The 2004 Infiniti M45 came to market as a rear-drive performance luxury sedan with a distinctly muscular personality, pairing Japanese refinement with V8 power in a segment usually defined by European rivals. That character makes tire selection especially important, because the car depends on confident road manners as much as straight-line presence. The 2004 Infiniti M45 uses a 235/45R18 radial tire on an 18-inch rim, giving owners one clear primary fitment to start from. Within that size, the real choice shifts to tire series and product character rather than alternate factory-type sizes. For owners focused on preserving the M45's intended stance and road feel, staying precise on size and wheel compatibility matters.
Which Tire Size Is Right for The 2004 Infiniti M45
The 2004 Infiniti M45 uses one primary tire size: 235/45R18, a radial fitment for an 18-inch wheel. The Base sub-model uses that same size, so the main decision is not which size fits, but which 235/45R18 tire best matches the car's intended road use, tire-series preferences, and wheel specifications.
A 235/45R18 tire uses a 235-millimeter nominal section width, a 45-series aspect ratio, radial construction, and an 18-inch rim diameter. On the 2004 Infiniti M45, that modern metric radial sizing suits the car's performance-oriented luxury-sedan character and keeps the fitment in the format the vehicle was designed around. Available choices in this size center on BFGoodrich blackwall radials across the g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. Selecting among them comes down to matching the correct size with the actual wheel width and the driving feel you want from the car.
Fitment for the 2004 Infiniti M45 is straightforward because the covered sub-model uses the same primary tire size. Checking the exact sub-model still helps confirm that the car remains on its original wheel diameter before comparing tire options.
1
2004 Infiniti M45 Base
The 2004 Infiniti M45 Base uses the same 235/45R18 radial tire fitment as the model core. That keeps tire selection focused on choosing the right blackwall radial within the correct size and confirming that the current 18-inch wheels match the intended setup.
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 2004 Infiniti M45 Tires for Sale
Available 235/45R18 tires for the 2004 Infiniti M45 focus on BFGoodrich blackwall radials in several g-Force series. That gives owners a straightforward comparison across tire-series character, load specification, weight, and wheel-width compatibility within the correct size.
Owners researching 2004 Infiniti M45 tires usually need clarity on the correct 235/45R18 fitment, 18-inch wheel compatibility, differences between available BFGoodrich g-Force options, and the basic inspection steps that matter before putting a performance luxury sedan back on the road.
Tire Size & Fitment
What tire size fits a 2004 Infiniti M45?
The 2004 Infiniti M45 uses a 235/45R18 radial tire. That size combines a 235-millimeter section width, a 45-series profile, and an 18-inch rim diameter, giving the car the modern performance-sedan fitment it was built around.
Getting the size right is only the first step. It is still important to confirm that the car is wearing 18-inch wheels, check actual wheel width against the tire's approved range, and make sure any aftermarket wheel or suspension change has not altered the clearance the original fitment expects.
What size rim does a 2004 Infiniti M45 use?
The primary tire fitment for the 2004 Infiniti M45 is built around an 18-inch rim diameter. The 235/45R18 size makes that clear, and the available tire options in this fitment are also intended for 18-inch wheels.
Rim diameter should be confirmed before ordering tires, especially on a used performance sedan that may have seen wheel upgrades over the years. Wheel width matters too, since the available 235/45R18 tires suit a range around 7.5 to 9 inches, and that affects how properly the tire sits on the wheel.
Does the 2004 Infiniti M45 Base use the same tire size?
Yes. The 2004 Infiniti M45 Base uses the same 235/45R18 radial tire size as the model core. That makes fitment simpler than on vehicles where trim levels or performance packages introduce multiple factory-type tire sizes.
Even with shared sizing, it is smart to inspect the car rather than assume every M45 remains unchanged. A previous owner may have installed different wheels, altered ride height, or chosen a nonstandard tire, so confirming the current wheel diameter and width keeps replacement choices aligned with the intended fitment.
Choosing the Right Tire
What should I consider when choosing a 235/45R18 tire for a 2004 Infiniti M45?
Start with the correct 235/45R18 size, then compare the tire's radial construction, approved wheel-width range, load specification, and overall product character. For the 2004 Infiniti M45, the available choices stay within one size but vary by g-Force series and related performance-oriented design details.
