In 2004, Infiniti balanced sport-luxury performance and premium comfort across a lineup that ranged from the athletic G35 to the executive-oriented I35, M45, and Q45. That mix matters because 2004 Infiniti vehicles did not all use the same tire size, even though the lineup stayed firmly in the modern radial era. Four models share seven distinct sizes, with some fitments unique to a single model and a few sizes overlapping between two models. The first thing to confirm on a 2004 Infiniti is the exact model, then whether your car uses a 17-inch or 18-inch fitment, since that determines which tire size and product range applies.
Which Tire Size Is Right for Your 2004 Infiniti
Seven tire sizes are used across 2004 Infiniti vehicles, and they vary by model rather than carrying across the full lineup. The real decision starts with identifying the correct model and confirming whether your car takes a 17-inch or 18-inch tire, since every size here is a radial but the rim diameter and section dimensions change from one application to another. Understanding that distinction before choosing a product saves time and helps ensure the right match.
Year(s): 2004|Fit(s): G35|Construction: Radial|Rim: 17 in
225/50R17 is a metric radial size with a 225-millimeter section width, a stated 50-series aspect ratio, and a 17-inch rim diameter. This G35-specific size is available from BFGoodrich and Nitto in Blackwall form, with W-rated products present and load capacities reaching 1,653 pounds at 50 psi on some versions. It suits G35 owners who want to stay with the model's proper 17-inch fitment while choosing among modern performance-oriented radial options.
Year(s): 2004|Fit(s): G35|Construction: Radial|Rim: 17 in
235/50R17 is a metric radial size that uses a 235-millimeter section width, a 50-series aspect ratio, and a 17-inch rim. This size is specific to the G35 rather than universal across 2004 Infiniti models, and it appears in BFGoodrich Blackwall form with a W speed rating. It is the right path for a G35 that requires the wider 17-inch fitment instead of the other 17-inch sizes used elsewhere in the Infiniti range.
Year(s): 2004|Fit(s): G35|Construction: Radial|Rim: 18 in
225/45R18 is a metric radial size with a 225-millimeter section width, a 45-series aspect ratio, and an 18-inch rim diameter. This G35-specific size is available from BFGoodrich and Nitto in Blackwall form, with W-rated products across the range and load capacities reaching 1,521 pounds at 50 psi on some versions. It fits G35 applications that use the smaller of the model's 18-inch sizes and is aimed at drivers who want a modern low-profile radial fitment.
Year(s): 2004|Fit(s): G35, Q45|Construction: Radial|Rim: 18 in
245/45R18 is a metric radial size with a 245-millimeter section width, a 45-series aspect ratio, and an 18-inch rim. It serves the G35 and Q45 rather than the whole 2004 Infiniti lineup, and it is available from BFGoodrich and Nitto in Blackwall form with speed ratings that vary by product: W up to 168 mph and Y up to 186 mph. This size is the shared 18-inch choice for buyers whose G35 or Q45 calls for a broader performance-oriented fitment.
Year(s): 2004|Fit(s): G35, I35|Construction: Radial|Rim: 17 in
215/55R17 is a metric radial size built around a 215-millimeter section width, a 55-series aspect ratio, and a 17-inch rim diameter. It is used on the G35 and I35, and available products come from BFGoodrich in Blackwall form with W speed ratings and load capacities reaching 1,653 pounds at 50 psi on some versions. This size makes sense for buyers who need the shared 17-inch fitment used by those two models rather than the wider alternatives found elsewhere in the lineup.
Year(s): 2004|Fit(s): M45|Construction: Radial|Rim: 18 in
235/45R18 is a metric radial size with a 235-millimeter section width, a 45-series aspect ratio, and an 18-inch rim. This size is exclusive to the M45 within the 2004 Infiniti range, and it is available from BFGoodrich in Blackwall form with W speed ratings and load capacities up to 1,653 pounds at 50 psi on some products. It is the correct choice when the car is an M45 and needs its own 18-inch fitment rather than the G35 or Q45 sizes.
Year(s): 2004|Fit(s): Q45|Construction: Radial|Rim: 17 in
225/55R17 is a metric radial size with a 225-millimeter section width, a 55-series aspect ratio, and a 17-inch rim diameter. This Q45-specific size is available from BFGoodrich in both Blackwall and Wide Whitewall styles, with speed ratings that vary by product, including W up to 168 mph, and load capacities reaching 1,819 pounds at 50 psi on some versions. It gives Q45 owners a choice between a conventional modern appearance and a more stylized sidewall treatment, while staying within the proper 17-inch fitment.
