The 2004 Mazda Miata sits in the late NB era, when Mazda’s lightweight roadster formula was still centered on compact dimensions, quick responses, and a strong connection between steering feel and chassis balance. That makes tire choice especially important on this car, because the right size supports both the look and the handling character owners expect. A 2004 Mazda Miata uses either 205/45R16 or 205/40R17 radial tires, depending on the sub-model. Available choices stay within a modern performance-oriented radial category, with differences in tire series and sidewall treatment rather than a shift between bias-ply and radial construction. The key step is matching the exact sub-model and wheel diameter before comparing tire options.
Which Tire Size Is Right for The 2004 Mazda Miata
Two primary tire sizes apply to the 2004 Mazda Miata, and the right one depends on the specific sub-model and wheel diameter. Base and LS models use a 16-inch setup with 205/45R16 tires, while the Mazdaspeed model uses a 17-inch setup with 205/40R17 tires. The first step is confirming which Miata version and wheel size the car actually has before comparing tire series, sidewall style, or load-related specifications.
In 205/45R16, the 205 refers to the tire’s nominal section width in millimeters, 45 is the aspect ratio, R identifies radial construction, and 16 is the wheel diameter in inches. This is a modern metric radial size used on 16-inch-wheel 2004 Miata applications, giving the car a low-profile fitment suited to its responsive roadster character. Available choices include BFGoodrich options in the g-Force Sport Comp 2 and g-Force Comp 2 AS series, with Blackwall and RBL sidewall treatments. It is the size to evaluate for Base and LS fitment after confirming the wheels remain stock in diameter and width.
In 205/40R17, the 205 is the nominal section width in millimeters, 40 is the aspect ratio, R means radial construction, and 17 marks the wheel diameter in inches. This modern metric radial size belongs to the 17-inch-wheel Miata application and keeps a low-profile performance look appropriate to that setup. BFGoodrich choices in this size include the g-Force Sport Comp 2 and g-Force Phenom T/A, both offered with Blackwall styling. This is the size to focus on for the Mazdaspeed model, with wheel diameter and wheel-width compatibility checked before choosing among the available tires.
Tire fitment for the 2004 Mazda Miata is straightforward once the sub-model is confirmed, but the covered versions do not all share the same size. Base and LS models use one tire size, while the Mazdaspeed uses a different size on a different wheel diameter, so identifying the exact car matters before selection.
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2004 Mazda Miata Base
The 2004 Mazda Miata Base uses the 205/45R16 radial tire size. That keeps the decision centered on choosing the right 16-inch radial option for the car’s wheels, intended road use, and preferred sidewall or tire-series presentation.
The 2004 Mazda Miata LS also uses the 205/45R16 radial tire size. Owners can concentrate on comparing available 16-inch radial choices rather than sorting through multiple primary fitments, while still confirming that the car has not been changed to a different wheel package.
The 2004 Mazda Miata Mazdaspeed uses the 205/40R17 radial tire size. Tire selection therefore starts with the 17-inch wheel setup, followed by a comparison of the available radial series and the wheel-width specifications tied to that size.
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 Mazda Miata Tires for Sale
Available 2004 Mazda Miata tire choices center on BFGoodrich radial performance tires in the 205/45R16 and 205/40R17 sizes. Buyers can compare g-Force series options, Blackwall or RBL sidewall treatments, and wheel-width specifications that vary by application.
These 2004 Mazda Miata FAQs focus on exact tire size by sub-model, 16-inch versus 17-inch wheel fitment, available radial tire choices, appearance differences in sidewall treatment, and the checks worth making before road use.
Tire Size & Fitment
What tire size fits a 2004 Mazda Miata?
A 2004 Mazda Miata uses one of two radial tire sizes: 205/45R16 or 205/40R17. The Base and LS models use 205/45R16, while the Mazdaspeed model uses 205/40R17. Those sizes are tied to different wheel diameters, so they are not just alternate ways of expressing the same fitment.
The practical step is to confirm the exact sub-model and the wheels currently on the car before ordering tires. Many Miatas have seen wheel changes over the years, and a 16-inch Base or LS setup should not be treated the same as a 17-inch Mazdaspeed setup without checking the actual rim diameter and wheel width.
What size rim does a 2004 Mazda Miata use?
A 2004 Mazda Miata uses either a 16-inch or 17-inch rim, depending on the sub-model. Base and LS fitments use the 205/45R16 size on a 16-inch rim, while the Mazdaspeed uses 205/40R17 on a 17-inch rim. Rim diameter is built directly into the last number of each tire size.
Wheel diameter should be verified before focusing on tread pattern or tire series, because a 16-inch tire cannot be mounted on a 17-inch wheel and vice versa. It is also worth checking wheel width, especially if the car has aftermarket wheels, since tire options in these sizes carry their own recommended rim-width ranges.
Do all 2004 Mazda Miata sub-models use the same tire size?
No. The 2004 Mazda Miata Base and LS share the 205/45R16 radial size, but the Mazdaspeed uses 205/40R17. That means the covered sub-models do not all use the same wheel diameter or the same primary tire fitment.
