The 2019 Lexus IS350 sits in the modern sport-sedan space where sharp steering response, balanced proportions, and daily drivability all matter. Buyers looking at this exact model are usually deciding between a square 17-inch setup and the staggered 18-inch arrangement used on front and rear positions. Tire fitment here is fully radial, with 225/45R17 used on standard AWD and RWD applications, while 18-inch front and rear fitments step to 225/40R18 and 255/35R18. Available choices include Blackwall performance radials, plus RWL and Redline options in 225/45R17. The key is matching the tire to the actual wheel package and intended look before replacing anything.
Which Tire Size Is Right for The 2019 Lexus IS350
Three primary tire sizes apply to the 2019 Lexus IS350, and the right one depends on whether the car has the standard 17-inch setup or the staggered 18-inch front and rear arrangement. Confirming the wheel diameter comes first, and on 18-inch cars the front and rear positions must also be matched correctly. Once that is settled, the real choice is between available radial tire series, sidewall treatments, and product specifications within the proper size.
225/45R17 is a metric radial size in which 225 identifies the section width in millimeters, 45 is the aspect ratio, R denotes radial construction, and 17 is the wheel diameter in inches. On the 2019 Lexus IS350, this size suits the 17-inch square setup used on AWD and RWD applications rather than the staggered 18-inch package. Product choices in this size include BFGoodrich, Nitto, and Pro-Trac, with Blackwall, RWL, and Redline sidewall treatments available across several tire series. It is the right place to start when the car wears 17-inch wheels and appearance matters alongside everyday road use.
Fit(s): (AWD) Front, (RWD) Front, and F Sport Front
Construction: Radial|Rim: 18 in
225/40R18 is a metric radial size with a 225-millimeter section width, a 40-series profile, radial construction, and an 18-inch rim diameter. On the 2019 Lexus IS350, this size is used at the front of staggered 18-inch AWD, RWD, and F Sport setups, so it should not be treated as a universal four-corner fitment. Available options come from BFGoodrich and Nitto in performance-oriented radial series, all with a Blackwall presentation. This is the correct front-position size to evaluate when the car has the 18-inch package and a narrower front tire than rear.
255/35R18 is a metric radial size where 255 gives the section width in millimeters, 35 identifies the lower-profile sidewall, R marks radial construction, and 18 is the rim diameter. On the 2019 Lexus IS350, it serves as the rear tire in staggered 18-inch AWD, RWD, and F Sport applications, pairing with a narrower 225/40R18 front. Product selection includes BFGoodrich and Nitto Blackwall radials across several series with differing rim-width specifications and load figures. It is the rear size to confirm when replacing tires on an 18-inch IS350 that does not use the 17-inch square setup.
Sub-model fitment on the 2019 Lexus IS350 is straightforward once the wheel package is identified, but the covered configurations do not all use the same size. Some versions use a square 17-inch setup, while others use staggered 18-inch front and rear tires, so checking the exact sub-model and axle position matters before selecting replacements.
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2019 Lexus IS350 (AWD)
The 2019 Lexus IS350 (AWD) uses the 225/45R17 radial size when equipped with the 17-inch setup. Tire selection here centers on choosing among available radial series and sidewall treatments rather than sorting front-to-rear staggered fitment.
The 2019 Lexus IS350 (AWD) Front uses 225/40R18 as part of the staggered 18-inch arrangement. That means the front tire should be matched to the correct front position and paired with the proper rear size rather than replaced as a square 18-inch set.
The 2019 Lexus IS350 (AWD) Rear uses 255/35R18 on the staggered 18-inch package. Tire choice should focus on the correct rear-position size, with wheel width and compatibility checked before mixing series or replacing only one axle.
The 2019 Lexus IS350 (RWD) uses 225/45R17 when the car has the 17-inch square setup. That keeps replacement straightforward, with the main decision shifting to brand, tire series, and whether a Blackwall, RWL, or Redline presentation is preferred.
