The 2018 Genesis G80 blends traditional rear-wheel-drive luxury-sedan proportions with modern performance-oriented chassis tuning, giving it a place between executive comfort and sport sedan response. In this generation, tire choice matters because the car can be fitted either with a square 18-inch setup on the G80 3.8 or a staggered 19-inch setup on the 5.0 and Sport 3.3T. That makes the first step identifying the exact sub-model and whether the car uses 245/45R18, 245/40R19 front, or 275/35R19 rear tires. Available choices center on blackwall radial performance tires from BFGoodrich and Nitto across several series. For replacement planning, match the tire size to the wheel setup already on the car and check carefully for any wheel or suspension changes.
Which Tire Size Is Right for The 2018 Genesis G80
Three tire sizes are used on the 2018 Genesis G80, and the right one depends on the exact sub-model and wheel setup. The G80 3.8 uses an 18-inch tire, while the 5.0 and Sport 3.3T use a staggered 19-inch arrangement with different front and rear sizes. Before choosing a tire, confirm both the sub-model and whether the car still has its original wheel diameter and front-to-rear fitment.
A 245/45R18 tire is a metric radial size with a 245-millimeter section width, a 45-series aspect ratio, and fitment for an 18-inch rim. On the 2018 Genesis G80, this size is used on the G80 3.8 and represents the square setup rather than a staggered front-and-rear arrangement. Available choices in this size include BFGoodrich and Nitto products, all in blackwall radial form, with series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2. This size is the right place to focus if the car is a 3.8 model still running 18-inch wheels.
A 245/40R19 tire uses the same 245-millimeter nominal width as the 18-inch size, but with a lower 40-series profile built for a 19-inch rim. On the 2018 Genesis G80, this is the front tire size for the 5.0 and Sport 3.3T staggered setup, so it should be treated as part of a matched front and rear combination. BFGoodrich offers several blackwall choices in this size, including g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A. Choose this size only after confirming the car is equipped with the 19-inch front wheel position.
A 275/35R19 tire is a wider metric radial size with a 275-millimeter section width, a 35-series profile, and fitment for a 19-inch rim. On the 2018 Genesis G80, this size is used on the rear of the staggered 19-inch setup found on the 5.0 and Sport 3.3T. Product choices include blackwall radial options from BFGoodrich and Nitto, with series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2. This size should be matched to the correct rear wheel position rather than selected as a universal G80 fitment.
Sub-model fitment matters on the 2018 Genesis G80 because tire size changes with both trim and wheel position. The G80 3.8 uses a single 18-inch size, while the 5.0 and Sport 3.3T use a staggered 19-inch front-and-rear combination that needs to be kept in order.
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2018 Genesis G80 3.8
The 2018 Genesis G80 3.8 uses a single 245/45R18 radial tire size. That makes selection more straightforward, with the main decisions centering on brand, tire series, and confirming that the car still carries its 18-inch wheel setup.
The front position on the 2018 Genesis G80 5.0 uses 245/40R19 radial tires. Tire replacement here should be treated as the front half of a staggered setup, so front tire selection needs to stay coordinated with the wider rear size and the existing 19-inch wheels.
The rear position on the 2018 Genesis G80 5.0 uses 275/35R19 radial tires. Because this is the wider rear component of a staggered arrangement, replacement should focus on preserving the correct rear size, wheel diameter, and overall front-to-rear setup.
The front position on the 2018 Genesis G80 Sport 3.3T uses 245/40R19 radial tires. That means tire selection should begin with the 19-inch front wheel fitment, then narrow down to the preferred performance-oriented series within that correct front size.
The rear position on the 2018 Genesis G80 Sport 3.3T uses 275/35R19 radial tires. Choosing a rear tire here means keeping the wider staggered rear fitment intact and confirming the wheel and suspension setup have not been changed from the intended 19-inch arrangement.
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 Genesis G80 Tires for Sale
Available 2018 Genesis G80 tires center on blackwall radial performance options from BFGoodrich and Nitto. Across the three fitment sizes, the main comparison points are tire series, wheel-width compatibility, and load-related specifications within the correct 18-inch or 19-inch application.
These FAQs focus on the exact tire sizes used on the 2018 Genesis G80, how sub-model and wheel position affect fitment, and what to compare before choosing replacement tires for regular road use.
Tire Size & Fitment
What tire size fits a 2018 Genesis G80?
The 2018 Genesis G80 uses three fitment sizes depending on sub-model and wheel position: 245/45R18, 245/40R19, and 275/35R19. The G80 3.8 uses 245/45R18, while the 5.0 and Sport 3.3T use a staggered 19-inch setup with 245/40R19 in front and 275/35R19 in the rear.
That means the right answer starts with identifying the exact version of the car and checking whether it still has the same wheel package. A G80 with changed wheels, replacement rims, or mixed tire sizes should be measured carefully before ordering, especially on the staggered 19-inch cars where front and rear sizes are not interchangeable.
What size rim does a 2018 Genesis G80 use?
The 2018 Genesis G80 uses either 18-inch or 19-inch rims, depending on the sub-model and tire size. The G80 3.8 is paired with an 18-inch rim through its 245/45R18 tire size, while the 5.0 and Sport 3.3T use 19-inch rims with 245/40R19 front and 275/35R19 rear tires.
Rim diameter should be confirmed before selecting tires because a 245-width tire in 18-inch form is not the same fitment as a 245-width tire in 19-inch form. On a used G80, it is also worth checking wheel width and verifying whether aftermarket wheels changed the original front-to-rear arrangement.
