The 2009 Mazda RX-8 sits in the late run of Mazda’s rotary-powered sports car, a model known for its high-revving character, balanced chassis, and distinctive four-door coupe layout. Tire choice matters on this car because its steering feel and overall response are closely tied to the wheel-and-tire package. The 2009 Mazda RX-8 uses radial tires in two primary sizes, with most sub-models on 225/45R18 and the R3 using 225/40R19. Available choices stay within a modern performance-oriented blackwall presentation, with BFGoodrich and Nitto options across several tire series. The key decision is confirming the exact sub-model and wheel diameter before comparing tire series, rim-width compatibility, and intended road use.
Which Tire Size Is Right for The 2009 Mazda RX-8
The 2009 Mazda RX-8 uses two primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Grand Touring, Sport, and Touring models use an 18-inch radial tire, while the R3 uses a 19-inch radial tire. Before selecting a tire, confirm which wheel package is on the car, especially if it has ever been modified or fitted with replacement wheels.
225/45R18 is a metric radial size in which 225 is the nominal section width in millimeters, 45 is the aspect ratio, R identifies radial construction, and 18 is the rim diameter in inches. On the 2009 Mazda RX-8, this size is the primary fitment for Grand Touring, Sport, and Touring sub-models, making it the main choice for most cars in this model year. Available options include BFGoodrich and Nitto products in blackwall form across g-Force and NT555 series. This size is the right place to focus if the car retains its 18-inch wheel setup and you want to compare performance-oriented street tires within the correct fitment.
225/40R19 is also a metric radial size, using the same 225-millimeter nominal width but a lower 40-series profile on a 19-inch rim. For the 2009 Mazda RX-8, this size applies to the R3, so it should not be treated as a universal fitment across the full model line. Product choices in this size center on BFGoodrich blackwall tires in performance-focused g-Force series. This is the size to evaluate when the car is an R3 or when the vehicle still carries its original 19-inch wheel diameter and compatible wheel width.
Sub-model fitment matters on the 2009 Mazda RX-8 because one version uses a different wheel and tire package. Most covered sub-models share the same 18-inch tire size, but the R3 moves to a 19-inch fitment, so identifying the exact trim is the first step before comparing tires.
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2009 Mazda RX-8 Grand Touring
The 2009 Mazda RX-8 Grand Touring uses the 225/45R18 radial tire size. Tire selection here is mainly about choosing among available blackwall performance tire series while confirming the wheel still matches the original 18-inch setup.
The 2009 Mazda RX-8 R3 uses the 225/40R19 radial tire size. That makes wheel diameter especially important, since this fitment differs from the other sub-models and should be verified before comparing available 19-inch tire options.
The 2009 Mazda RX-8 Sport uses the 225/45R18 radial tire size. Buyers with this sub-model can focus on comparing 18-inch blackwall performance tires and checking rim-width compatibility if the wheels have been changed.
The 2009 Mazda RX-8 Touring uses the 225/45R18 radial tire size. For this sub-model, the decision usually comes down to selecting the preferred tire series within the correct 18-inch fitment and confirming the car has not been converted to a different wheel package.
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 2009 Mazda RX-8 Tires for Sale
Available 2009 Mazda RX-8 tire choices center on 225/45R18 and 225/40R19 radial blackwall performance tires from BFGoodrich and Nitto. The main differences in the product grid are tire series and approved rim-width ranges, with 18-inch options offering the broader brand selection.
These FAQs focus on 2009 Mazda RX-8 tire size by sub-model, 18-inch versus 19-inch wheel fitment, available radial tire choices, and the basic inspection steps worth taking before regular road use or a longer drive.
Tire Size & Fitment
What tire size fits a 2009 Mazda RX-8?
The 2009 Mazda RX-8 uses two tire sizes depending on sub-model. Grand Touring, Sport, and Touring models use 225/45R18 radial tires, while the RX-8 R3 uses 225/40R19 radial tires. Both are modern metric radial sizes, but they are tied to different wheel diameters and should not be treated as interchangeable primary fitments.
The practical step is to confirm the exact trim and the actual wheels currently on the car before ordering tires. An RX-8 with replacement wheels may no longer match its original sub-model setup, so checking the sidewall size and wheel diameter on the vehicle helps avoid choosing the wrong fitment.
What size rim does a 2009 Mazda RX-8 use?
A 2009 Mazda RX-8 uses either an 18-inch or 19-inch rim, depending on sub-model. Grand Touring, Sport, and Touring models are matched to the 225/45R18 size on an 18-inch rim, while the R3 uses the 225/40R19 size on a 19-inch rim. Rim diameter is part of the tire size and must match exactly.
Wheel diameter is the first fitment detail to verify because a tire built for an 18-inch rim cannot be mounted on a 19-inch wheel, and the reverse is also true. It is also smart to check wheel width if the car has aftermarket wheels, since approved rim-width ranges vary by tire.
Do all 2009 Mazda RX-8 sub-models use the same tire size?
No. The 2009 Mazda RX-8 Grand Touring, Sport, and Touring use 225/45R18, while the 2009 Mazda RX-8 R3 uses 225/40R19. That means the model line does not share one universal tire size, even though all of the fitments are radial tires and both use a 225-millimeter nominal width.