Four Infiniti models are covered for 2004: G35, I35, M45, and Q45. Tire size varies by model, and in the case of the G35, several different fitments appear within the same model line, so identifying the exact model is the key first step before narrowing down a tire. Select a model below for model-specific fitment history and products.
2004 Infiniti G35
The 2004 Infiniti G35 was the brand's performance centerpiece, known for bringing rear-drive sport-luxury character into the lineup with sedan and coupe appeal. Its tires mount on either 17-inch or 18-inch rims depending on the application, which is why the G35 carries the broadest spread of sizes in the 2004 Infiniti range.
The 2004 Infiniti I35 leaned more toward comfort and traditional luxury-sedan duty than the sport-focused G-series cars. Its tire fitment stays straightforward with a 17-inch application, making model identification simpler than on the broader G35 range.
The 2004 Infiniti M45 combined V8 power with a more aggressive luxury-sport mission, giving it a distinct place in Infiniti's early-2000s lineup. Its tires mount on 18-inch rims and use a single dedicated size, separating it cleanly from the I35 and most Q45 fitments.
The 2004 Infiniti Q45 served as the flagship luxury sedan, emphasizing space, refinement, and high-speed composure more than the compact athleticism of the G35. It uses either a 17-inch or 18-inch fitment depending on application, including one size shared with the G35 and another unique to the Q45.
Twenty-two products are available across seven tire sizes for 2004 Infiniti vehicles. Coverage includes 225/50R17 from BFGoodrich and Nitto, 235/50R17 from BFGoodrich, 225/45R18 from BFGoodrich and Nitto, 245/45R18 from BFGoodrich and Nitto, 215/55R17 and 235/45R18 from BFGoodrich, and 225/55R17 in Blackwall and Wide Whitewall radial form. Confirm the exact size first, since speed ratings vary within some sizes.
These answers focus on how 2004 Infiniti tire sizes change from model to model, how the G35 differs from the rest of the lineup, and what to check on radial tires for fitment, sidewall style, highway use, and collector-car aging.
Size Basics & Fitment
What tire sizes fit 2004 Infiniti vehicles?
2004 Infiniti vehicles use seven tire sizes across four models: 225/50R17, 235/50R17, 225/45R18, 245/45R18, 215/55R17, 235/45R18, and 225/55R17. The G35 uses 225/50R17, 235/50R17, 225/45R18, 245/45R18, and 215/55R17; the I35 uses 215/55R17; the M45 uses 235/45R18; and the Q45 uses 225/55R17 and 245/45R18. Rim diameters are either 17 inches or 18 inches, and rim width ranges vary by size, from 6.0-7.5 inches on 215/55R17 up to 7.5-9.0 inches on several 18-inch sizes.
That means year and make alone are not enough to pick the right tire for a 2004 Infiniti. Start by confirming the exact model, then confirm whether the car uses a 17-inch or 18-inch fitment before comparing brands or tread styles. The G35 needs the most careful attention because it appears with multiple sizes, while the I35 and M45 each stay with one size. If the car has aftermarket wheels, compare the existing tire sidewall and wheel dimensions against the intended fitment before moving forward.
What does 225/50R17 mean on a 2004 Infiniti tire?
On a 2004 Infiniti, 225/50R17 is a metric radial size. The 225 is the nominal section width in millimeters, 50 is the aspect ratio, meaning the sidewall height is 50 percent of the section width, R identifies radial construction, and 17 is the wheel diameter in inches. Within the 2004 Infiniti range, this size applies to the G35 and uses a 17-inch rim, with products built around rim widths from 6.0 to 8.0 inches.
That decoding helps separate it from the other G35 fitments, especially the wider 235/50R17 and the lower-profile 18-inch sizes. It is not interchangeable simply because another 2004 Infiniti also uses a 17-inch wheel. Width, aspect ratio, and intended wheel width all need to stay in the right range. If you are replacing a matched set, compare the size molded into the current tire and check the car's wheel diameter before choosing among available radial products.
Do all 2004 Infiniti models use the same tire size?
No. Tire size varies across the 2004 Infiniti lineup, and only a couple of sizes overlap between models. The 215/55R17 is shared by the G35 and I35, while the 245/45R18 is shared by the G35 and Q45. Every other size is tied to a specific model application, including 235/45R18 for the M45 and 225/55R17 for the Q45.
That makes model identification more important than it might be on a year-and-make page where all vehicles share one fitment. The G35 especially needs close attention because it spans both 17-inch and 18-inch applications. If you are uncertain whether the car is wearing original-size tires, use the actual sidewall size and wheel diameter as a checkpoint, then compare that against the proper fitment for the model before deciding on a replacement.