The 2019 Lexus IS350 (RWD) Front uses 225/40R18 on staggered 18-inch applications. Choosing a tire for this position means confirming the front wheel setup and keeping the front and rear sizes in their proper locations.
The 2019 Lexus IS350 (RWD) Rear uses 255/35R18 on staggered 18-inch applications. Replacement should be approached as a rear-specific fitment, especially when comparing tire series with different rim-width ranges or load specifications.
The 2019 Lexus IS350 F Sport Front uses 225/40R18. Tire selection should stay focused on front-position fitment for the staggered 18-inch arrangement, with attention paid to matching the intended driving use and keeping the front and rear setup balanced.
The 2019 Lexus IS350 F Sport Rear uses 255/35R18. This rear fitment should be checked against the actual wheel width and paired correctly with the front size, rather than assuming the same tire belongs at all four corners.
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 2019 Lexus IS350 Tires for Sale
Available 2019 Lexus IS350 tire options span 225/45R17, 225/40R18, and 255/35R18 radials from BFGoodrich, Nitto, and Pro-Trac. Buyers can compare series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, NT555 G2, and Street Pro III, with Blackwall options throughout and RWL or Redline available in 225/45R17.
Common questions for the 2019 Lexus IS350 usually come down to wheel package, staggered versus square fitment, available radial tire choices, and what to inspect before putting the car back on the road.
Tire Size & Fitment
What tire size fits a 2019 Lexus IS350?
The 2019 Lexus IS350 uses three primary tire sizes depending on configuration: 225/45R17, 225/40R18, and 255/35R18. The 17-inch setup uses 225/45R17, while the staggered 18-inch arrangement uses 225/40R18 in front and 255/35R18 in the rear.
That makes wheel package verification the first step before ordering tires. A square 17-inch car should not be treated like an 18-inch staggered car, and an 18-inch IS350 needs the correct size on each axle. Checking the actual wheel diameter and whether the car has matching or staggered wheels prevents a very common replacement mistake.
What size rim does a 2019 Lexus IS350 use?
The 2019 Lexus IS350 uses either a 17-inch or 18-inch rim, depending on the tire size and configuration. The 225/45R17 size fits a 17-inch rim, while both 225/40R18 and 255/35R18 fit 18-inch rims.
Rim diameter needs to match the tire size exactly, so the tire code should agree with the wheel on the car. On 18-inch setups, front and rear tires share the same rim diameter but not the same width. It is also worth checking the wheel width against the tire being considered, especially if the car has aftermarket wheels.
Why does the 2019 Lexus IS350 have more than one tire size?
More than one tire size appears on the 2019 Lexus IS350 because the car can be equipped with either a square 17-inch setup or a staggered 18-inch setup. In the staggered arrangement, the front uses 225/40R18 and the rear uses 255/35R18, while the 17-inch arrangement uses 225/45R17.
That difference affects tire ordering, rotation planning, and replacement strategy. A square setup can use the same size at all four corners, but a staggered setup requires the correct front and rear sizes to stay in their proper positions. Looking at the actual wheels and current tire markings is the safest way to confirm what belongs on the car.
Choosing the Right Tire
What should I consider when choosing a 2019 Lexus IS350 tire?
Start with the correct size for the actual setup on the car, since the 2019 Lexus IS350 may use 225/45R17 or a staggered 18-inch combination of 225/40R18 front and 255/35R18 rear. From there, compare radial tire series, rim-width compatibility, load figures where shown, and the intended use of the car.
A daily-driven IS350 may point you toward one type of tread and construction emphasis, while an appearance-focused build may place more value on sidewall presentation. The 225/45R17 size also brings more visible style variety than the 18-inch sizes. Matching the tire to the correct wheel package is more important than choosing by brand name alone.
What sidewall styles are available for 2019 Lexus IS350 tires?
Sidewall choices depend on size. In 225/45R17, the 2019 Lexus IS350 has Blackwall options along with RWL and Redline alternatives. The available 225/40R18 and 255/35R18 products are Blackwall radials.
