be checked for actual wheel diameter, wheel width, and available clearance before replacement tires are chosen. Steering clearance and fender space are especially important when the car has aftermarket wheels or suspension changes. The safest approach is to verify the physical setup on the car first, then select a tire within that confirmed package.

Before driving a 2006 Infiniti M45 on new tires, inspect the wheels for damage, confirm the tires match the correct size for the car’s wheel diameter, and make sure inflation is set properly for the vehicle’s needs. It also helps to check alignment condition, valve stems, and whether the tires seat correctly on the wheels.

After installation, watch for rubbing, vibration, or uneven behavior during the first miles. Those signs can point to wheel damage, clearance issues, or suspension problems rather than a tire-size mistake alone. A performance sedan like the M45 benefits from a close look at suspension wear as well, since worn components can affect how a fresh set of tires feels on the road.

Tires on a 2006 Infiniti M45 should be inspected regularly, not only when tread looks low. Look over them for cracking, cuts, bulges, uneven wear, and air loss, and pay attention to any vibration or pulling that develops during use. On a low-mileage car, age and storage condition can matter as much as miles traveled.

Regular inspections are especially useful on a vehicle that may alternate between spirited use and long periods of sitting. Checking pressure, tread condition, and the sidewalls before longer drives helps catch problems early. It is also smart to inspect the inner sidewall and shoulder areas, since those can be missed during a quick walk-around but still affect roadworthiness.