The 2025 Lexus IS300 carries forward the compact sport-sedan formula with a chassis and profile that still place an emphasis on balance, crisp road manners, and an upscale everyday driving character. Tire selection on this car matters because fitment changes with configuration, moving from 18-inch 235/45R18 sizing on standard AWD and RWD models to 19-inch 235/40R19 and 265/35R19 fitments on premium and F Sport applications. All primary fitments are radial, so the decision is less about vintage construction and more about confirming the exact sub-model, wheel diameter, and front or rear position before comparing available blackwall performance-oriented choices.
Which Tire Size Is Right for The 2025 Lexus IS300
The 2025 Lexus IS300 uses three primary tire sizes, and the right one depends on the exact sub-model and wheel setup. Both 18-inch and 19-inch rims are used, so the first step is confirming wheel diameter, then identifying whether the car is a standard AWD or RWD model, a Premium Package car, or an F Sport application with staggered front and rear sizing.
235/45R18 is a metric radial size with a 235-millimeter section width, a 45-series profile, and fitment for an 18-inch wheel. On the 2025 Lexus IS300, this size serves standard AWD and RWD configurations and delivers the taller sidewall of the primary fitment choices used on this model. Available options in this size come from BFGoodrich in blackwall form across g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A series. This is the size to focus on when the car retains its 18-inch setup and you want to compare tire series, load specifications, and rim-width compatibility within that fitment.
Fit(s): (AWD) w/Premium Pkg., (RWD) w/Premium Pkg., F Sport Design, and F Sport Front
Construction: Radial|Rim: 19 in
235/40R19 is a metric radial size that uses a 235-millimeter section width, a lower 40-series profile, and a 19-inch wheel diameter. On the 2025 Lexus IS300, it applies to several upgraded or sport-oriented configurations, including Premium Package and F Sport front fitments, so it should not be assumed across every version of the car. The available product choice here is a BFGoodrich g-Force Phenom T/A in blackwall styling. This size deserves close attention when the car has factory-style 19-inch front fitment and the goal is to preserve the intended wheel-and-tire proportion without crossing into the wider rear size.
265/35R19 is a metric radial with a 265-millimeter section width, a 35-series profile, and a 19-inch rim diameter. On the 2025 Lexus IS300, this is the wider rear fitment used on the F Sport Rear application, making it part of a staggered setup rather than a universal size for the model line. Product choices include blackwall options from BFGoodrich and Nitto across the g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2 series. This size matters when rear-wheel appearance, rear tire width, and correct staggered fitment are part of the car's present wheel configuration.
Fitment varies across the 2025 Lexus IS300 range, so checking the exact sub-model is essential before selecting a tire. The biggest distinctions are 18-inch versus 19-inch wheels and, on F Sport applications, the difference between front and rear tire sizing.
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2025 Lexus IS300 (AWD)
The 2025 Lexus IS300 (AWD) uses the 235/45R18 radial fitment on an 18-inch wheel. Tire selection here centers on choosing among the available blackwall performance-oriented options while keeping the car's standard wheel diameter and fitment profile in place.
The 2025 Lexus IS300 (AWD) w/Premium Pkg. moves to a 235/40R19 radial fitment. That makes wheel diameter confirmation especially important, since this version uses the lower-profile 19-inch setup rather than the 18-inch sizing found on the standard AWD car.
The 2025 Lexus IS300 (RWD) shares the 235/45R18 radial tire size with the standard AWD version. The key decision is comparing available tire series within that size while making sure the car still has its intended 18-inch wheel setup.
The 2025 Lexus IS300 (RWD) w/Premium Pkg. uses 235/40R19 radial tires. Selection starts with confirming the 19-inch wheel package, then choosing a tire that matches the car's lower-profile fitment rather than defaulting to the standard 18-inch size.
The 2025 Lexus IS300 F Sport Design uses the 235/40R19 radial size. That places it with the 19-inch front-style fitment group, so the main concern is maintaining the correct wheel diameter and profile when replacing tires.
The 2025 Lexus IS300 F Sport Front uses 235/40R19 radial tires at the front axle. Front tire replacement on this configuration should be approached with attention to position-specific sizing, especially on cars that may use a wider rear tire.
The 2025 Lexus IS300 F Sport Rear uses the wider 265/35R19 radial size. Rear tire choice here should account for the car's staggered arrangement, since this fitment is different from the narrower 235/40R19 size used at the front.
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 2025 Lexus IS300 Tires for Sale
Available 2025 Lexus IS300 tire choices center on radial blackwall performance tires from BFGoodrich and Nitto. Depending on size, buyers can compare series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2, along with rim-width and load-spec details where offered.
Owners of a 2025 Lexus IS300 usually need to sort out the exact tire size by sub-model, wheel diameter, and front or rear position first. These FAQs cover fitment, radial tire selection, product differences, and the checks that matter before regular road use.