That means the visual decision is most relevant on 17-inch cars or on anyone trying to create a more custom look with the square setup. An owner focused on a cleaner modern appearance may stay with Blackwall, while RWL or Redline can change the presentation noticeably. Style should still come after confirming the correct size and wheel diameter.
What brands offer tires for the 2019 Lexus IS350?
Tires for the 2019 Lexus IS350 are available from BFGoodrich, Nitto, and Pro-Trac, depending on size. BFGoodrich appears across all three primary sizes, Nitto also covers all three, and Pro-Trac options are available in 225/45R17.
Brand is only one part of the decision, since the available series differ by sidewall treatment, rim-width range, and other product details. It makes sense to narrow the search by exact size and wheel setup first, then compare brands within that fitment. That approach keeps the choice grounded in compatibility rather than name recognition.
Restoration & Appearance
Which tire should I choose for a period-style 2019 Lexus IS350?
A period-style choice for a 2019 Lexus IS350 starts with keeping the tire size matched to the car's actual wheel package. The model uses modern radial sizes, so the most authentic-looking approach usually comes from selecting the correct 17-inch or staggered 18-inch fitment first, then choosing a sidewall style that suits the desired presentation.
Among the available options, 225/45R17 offers the most visible style flexibility because it can be found in Blackwall, RWL, and Redline form. That can matter on a custom or appearance-driven build. If exact originality is the goal, compare the car's current wheel and trim setup against marque-specific references before deciding on a decorative sidewall treatment.
How does tire construction affect the appearance of a restored 2019 Lexus IS350?
Construction is simple on the 2019 Lexus IS350 because the fitments here are radial tires throughout. The visible appearance difference comes less from bias-ply versus radial and more from sidewall style, tread presentation, and whether the car is using the 17-inch square setup or the staggered 18-inch arrangement.
That makes wheel choice and sidewall treatment the main visual tools for an owner refining the car's look. A Blackwall tire keeps the presentation understated and contemporary, while RWL or Redline in 225/45R17 creates a more customized appearance. The right visual result still depends on staying with the correct tire size for the actual wheel package.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2019 Lexus IS350?
Yes, modifications can change tire fitment on a 2019 Lexus IS350 even when the tire size looks close to stock. Aftermarket wheels, wheel-width changes, altered offset, lowering springs, and suspension changes can all affect how a 225/45R17, 225/40R18, or 255/35R18 tire sits in the wheelwell.
Clearance should be checked at full steering lock and through suspension travel, especially on staggered 18-inch cars. A modified IS350 may also need closer attention to front-to-rear fitment and wheel width than a stock car. Before replacing tires, compare the actual wheel dimensions and inspect for any rubbing marks near fenders, liners, and suspension components.
What should I inspect before driving a 2019 Lexus IS350 on new tires?
Before driving a 2019 Lexus IS350 on new tires, inspect wheel condition, confirm the installed size at each position, and make sure the tires are mounted on the correct rim diameter. It is also smart to check inflation pressure, lug torque, and visible clearance around the fenders, struts, and inner liners.
A short road test can reveal vibration, pull, or rubbing that may not be obvious while the car is stationary. On staggered 18-inch setups, verify that the 225/40R18 tires are in front and the 255/35R18 tires are in the rear. Catching a mismatch early helps avoid uneven wear and unnecessary handling issues.
How often should tires on a 2019 Lexus IS350 be inspected?
Tires on a 2019 Lexus IS350 should be inspected regularly, especially if the car is driven hard, parked for long periods, or used with low-profile 18-inch tires. Routine checks should include tread wear, uneven shoulder wear, cuts, bulges, embedded debris, and any sign of gradual air loss.
Monthly pressure checks are a sensible habit, and a visual inspection before longer trips can catch problems early. Cars with staggered sizing need extra attention because front and rear tires do different jobs and cannot simply be treated as identical. If the IS350 has been stored, inspect the sidewalls carefully before returning it to regular road use.