Why does the 2018 Genesis G80 have more than one tire size?
The 2018 Genesis G80 has more than one tire size because its fitment changes by sub-model, and some versions use a staggered setup. The G80 3.8 uses one 18-inch size at all four corners, while the 5.0 and Sport 3.3T use one 19-inch size in front and a wider 19-inch size in the rear.
That distinction affects both replacement planning and tire rotation expectations. A square setup gives a simpler replacement path, but a staggered arrangement requires the correct front and rear sizes to stay in their intended positions. Buyers should confirm trim level, wheel diameter, and axle position before narrowing choices by brand or tire series.
Choosing the Right Tire
What should I consider when choosing a tire for a 2018 Genesis G80?
Start with the correct size for the exact G80 configuration, then compare the available radial options by tire series, rim-width specification, and load-related details where they are stated. The 3.8 uses 245/45R18, while the 5.0 and Sport 3.3T require 245/40R19 front and 275/35R19 rear fitments.
After size is settled, the decision becomes more about how the car is used and what kind of replacement character you want from the tire lineup available. A G80 driven primarily on the street may lead to one series choice, while a buyer focused on matching a staggered performance-oriented setup may compare another within the same correct size.
What sidewall styles are available for 2018 Genesis G80 tires?
The available tires for the 2018 Genesis G80 are blackwall radial designs across all three fitment sizes. That keeps the appearance modern and straightforward, whether the car uses the 18-inch square setup or the 19-inch staggered arrangement on the 5.0 and Sport 3.3T.
Since sidewall treatment is consistent here, most of the visible and functional differences come from tire series rather than decorative sidewall styling. Buyers comparing options should spend more time on the correct size, wheel-width compatibility, and the intended use of the car than on appearance differences between sidewall formats.
What brands offer tires for the 2018 Genesis G80?
BFGoodrich and Nitto both offer applicable tire choices for the 2018 Genesis G80, depending on size. BFGoodrich appears across all three fitments with several g-Force series, while Nitto is available in 245/45R18 and 275/35R19 through the NT555 G2 line.
Brand choice should come after the fitment basics are confirmed. Once the exact G80 sub-model, axle position, and wheel diameter are established, the useful comparison becomes which series is offered in that size and whether the tire's width range and other specifications match the wheel and driving setup already on the car.
Restoration & Appearance
Does correct tire fitment matter for a 2018 Genesis G80 restoration or refurbishment?
Yes, correct tire fitment still matters on a 2018 Genesis G80 even though it is a modern luxury sport sedan rather than an older collector-era car. The difference between the 18-inch square setup and the 19-inch staggered setup changes the car's visual stance and keeps the intended front-to-rear proportion intact.
A refurbishment-minded owner should begin by matching the car's existing wheel diameter and confirming whether it is a 3.8, 5.0, or Sport 3.3T configuration. That preserves the proper overall presentation more effectively than choosing a tire by width alone, since the same nominal width can appear on different rim diameters and in different axle positions.
How does tire construction affect the appearance of a refurbished 2018 Genesis G80?
Tire construction is straightforward on the 2018 Genesis G80 because the applicable fitments are all radial. The appearance difference therefore comes less from bias-ply versus radial construction and more from keeping the correct 18-inch or staggered 19-inch sizing that suits the car's original visual balance.
For a clean, proper-looking refurbishment, the more important choices are tire size, front-to-rear proportion, and consistent blackwall presentation. A G80 with the wrong rim diameter or an incorrect rear width can look noticeably out of proportion, even if the tire itself is a quality radial in a similar overall performance category.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Genesis G80?
Yes, modifications can affect tire fitment on a 2018 Genesis G80. Wheel changes, altered offsets, suspension lowering, alignment changes, or body modifications can all change how a 245/45R18, 245/40R19, or 275/35R19 tire sits in the wheel opening and whether it maintains proper clearance.
A used G80 should be checked carefully if it has aftermarket wheels or any change from stock ride height. Confirm the actual rim diameter and wheel width first, then inspect front steering clearance and rear fender room before settling on replacement tires, especially on the staggered 19-inch setup where the wider rear size leaves less room for assumptions.
What should I inspect before driving a 2018 Genesis G80 on new tires?
Before driving a 2018 Genesis G80 on new tires, inspect the wheels for damage, confirm the tire sizes match the car's exact sub-model setup, and check that inflation is set correctly for the installed tires and vehicle use. It is also smart to verify that the front and rear sizes are not accidentally reversed on staggered 19-inch applications.
A short follow-up check after the first miles is worthwhile on any G80. Look for rubbing marks, uneven shoulder contact, vibration, air loss, or any sign that an aftermarket wheel width or offset is affecting fitment. Catching those issues early helps prevent irregular wear and keeps the car's steering and ride behavior more consistent.
How often should tires on a 2018 Genesis G80 be inspected?
Tires on a 2018 Genesis G80 should be inspected regularly, not just when tread looks low. Frequent checks for pressure loss, uneven wear, cuts, bulges, and sidewall damage are especially important on performance-oriented low-profile sizes such as 245/40R19 and 275/35R19, where road impacts can be harder on both tires and wheels.
Inspection intervals should become even more frequent if the car sees spirited driving, rough pavement, or long periods of storage between trips. A G80 that is driven less often can still develop age-related issues, so keeping an eye on tire condition, wheel condition, and visible wear patterns is just as important as monitoring mileage.
