The 2018 Kia Cadenza sits in the full-size sedan class with a strong emphasis on comfort, quiet highway travel, and upscale road manners. For owners keeping one in original-style trim or simply replacing worn tires with the correct fitment, the key detail is that this model uses radial tires in two distinct sizes: 245/45R18 and 245/40R19. That makes wheel diameter and sub-model identification especially important before choosing a replacement. Available options stay firmly in modern blackwall performance-touring territory, with BFGoodrich and Nitto choices in several series. The right selection comes down to matching the car's exact wheel setup, intended ride character, and overall appearance.
Which Tire Size Is Right for The 2018 Kia Cadenza
The 2018 Kia Cadenza uses two primary tire sizes, and the difference comes down to sub-model and wheel diameter. Some versions use 245/45R18 on an 18-inch rim, while others use 245/40R19 on a 19-inch rim, so the first step is confirming the exact trim and the wheels currently on the car before choosing a tire.
A 245/40R19 tire is a metric radial size with a 245-millimeter section width, a 40-series aspect ratio, and fitment for a 19-inch wheel. On the 2018 Kia Cadenza, this size serves trims equipped with the larger wheel package and keeps the car in a modern low-profile radial format. Available choices are blackwall tires from BFGoodrich in the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A lines. This size is the one to evaluate when maintaining the factory wheel diameter and a more contemporary, sport-oriented tire profile.
A 245/45R18 tire is a metric radial size that uses the same 245-millimeter section width but pairs it with a 45-series profile on an 18-inch wheel. For the 2018 Kia Cadenza, this size applies to trims fitted with 18-inch rims and gives buyers a different wheel-and-tire combination than the 19-inch setup. Product choices include blackwall tires from BFGoodrich and Nitto across several series, including g-Force Sport Comp 2, g-Force Comp 2 AS, g-Force Phenom T/A, and NT555 G2. This is the size to confirm when the car retains 18-inch wheels or has a trim that was equipped that way.
Tire fitment on the 2018 Kia Cadenza is trim-sensitive rather than universal across the lineup. Checking whether the car is a Limited, Premium, or Technology model matters because wheel diameter and tire size can change with the sub-model and current wheel setup.
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2018 Kia Cadenza Limited
The 2018 Kia Cadenza Limited uses the 245/40R19 radial size. That points the tire search toward 19-inch blackwall replacement options, making wheel confirmation the first step before comparing series and performance-focused product differences.
The 2018 Kia Cadenza Premium uses the 245/45R18 radial size. Tire selection here centers on 18-inch fitment, where buyers can compare BFGoodrich and Nitto options while keeping rim compatibility and intended road use in mind.
The 2018 Kia Cadenza Technology can be found with either 245/40R19 or 245/45R18 radial tires. That makes the actual wheel diameter on the car more important than the trim badge alone when narrowing the correct replacement 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 2018 Kia Cadenza Tires for Sale
Available 2018 Kia Cadenza tires focus on modern radial blackwall fitments in 245/40R19 and 245/45R18. Buyers can compare BFGoodrich and Nitto offerings across several series, with differences in rim-width compatibility, load figures, and overall tire character.
These FAQs focus on the exact tire sizes used on the 2018 Kia Cadenza, how trim level affects fitment, and what to compare when choosing between 18-inch and 19-inch radial replacements.
Tire Size & Fitment
What tire size fits a 2018 Kia Cadenza?
The 2018 Kia Cadenza uses two tire sizes: 245/45R18 and 245/40R19. Both are radial fitments, but they do not apply universally across every version of the car. The Premium uses 245/45R18, the Limited uses 245/40R19, and the Technology can appear with either size depending on the wheel setup.
That means the correct starting point is identifying the exact trim and confirming the wheel diameter actually installed on the car. A Technology model especially deserves a close check, since it can use either 18-inch or 19-inch wheels. The tire placard, current tire size, and wheel markings are all worth verifying before replacement.
What size rim does a 2018 Kia Cadenza use?
A 2018 Kia Cadenza uses either an 18-inch or 19-inch rim, depending on the tire size and sub-model. The 245/45R18 tire fits an 18-inch rim, while the 245/40R19 tire fits a 19-inch rim. Both setups are part of the Cadenza fitment range for this model year.
Rim diameter is the most important detail to confirm because an 18-inch tire cannot be mounted on a 19-inch wheel, and vice versa. Wheel width matters too when comparing replacement tires, since the available products have different approved rim-width ranges. Checking both diameter and width helps narrow the right tire much faster.
Do all 2018 Kia Cadenza sub-models use the same tire size?
No, 2018 Kia Cadenza sub-models do not all use the same tire size. The Limited uses 245/40R19, the Premium uses 245/45R18, and the Technology may use either size. Fitment is tied to the wheel package rather than being shared across the full Cadenza lineup.
