The 2018 Mazda 6 sits in the later phase of Mazda’s midsize sedan development, where sharper styling and a more driver-focused character helped separate it from more ordinary family cars. Buyers looking at this exact model usually need to confirm trim first, because the 2018 Mazda 6 uses either 225/45R19 or 225/55R17 radial tires depending on sub-model. That makes wheel diameter the first fitment checkpoint before comparing actual tire choices. From there, selection comes down to the kind of look and use you want, including sport-oriented blackwall options and, in 17-inch fitment, more traditional sidewall treatments. The right choice should match the car’s trim, wheel setup, and intended road use.
Which Tire Size Is Right for The 2018 Mazda 6
The 2018 Mazda 6 uses two primary tire sizes, and the difference comes down to sub-model and wheel diameter. Some trims use a 225/45R19 radial on a 19-inch rim, while others use a 225/55R17 radial on a 17-inch rim. Before choosing a tire, identify the exact trim and confirm which wheel diameter is currently on the car, especially if the wheels have ever been changed.
Fit(s): Grand Touring, Grand Touring Reserve, Signature, and Touring
Construction: Radial|Rim: 19 in
225/45R19 is a modern metric radial size in which 225 is the nominal section width in millimeters, 45 is the aspect ratio, R indicates radial construction, and 19 is the rim diameter in inches. On the 2018 Mazda 6, this size is used on trims equipped with 19-inch wheels, making wheel confirmation essential before purchase. Available choices in this size center on BFGoodrich blackwall performance-oriented series such as g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A. This size makes sense when the car retains its 19-inch setup and the goal is to match the trim’s original wheel diameter with a modern radial tire.
225/55R17 is a modern metric radial size with a 225-millimeter nominal section width, a 55-series profile, radial construction, and fitment for a 17-inch rim. On the 2018 Mazda 6, this size belongs to trims using 17-inch wheels, so it should be selected only after verifying the actual wheel diameter on the car. Product choices are broader here, including BFGoodrich g-Force performance-style blackwalls as well as Silvertown Radial options in wide whitewall and redline sidewall treatments. This size is worth evaluating carefully if appearance matters as much as basic fitment, since the available sidewall styles create a very different visual presentation.
Tire fitment on the 2018 Mazda 6 varies by sub-model, so the exact trim matters before choosing a replacement. Most covered trims use the 19-inch fitment, while the Sport uses the 17-inch size, making wheel diameter and trim identification the two key checks.
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2018 Mazda 6 Grand Touring
The 2018 Mazda 6 Grand Touring uses the 225/45R19 radial tire size. Tire selection for this trim starts with confirming the 19-inch wheel setup, then comparing blackwall radial options within that size for the driving character and specifications that suit the car.
The 2018 Mazda 6 Grand Touring Reserve uses the 225/45R19 radial tire size. That keeps the decision focused on 19-inch radial tire choice rather than size conversion, with attention to wheel compatibility and the product differences available within that fitment.
The 2018 Mazda 6 Signature uses the 225/45R19 radial tire size. Owners of this trim should verify that the car still carries its 19-inch wheels, then compare the available blackwall radial options by series and specifications rather than looking for a different primary size.
The 2018 Mazda 6 Sport uses the 225/55R17 radial tire size. That opens the door to both blackwall performance-style radials and more appearance-driven 17-inch options such as wide whitewall or redline treatments, provided the wheel setup remains unchanged.
The 2018 Mazda 6 Touring uses the 225/45R19 radial tire size. For this trim, the main choice is among available 19-inch radial tires in the correct size, with wheel diameter confirmation especially important if the car has ever been fitted with aftermarket wheels.
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 2018 Mazda 6 Tires for Sale
Available 2018 Mazda 6 tire choices center on BFGoodrich radial products in both primary sizes. The 19-inch fitment stays focused on blackwall g-Force series, while the 17-inch fitment adds Silvertown Radial options with wide whitewall and redline sidewall treatments.
These FAQs cover the main tire questions for the 2018 Mazda 6, including trim-based size differences, 17-inch versus 19-inch wheel fitment, available radial tire styles, and the maintenance checks that matter before regular road use.
Tire Size & Fitment
What tire size fits a 2018 Mazda 6?
A 2018 Mazda 6 uses either 225/45R19 or 225/55R17 tires, depending on the sub-model. Grand Touring, Grand Touring Reserve, Signature, and Touring use 225/45R19, while the Sport uses 225/55R17. Both are radial tire fitments, but they are built around different wheel diameters.
The important next step is confirming the exact trim and the actual wheels on the car. A Mazda 6 with replacement wheels may no longer match its original trim-based tire size, so checking the current rim diameter before selecting a tire prevents ordering a 17-inch tire for a 19-inch wheel, or the other way around.
What size rim does a 2018 Mazda 6 use?
The 2018 Mazda 6 uses either a 19-inch or 17-inch rim, depending on trim. The 225/45R19 tire belongs with a 19-inch rim, and the 225/55R17 tire belongs with a 17-inch rim. That makes rim diameter one of the most important parts of correct replacement fitment on this model.
Rim diameter should be checked on the wheel itself rather than assumed from the model year alone. Cars with aftermarket wheels, winter wheel packages, or previous owner changes may not still carry their original setup, and the correct tire size must match the wheel diameter before any other comparison such as series, sidewall style, or load specification.