A good selection process matches the tire to how the car is actually used. A regularly driven M45 may call for different priorities than a lower-mileage weekend car, so compare wheel compatibility, sidewall style, and product specifications carefully instead of treating every 235/45R18 tire as the same choice.
What sidewall styles are available for 2004 Infiniti M45 tires?
The available 235/45R18 tires for the 2004 Infiniti M45 use a blackwall sidewall style. That keeps the presentation clean and contemporary, which suits the M45's early-2000s performance luxury look without introducing raised white lettering or vintage-style sidewall treatments.
Because the sidewall presentation is consistent, choosing among the available tires becomes more about tire series and specification than appearance alone. Owners who want the car to retain its original visual balance should still confirm that the wheel design, tire size, and overall stance remain in proportion after any wheel change.
What tire series are available for the 2004 Infiniti M45?
The 2004 Infiniti M45 has 235/45R18 tire options in BFGoodrich's g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. All are blackwall radials in the correct overall fitment category for the car's 18-inch wheel setup.
That means the decision is less about finding the right size and more about comparing how each series aligns with the way the M45 is driven. Wheel-width compatibility, load specification, and the intended role of the car should guide the final pick, especially if the sedan sees regular highway use or spirited weekend driving.
Restoration & Appearance
Which tire should I choose for a period-style 2004 Infiniti M45?
A period-style approach for the 2004 Infiniti M45 starts with keeping the original-type 235/45R18 radial sizing and 18-inch wheel diameter. Since the available options stay in a modern blackwall format, the emphasis is on preserving the sedan's early-2000s performance-luxury stance rather than recreating a vintage sidewall look.
Appearance works best when tire size, wheel diameter, and ride height remain visually balanced. An owner chasing a more exact as-delivered presentation should compare the current setup against original vehicle literature or marque-specific references, especially if the car has changed hands and may no longer wear its original wheel package.
Does correct tire fitment matter for a 2004 Infiniti M45 restoration?
Yes, correct tire fitment matters on a 2004 Infiniti M45 restoration because the tire size strongly affects the car's stance, wheel-well fill, and overall visual character. Keeping the proper 235/45R18 fitment helps the finished car look settled and proportionate instead of over-tired or under-tired.
Fitment also influences how authentic the restoration feels from behind the wheel. Even on a modern collector sedan, changing wheel diameter or using a different profile can alter the look and upset the visual relationship between tire, body, and suspension, so careful measurement is worthwhile before making any cosmetic change.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2004 Infiniti M45?
Yes. Modifications can affect tire fitment on a 2004 Infiniti M45 even when the replacement tire remains 235/45R18. Aftermarket wheels, changes in wheel width or offset, suspension lowering, and body alterations can all change the space available around the tire.
That is why the tire size alone should not be treated as the whole answer on a modified car. Check wheel diameter, wheel width, inner and outer clearance, and steering travel before settling on a tire, particularly if the M45 has been customized for appearance or fitted with nonstandard wheels.
What should I inspect before driving a 2004 Infiniti M45 on new tires?
Before driving a 2004 Infiniti M45 on new tires, inspect wheel condition, verify proper inflation, and make sure the tires are correctly seated and matched to the wheel size. It is also wise to look over suspension and steering components so the new tires are not asked to compensate for worn hardware.
A short road check should confirm that the car tracks properly and has no rubbing, vibration, or uneven behavior. Performance sedans respond noticeably to alignment and chassis condition, so any pull, unusual noise, or clearance issue is worth addressing early rather than wearing into a new set of tires.
How often should tires on a 2004 Infiniti M45 be inspected?
Tires on a 2004 Infiniti M45 should be inspected regularly, not only at service intervals. A performance-oriented sedan places real demand on its tires, so pressure, tread wear, cuts, bulges, and sidewall condition deserve routine attention even when the car is driven only occasionally.
Inspection becomes even more important when a car spends time parked, since age and storage conditions can matter as much as mileage. Checking the tires before longer drives helps catch slow air loss, uneven wear, or developing damage early, and it gives the owner a chance to confirm that the tires still suit the car's current setup.