Buying the Right Tire
What sidewall styles are available for 2004 Infiniti tires?
Most 2004 Infiniti tire sizes are available in Blackwall radial form. The exception is 225/55R17 for the Q45, which appears in both Blackwall and Wide Whitewall versions. That makes the Q45 the one model in this group with a meaningful sidewall-style choice beyond the standard modern look used by the rest of the lineup.
For a factory-leaning 2004 Infiniti appearance, Blackwall is the natural fit across the range. A Wide Whitewall treatment on a 2004 Q45 creates a more stylized custom look rather than a typical early-2000s luxury-sedan presentation. Buyers choosing for visual character should decide that question after confirming the correct tire size, because the sidewall-style choice exists only within that one Q45 fitment and does not carry over to the other sizes.
What brands make tires for 2004 Infiniti vehicles?
BFGoodrich covers every 2004 Infiniti size in this group, while Nitto appears in selected G35 and Q45-related fitments such as 225/50R17, 225/45R18, and 245/45R18. Some sizes stay within one brand family, including 235/50R17, 215/55R17, 235/45R18, and 225/55R17, while others give a two-brand choice. All of these applications are radial tires built around modern performance or touring-style fitments rather than vintage bias-ply construction.
That means brand choice depends partly on the exact size your car uses. A G35 owner often has the broadest spread of brand and series options, while an I35 or M45 owner may be comparing fewer product families in the correct size. Once the fitment is confirmed, compare speed rating, load capacity where shown, and sidewall appearance rather than assuming every 17-inch or 18-inch Infiniti size carries the same selection depth.
What is the difference between BFGoodrich g-Force Comp 2 A/S and Nitto NT555 G2 for the 2004 Infiniti?
On 2004 Infiniti sizes where both appear, such as 225/50R17, 225/45R18, and 245/45R18, both are Blackwall radial tires with W-speed capability in the examples here. The Nitto versions in 225/50R17 and 245/45R18 carry explicit XL markings and show max loads of 1,653 and 1,764 pounds at 50 psi, while the BFGoodrich g-Force Comp 2 A/S examples emphasize the same core fitments with similar rim-width coverage but without the same load figure shown on every entry.
For a 2004 Infiniti owner, the practical difference is less about basic compatibility and more about the exact product character within the correct size. Compare the sidewall marking, load notation, and wheel-width range for the specific size you need. That matters most on the G35 and the shared 245/45R18 fitment, where more than one product family covers the same application and the final choice comes down to the tire's spec details rather than year-make-model alone.
Fitting & Setup
What rim width do 2004 Infiniti tires require?
Rim width depends on the exact tire size used on the 2004 Infiniti. The 215/55R17 fits 6.0-7.5 inch rims, 225/50R17 and 225/55R17 fit 6.0-8.0 inch rims, 235/50R17 fits 6.5-8.5 inch rims, 225/45R18 fits 7.0-8.5 inch rims, and both 235/45R18 and 245/45R18 fit 7.5-9.0 inch rims. Some products show an ideal measuring width inside that range, but the usable span stays the key fitment reference.
That range matters because two tires can share the same rim diameter while needing different wheel widths for proper fit and sidewall shape. It is especially important on the G35, where several 17-inch and 18-inch sizes appear. Before replacing tires on a car with non-original wheels, verify the actual wheel width rather than assuming that any tire with the correct diameter will seat and perform correctly.
Do 2004 Infiniti tires require inner tubes?
These 2004 Infiniti fitments are modern radial sizes, and the product markings shown here do not indicate tube-type construction. The tire sizing and performance format point toward tubeless passenger-car applications rather than tube-type service. That aligns with the design era of 2004 Infiniti sedans and coupes, which were built around modern wheel and tire systems rather than vintage tube-type rims.
Even so, the correct approach is to confirm the actual wheel condition and the specific tire's sidewall marking before installation. A damaged wheel bead seat, a specialty wheel, or a modified setup can change the conversation even when the tire itself is intended for tubeless use. If the car has original wheels, inspect the valve stems and sealing surfaces as carefully as the tire itself, since a slow leak often comes from hardware rather than tread or carcass condition.
Maintenance, Storage & Longevity
How should I store a 2004 Infiniti when the tires are fitted?
A 2004 Infiniti should be stored on clean, properly inflated tires away from direct sunlight, electric motors, battery chargers, welders, and other ozone sources that age rubber. Keep the car on a dry surface and move it occasionally so the tires do not sit under one contact patch for months at a time. Because every fitment here is radial, long static storage is generally less prone to severe flat-spotting than older bias-ply designs, but pressure loss and sidewall aging still matter.