Do all 2018 Mazda 6 sub-models use the same tire size?
No, 2018 Mazda 6 sub-models do not all use the same tire size. The Sport uses 225/55R17, while the Touring, Grand Touring, Grand Touring Reserve, and Signature use 225/45R19. The difference is tied directly to wheel diameter, so trim identification matters before choosing a tire.
That distinction affects more than the numbers on the sidewall. It changes the wheel size you need, the product selection available, and even the appearance options, since the 17-inch fitment includes whitewall and redline choices that are not present in the 19-inch fitment. Trim and wheel confirmation should come before comparing brands or tire series.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Mazda 6?
Start with the correct size for the exact trim and wheel diameter: 225/45R19 for Touring, Grand Touring, Grand Touring Reserve, and Signature, or 225/55R17 for Sport. From there, compare radial tire series, rim-width compatibility, and any load information that appears on the tire you are considering.
The right choice depends on how the car is used and how you want it to look. A blackwall g-Force series tire gives the Mazda 6 a modern, performance-oriented presentation, while some 17-inch options add a more custom or traditional appearance. Matching the tire to the wheel, intended use, and visual style usually matters more than choosing by name alone.
What sidewall styles are available for 2018 Mazda 6 tires?
Sidewall choices for the 2018 Mazda 6 include blackwall, wide whitewall, and redline, though they are not available across both primary sizes in the same way. The 19-inch 225/45R19 fitment appears in blackwall form, while the 17-inch 225/55R17 fitment includes blackwall, wide whitewall, and redline options.
That means sidewall style can influence whether a buyer stays with the existing wheel package or considers a different setup. Anyone focused on a sport sedan appearance will usually stay with blackwall tires, while a more custom look is possible in the 17-inch size. Sidewall style should always come after confirming the correct trim and wheel diameter.
What tire series are available for the 2018 Mazda 6?
The 2018 Mazda 6 is offered in several BFGoodrich tire series, including g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and Silvertown Radial. The 19-inch fitment centers on the g-Force family, while the 17-inch fitment includes both g-Force choices and Silvertown Radial options.
Those series differences matter because they shape what can actually be compared in the correct size. Some buyers will be looking for a straightforward blackwall radial, while others may want the visual distinction of a wide whitewall or redline in 17-inch form. The best comparison is made after the correct size has already been confirmed.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Mazda 6?
A period-style approach on a 2018 Mazda 6 usually starts with keeping the original trim-based tire size and wheel diameter intact. For most trims that means 225/45R19 with a blackwall radial look, while the Sport uses 225/55R17 and allows a broader range of appearance choices within that size.
Because this is a modern sedan rather than a vintage restoration subject, appearance usually revolves around preserving the car’s intended stance and wheel relationship instead of recreating an older-era tire style. Staying with the original size is the cleanest starting point, then choosing a sidewall treatment that fits the car’s character without creating a mismatched look.
How does tire construction affect the appearance of a restored 2018 Mazda 6?
Tire construction is straightforward on the 2018 Mazda 6 because both primary fitments are radial. The visual difference comes less from bias-ply versus radial appearance and more from tire series and sidewall treatment, especially on the 17-inch size where blackwall, wide whitewall, and redline options change the car’s presentation noticeably.
On a modern Mazda 6, appearance is usually strongest when the tire still looks proportional to the wheel and trim level. A 19-inch setup tends to support a contemporary sport-sedan look, while a 17-inch setup offers more room for sidewall styling. Keeping the correct size for the trim helps maintain that balance better than chasing an unrelated visual theme.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Mazda 6?
Yes, modifications can affect tire fitment on a 2018 Mazda 6 even when the tire size itself appears close to stock. Changes such as aftermarket wheels, different wheel widths, altered offsets, suspension lowering, or body modifications can change how a 225/45R19 or 225/55R17 tire sits in the wheel opening.
A car that no longer has its original wheel and suspension setup should be checked for clearance at full steering lock and through suspension movement before replacing tires. Measuring the current wheel diameter and width is especially important, since trim-based fitment only helps if the Mazda 6 still carries the wheel package that matches its original configuration.
What should I inspect before driving a 2018 Mazda 6 on new tires?
Before driving a 2018 Mazda 6 on new tires, inspect the wheels for correct diameter and condition, verify that all four tires are the intended size for the car’s setup, and make sure inflation is set appropriately for the installed tires. It also helps to look over valve stems, lug torque, and general tread and sidewall condition.
A short initial road check can reveal rubbing, vibration, or steering pull before the car goes into regular service. Uneven wear on the old tires may also point to alignment or suspension issues that should be corrected so the new tires wear evenly. Catching those problems early protects both fitment and long-term tire life.
How often should tires on a 2018 Mazda 6 be inspected?
Tires on a 2018 Mazda 6 should be inspected regularly, not just when tread looks low. A quick visual check every month and before longer drives helps catch air loss, cuts, punctures, sidewall damage, or uneven wear patterns on either the 225/45R19 or 225/55R17 fitment before they turn into larger problems.
Cars that are driven less often still need attention because tire aging, pressure loss, and flat spotting can develop during storage. Looking at tread wear across the full width of the tire also helps reveal alignment or suspension concerns. Consistent inspections are especially useful on this model because trim-based wheel differences make correct replacement more important.