That difference matters because the lower-profile 19-inch R3 fitment points to a different wheel package, not just a different tire label. Anyone replacing tires on a used RX-8 should check the sub-model and confirm the actual wheels on the car, especially if the vehicle has changed hands or has been modified.
Choosing the Right Tire
What should I consider when choosing a 225/45R18 tire for a 2009 Mazda RX-8?
Start with the correct fitment: 225/45R18 is the tire size used on the 2009 Mazda RX-8 Grand Touring, Sport, and Touring. From there, compare radial tire series, brand options, blackwall presentation, and approved rim-width ranges. BFGoodrich and Nitto both appear in this size, with performance-oriented street tire choices rather than appearance-driven collector styles.
The right selection depends on how the car is used and whether the wheel setup is still stock. Check the wheel width, confirm the tire matches the 18-inch rim, and compare details such as load figure and tire weight if those specifications matter to your intended road use and driving priorities.
What brands offer tires for the 2009 Mazda RX-8?
Tire choices for the 2009 Mazda RX-8 include BFGoodrich and Nitto, depending on size. The 225/45R18 fitment has options from both brands, while the 225/40R19 fitment shown here centers on BFGoodrich. All of the available products are radial blackwall tires aimed at modern street and performance-oriented use.
Brand is only one part of the decision, so it helps to compare series, wheel compatibility, and the exact size tied to your sub-model. An R3 owner should focus on the 19-inch fitment first, while owners of Grand Touring, Sport, and Touring models can compare a wider mix of 18-inch choices.
What tire series are available for the 2009 Mazda RX-8?
Available tire series for the 2009 Mazda RX-8 include 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 within the RX-8’s supported 225/45R18 and 225/40R19 fitments, with the broader series mix showing up in the 18-inch size.
Series names help separate one radial option from another when the size is already correct. Once the proper wheel diameter and tire size are confirmed, compare the series by their intended character, approved rim-width range, and other product details rather than assuming every tire in the same size will suit the car in exactly the same way.
Restoration & Appearance
Which tire should I choose for a period-style 2009 Mazda RX-8?
A period-style approach on a 2009 Mazda RX-8 starts with using the tire size that matches the car’s original wheel package for its sub-model. That means 225/45R18 for Grand Touring, Sport, and Touring, or 225/40R19 for the R3. The available choices shown here are modern radial blackwall performance tires, which suit the RX-8’s contemporary factory-era look.
For a cleaner factory-era presentation, focus less on dramatic appearance features and more on keeping the correct size, profile, and wheel diameter for the trim. That preserves the car’s intended visual stance better than mixing in a different diameter, even when the replacement tire still looks close at a glance.
Does correct tire fitment matter for a 2009 Mazda RX-8 restoration?
Yes, correct tire fitment matters because the 2009 Mazda RX-8 uses two distinct wheel-and-tire combinations across its sub-models. Using the right size helps preserve the proper relationship between the tire, the wheel opening, and the stance Mazda gave the car. On this model, that starts with matching the trim to either the 18-inch or 19-inch setup.
Restoration-minded buyers should verify the car’s actual wheels before choosing tires, since later wheel swaps can blur what belongs on a specific RX-8. If exact originality is a serious goal, checking marque-specific references and the vehicle’s own history is worthwhile before settling on a replacement tire series.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2009 Mazda RX-8?
Yes. A 2009 Mazda RX-8 may no longer match its original tire fitment if it has aftermarket wheels, suspension changes, or body modifications. The factory-type fitments here are 225/45R18 for Grand Touring, Sport, and Touring, and 225/40R19 for the R3. Any change in wheel diameter or width can alter which tires are actually appropriate on the car.
Before replacing tires, inspect the wheel size stamped on the wheel or read the current sidewall and compare that to the intended sub-model fitment. Steering clearance, fender clearance, and overall wheel width should also be checked when the car sits lower than stock or uses a non-original wheel package.
What should I inspect before driving a 2009 Mazda RX-8 on new tires?
Before putting regular road miles on a 2009 Mazda RX-8 with new tires, check that all four tires are the correct size for the sub-model, mounted on the correct rim diameter, and inflated properly for the vehicle’s setup. It is also wise to inspect the wheels for damage and make sure there is no rubbing at full steering lock.
A broader walk-around is just as important on a sports car that may sit for periods between drives. Look for uneven wear, loose lug hardware, suspension issues, and any signs of contact inside the wheel well. A short test drive followed by another quick inspection can help catch clearance or vibration issues early.
What should I check before a longer drive in a 2009 Mazda RX-8?
Before a longer drive, confirm that the 2009 Mazda RX-8 has the correct tire size for its wheel package, that tread and sidewalls are in good condition, and that there is no slow air loss. On a car like the RX-8, consistent tire condition matters because handling response and straight-line stability are closely tied to the condition of the tire set.
Take a little extra time to inspect for cracking, bulges, cuts, and irregular wear, especially on a vehicle that may spend time parked between outings. It also helps to recheck pressure after the car has been sitting and to look over the spare or emergency tire equipment so the car is better prepared for a longer trip.