That matters any time the car is being purchased used or has had wheels changed during ownership. A trim badge alone is helpful, but the actual wheel diameter on the car should still be checked before selecting tires. Looking at the current tire sidewall is often the quickest way to confirm which fitment the car needs.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Kia Cadenza?
Start with the correct size for the exact car: 245/45R18 or 245/40R19. From there, compare radial construction details that matter to the way the car is used, including rim-width compatibility, load figures where stated, and whether the tire series leans more toward all-season versatility or a more performance-focused character.
The Cadenza is a large sedan, so a replacement tire should match the wheel setup and the owner's priorities rather than just the sidewall size. Highway use, wet-weather driving, and ride expectations can all shape the choice. It also helps to compare the current tires on the car if the goal is to preserve its existing road feel.
What brands offer tires for the 2018 Kia Cadenza?
Tires for the 2018 Kia Cadenza are available from BFGoodrich and Nitto in the sizes used on this model. BFGoodrich appears in both 245/40R19 and 245/45R18, while Nitto is available in 245/45R18. All of the available choices here are radial blackwall tires.
Brand choice is only one part of the decision, so it helps to compare the specific series offered within the correct size. A Cadenza owner should also look at wheel diameter, approved rim-width range, and load capacity where shown. Staying inside the proper fitment matters more than choosing a brand name first.
What tire series are available for the 2018 Kia Cadenza?
The 2018 Kia Cadenza is served by several tire series, including BFGoodrich g-Force Sport Comp 2, BFGoodrich g-Force Comp 2 AS, BFGoodrich g-Force Phenom T/A, and Nitto NT555 G2. Series availability depends on whether the car uses 245/40R19 or 245/45R18, so the exact size still comes first.
Comparing tire series is useful because it gives a clearer picture of the product's intended character than size alone. Some owners may want a more everyday all-season style of replacement, while others may prefer a more performance-oriented presentation. Once the correct size and rim setup are confirmed, the series comparison becomes much more meaningful.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Kia Cadenza?
A period-style approach on a 2018 Kia Cadenza starts with keeping the correct original-type wheel diameter and the matching tire size already used on that trim, either 245/45R18 or 245/40R19. Since the available options are modern radial blackwall tires, the visual direction stays clean, contemporary, and close to the car's original-era presentation.
For an owner who wants the sedan to look right without chasing unnecessary visual changes, the best move is usually to avoid altering wheel diameter or moving to a dramatically different tire profile. Comparing blackwall series within the proper size keeps the car looking consistent while still allowing some choice in tire character and specification.
Does correct tire fitment matter for a 2018 Kia Cadenza restoration or preservation project?
Yes, correct tire fitment matters on a 2018 Kia Cadenza even in a preservation-focused project. Using the proper 18-inch or 19-inch size helps maintain the car's intended stance, wheel-to-tire proportion, and overall presentation. It also keeps the visual relationship between wheel opening, sidewall height, and wheel diameter in the range the car was designed around.
A later-model collector sedan can lose its original look quickly if replacement tires stray too far from the proper size or wheel package. Owners trying to preserve a stock appearance should confirm the trim, wheel diameter, and current fitment before purchasing. That approach supports both appearance and day-to-day practicality without turning the choice into guesswork.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Kia Cadenza?
Yes, modifications can affect tire fitment on a 2018 Kia Cadenza. Wheel changes, different offsets, suspension lowering, or non-stock tire sizes can all alter the space available around the fenders and steering components. Even when the tire size matches one of the Cadenza's original fitments, an altered wheel setup can change the result.
A used car should never be assumed to retain its original wheel package, especially if it already wears aftermarket wheels. Checking current tire size, wheel diameter, wheel width, and visible clearance before replacement helps avoid ordering around the wrong setup. The more the car differs from stock, the more important those measurements become.
What should I inspect before driving a 2018 Kia Cadenza on new tires?
Before driving a 2018 Kia Cadenza on new tires, confirm that the size matches the car's wheel diameter and that each tire is seated and inflated properly. It is also smart to inspect the wheels for damage and make sure the tires clear the fenders, suspension, and steering components through normal movement.
A careful walkaround after installation can catch rubbing, uneven spacing, or obvious air loss before the car goes back into regular service. Lug torque, alignment condition, and valve stem condition are also worth checking, especially on a sedan that may spend long stretches on the highway. A correct tire still needs a sound wheel and chassis setup.
How often should tires on a 2018 Kia Cadenza be inspected?
Tires on a 2018 Kia Cadenza should be inspected regularly rather than only when replacement time arrives. Pressure, tread wear, sidewall condition, and any signs of cuts, bulges, or repeated air loss all deserve routine attention. That matters whether the car is a daily driver or a lower-mileage sedan that spends more time parked.
Collector and lightly used cars can develop tire issues from age and storage even when tread still looks acceptable. Looking over the tires before longer trips is especially worthwhile, since a full-size sedan often sees sustained highway use. Consistent inspections also make it easier to spot alignment problems or suspension wear before they damage a new set.