For winter layups or longer collector storage, many owners either reposition the car periodically or use stands in a way that does not stress suspension points improperly. The goal is to protect the tire from time, environment, and underinflation rather than from mileage. If the car is driven infrequently, check pressure before storage and again before the first drive out, since a tire can look healthy and still be low enough to affect wear and handling.
How long do tires on a 2004 Infiniti typically last?
On a 2004 Infiniti, tire age is usually a more important measure than miles, especially if the car is a low-use luxury or collector vehicle. A good rule is to begin careful evaluation around the five- to seven-year mark and to treat about ten years as the point where replacement deserves serious consideration regardless of remaining tread. The DOT date code on the sidewall is the reliable way to identify age.
That approach matters because rubber hardens and internal materials age even when a car spends most of its life parked. A G35 that sees spirited weekend use and a Q45 that spends months in storage can both need replacement for age-related reasons before tread depth looks exhausted. If you are buying a 2004 Infiniti or reviving one after long storage, check the date code first and treat tire condition as part of the car's baseline mechanical assessment.
How often should tires on a 2004 Infiniti be inspected?
Tires on a 2004 Infiniti should be checked before every drive and inspected more carefully before any extended trip. Look for visible cracking, bulges, punctures, uneven shoulder wear, tread damage, and pressure loss. Since these are tubeless radial fitments, the inspection should also include valve stems and the wheel-to-bead sealing area, especially on cars that have sat for long periods.
Frequent inspection is particularly important on an older premium car because many examples now live low-mileage lives and may age out before they wear out. Catching a slow leak or sidewall issue in the garage is far better than discovering it at highway speed. If one tire on a 2004 Infiniti shows irregular wear, use that as a prompt to inspect alignment, suspension bushings, and wheel condition rather than treating the tire alone as the whole problem.
Safety & Road Use
Are 2004 Infiniti tires safe for highway driving?
Yes, the 2004 Infiniti tire sizes here are modern radial passenger-car fitments, and the products shown carry W or, in one 245/45R18 application, Y speed ratings. W is rated up to 168 mph, while Y is rated up to 186 mph. Those ceilings are far above normal U.S. highway use, so in everyday driving the tire's speed capability is generally not the limiting factor on a properly maintained 2004 Infiniti.
Real-world highway safety depends just as much on tire age, inflation, alignment, and the condition of the car's suspension and brakes. A fresh, correctly sized radial with the proper load and speed capability is only part of the picture. Before sustained highway driving, make sure the tires match the car's correct size, hold pressure consistently, and show no signs of age cracking or impact damage from potholes or curb contact.
What inflation pressure should I use for 2004 Infiniti tires?
The tire products in these 2004 Infiniti sizes show maximum load and pressure figures on some applications, but those are tire-capacity ratings rather than a blanket running-pressure recommendation for every model. Examples include 1,521 pounds at 50 psi in 225/45R18, 1,653 pounds at 50 psi in 215/55R17 and 235/45R18, 1,764 pounds at 50 psi in 245/45R18, and up to 1,819 pounds at 50 psi in 225/55R17. The correct everyday inflation target should come from the vehicle placard or owner's manual for the exact model and fitment.
That distinction matters because using the maximum pressure molded for tire load capacity can easily produce the wrong ride and contact patch for a road car. Keep the size-specific load information in mind, but set pressure according to Infiniti's factory guidance unless a tire manufacturer recommends otherwise for that exact application. Recheck pressures cold, not after driving, and never assume that a 17-inch Q45 setting belongs on a G35 just because both are 2004 Infiniti vehicles.
What should I check before taking a 2004 Infiniti on a longer drive?
Before a longer drive in a 2004 Infiniti, inspect each tire for cracking, cuts, bulges, punctures, uneven wear, and correct cold inflation pressure. Check the spare as well, since many older cars carry an unused but overaged emergency tire. Because these are performance-oriented radial sizes, also take a close look at wheel condition and make sure there is no bead-seat corrosion or bent-rim damage that could create vibration or leakage.
Treat the tires as one part of a full pre-trip routine on a twenty-year-old luxury or sport-luxury car. If the car has been sitting, a brief neighborhood drive can reveal flat spotting, pull, or vibration before you commit to a highway run. That is especially worthwhile on G35, M45, and Q45 applications using lower-profile 18-inch tires, where pothole damage or long-term neglect can show up more quickly than on a taller sidewall fitment.