Tire Size & Fitment
What tire size fits a 2025 Lexus IS300?
The 2025 Lexus IS300 uses three primary tire sizes: 235/45R18, 235/40R19, and 265/35R19. Standard AWD and RWD models use 235/45R18, while several Premium Package and F Sport front applications use 235/40R19. The F Sport rear fitment uses 265/35R19.
The correct choice depends on the exact sub-model and whether the tire is for the front or rear of the car. Start by confirming whether the Lexus has 18-inch or 19-inch wheels, then check whether it is a standard configuration or a staggered F Sport setup before selecting a replacement tire.
What size rim does a 2025 Lexus IS300 use?
The 2025 Lexus IS300 uses both 18-inch and 19-inch rim diameters, depending on configuration. The 235/45R18 fitment belongs on an 18-inch wheel, while both 235/40R19 and 265/35R19 use 19-inch wheels.
Wheel diameter is the first fitment check because the IS300 does not use one rim size across every version. A tire built for an 18-inch wheel cannot be mounted on a 19-inch wheel, so confirm the wheel currently on the car before comparing brands, series, or front-to-rear sizing.
Do all 2025 Lexus IS300 sub-models use the same tire size?
No. The 2025 Lexus IS300 uses different tire sizes across its covered sub-models. Standard AWD and RWD versions use 235/45R18, several Premium Package and F Sport front applications use 235/40R19, and the F Sport rear fitment uses 265/35R19.
That means the sub-model name alone may not be enough if the car uses a staggered setup, because front and rear sizes can differ. Checking the exact package, measuring the wheel diameter, and confirming whether the tire is being replaced at the front or rear will prevent an easy sizing mistake.
Choosing the Right Tire
What should I consider when choosing a tire for a 2025 Lexus IS300?
Start with the exact size that matches the car's configuration: 235/45R18, 235/40R19, or 265/35R19. From there, compare radial tire series, rim-width specifications where stated, load details where available, and whether the car uses a square setup or a staggered front-and-rear arrangement.
A standard AWD or RWD IS300 on 18-inch wheels presents a different decision than an F Sport car on 19s. It also helps to match the tire to how the car is driven, whether that means everyday street use, a more performance-focused feel, or maintaining the intended front-to-rear balance of the package already on the car.
What sidewall styles are available for 2025 Lexus IS300 tires?
The available 2025 Lexus IS300 tire options here use a blackwall sidewall style. That applies across the listed 18-inch and 19-inch fitments, including the 235/45R18, 235/40R19, and 265/35R19 sizes.
For this car, the decision is not about choosing between multiple sidewall looks such as whitewall or redline. The more useful comparison is among tire series, brand availability by size, and matching the sidewall profile to the correct wheel diameter and front or rear placement on the vehicle.
What brands offer tires for the 2025 Lexus IS300?
BFGoodrich appears across all three primary 2025 Lexus IS300 sizes, while Nitto is available in 265/35R19. Within BFGoodrich, the available series include g-Force Comp 2 AS, g-Force Sport Comp 2, and g-Force Phenom T/A, depending on the specific size.
Brand comparison should still begin with fitment rather than preference alone, because not every brand appears in every IS300 size. Once the correct size is confirmed, it becomes easier to compare the available series for the intended wheel setup, especially on cars using the wider 265/35R19 rear fitment.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2025 Lexus IS300?
Yes. Wheel changes, altered wheel width, suspension lowering, and other modifications can affect tire fitment on a 2025 Lexus IS300 even when the replacement tire is in one of the correct factory-style sizes. That matters most on 19-inch and staggered setups where front and rear fitment already differ.
A modified IS300 should be checked for wheel diameter, wheel width, and clearance at steering lock and suspension movement before a new tire is chosen. Even a correct-size tire needs to suit the actual wheel and body setup on the car, especially if it no longer matches its original package configuration.
What should I inspect before driving a 2025 Lexus IS300 on new tires?
Check that all four tires match the intended size and position for the car, with special attention to any F Sport staggered arrangement. Confirm proper inflation, inspect the wheels for damage, and make sure the tires seat correctly and clear the fenders, suspension components, and steering range.
A short test drive should include listening for rubbing and watching for vibration or pull. It is also smart to recheck air pressure after the initial drive and verify that front and rear tires were not accidentally swapped on a staggered setup, since the IS300 can use different sizes at each end.
How often should tires on a 2025 Lexus IS300 be inspected?
Tires on a 2025 Lexus IS300 should be inspected regularly for air loss, tread wear, cuts, punctures, bulges, and sidewall damage. A quick visual check before routine driving is a good habit, especially on lower-profile 19-inch fitments where impacts can affect both tire and wheel condition.
Inspection should also follow pothole strikes, curb contact, or any change in ride feel. On cars with staggered sizing, confirm that wear patterns remain appropriate at both ends and that replacement intervals are handled with the front and rear fitment differences in mind rather than treating the car like a one-size setup.