That difference matters because tire selection starts with the correct sub-model, not just the model name. A buyer looking at a Miata with unknown wheel history should confirm whether it is a Base, LS, or Mazdaspeed and then inspect the wheels on the car, since later wheel swaps can blur the line between original sub-model fitment and current setup.
Choosing the Right Tire
What should I consider when choosing a 205/45R16 tire for a 2004 Mazda Miata?
For a 2004 Mazda Miata using 205/45R16, the first priorities are staying with the correct size and confirming the wheel matches the tire’s intended rim-width range. In this size, BFGoodrich options include g-Force Sport Comp 2 and g-Force Comp 2 AS tires, with Blackwall and RBL sidewall treatments.
Once the size is settled, the decision becomes one of tire character and presentation. A buyer may prefer a cleaner black sidewall look or an RBL treatment, and it is worth comparing load-related specifications where they are given, especially if the car sees regular road use rather than occasional pleasure driving.
What sidewall styles are available for 2004 Mazda Miata tires?
Sidewall treatment varies by size and product. In 205/45R16, available options include Blackwall and RBL. In 205/40R17, the available products use a Blackwall sidewall. That means appearance choice is broader on the 16-inch Miata fitment than on the 17-inch Mazdaspeed-style fitment.
Sidewall style does not change the tire size requirement, but it can noticeably affect the car’s visual presentation. A clean Blackwall keeps a simple modern look, while RBL offers a different sidewall accent, so owners of Base and LS models can factor appearance into the decision after confirming the correct 16-inch tire size.
What tire series are available for the 2004 Mazda Miata?
The 2004 Mazda Miata tire options here come from BFGoodrich and include the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A series. The exact series available depends on tire size, with the 16-inch and 17-inch applications not sharing the exact same product mix.
Series selection is useful when comparing how closely a tire matches the car’s intended use and presentation. It still comes after the fitment basics, since choosing between series only makes sense once the Miata’s sub-model, wheel diameter, and the correct primary size have already been confirmed.
Restoration & Appearance
Which tire should I choose for a period-style 2004 Mazda Miata?
A period-style 2004 Mazda Miata tire choice starts with the correct original-format size for the specific sub-model: 205/45R16 for Base and LS, or 205/40R17 for Mazdaspeed. Since these are modern radial sizes, the appearance decision is less about bias-ply versus radial and more about tire series and sidewall treatment.
Keeping the proper wheel diameter and low-profile sizing does the most to preserve the car’s intended stance. Owners seeking a more era-appropriate look can compare Blackwall and RBL options where available, while anyone pursuing strict originality should also check marque-specific references for the exact appearance details used on their car.
How does tire construction affect the appearance of a restored 2004 Mazda Miata?
On a 2004 Mazda Miata, construction is straightforward because the primary fitments are radial tires. That means the appearance difference comes mainly from the tire’s profile, sidewall styling, and overall presentation on the correct 16-inch or 17-inch wheel rather than from choosing between bias-ply and radial construction.
A restored Miata generally looks most cohesive when the tire size matches the proper sub-model and the sidewall profile stays true to the car’s original low-profile character. Details such as Blackwall versus RBL can subtly change the finished look, so appearance-minded owners should compare those visual cues along with the right tire series.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2004 Mazda Miata?
Yes. A 2004 Mazda Miata may no longer have its original wheels, and changes to wheel diameter, wheel width, offset, ride height, or suspension components can all affect tire fitment. That matters even when the car is still using one of the correct factory-associated sizes such as 205/45R16 or 205/40R17.
A modified Miata should be checked for inner clearance, fender clearance, and steering clearance before any tire decision is treated as settled. The safest approach is to verify the actual wheel dimensions on the car and compare them to the tire’s intended rim-width range instead of assuming the model name alone tells the whole story.
What should I inspect before driving a 2004 Mazda Miata on new tires?
Before driving a 2004 Mazda Miata on new tires, inspect wheel condition, valve stems, lug hardware, and basic clearance at the suspension and fenders. Tire pressure should be set correctly for the vehicle’s setup, and each tire should be checked for proper seating and any sign of rubbing once mounted.
It also helps to look beyond the tires themselves. A Miata that has worn shocks, alignment issues, or old suspension bushings may not make the most of a fresh set of radials, so a short follow-up inspection after the first miles can catch uneven wear, unexpected contact, or pressure loss before they become larger problems.
How should 205/45R16 and 205/40R17 tires on a collector 2004 Mazda Miata be maintained?
Collector-use tires on a 2004 Mazda Miata should be maintained with regular pressure checks, visual inspections, and attention to age as well as tread depth. Both 205/45R16 and 205/40R17 are low-profile radial sizes, so sidewall condition, puncture damage, and slow air loss deserve close attention on cars that are driven infrequently.
Storage conditions matter almost as much as mileage on a lightly used roadster. Keeping the car away from prolonged sunlight, heat, moisture, and ozone sources helps protect the tires, and it is wise to inspect for flat spotting, cracking, or uneven wear before longer drives, especially after the car has been parked for extended periods.
