The 2017 Lexus IS350 sits in the modern sport-sedan category with a chassis and powertrain character that reward precise steering response and balanced road manners. Buyers often encounter two fitment paths on this car: a square 225/45R17 setup or an 18-inch staggered arrangement using 225/40R18 in front and 255/35R18 in the rear. All primary fitments are radial, so the decision centers on confirming wheel diameter and whether the car uses matched or staggered sizing. From there, the real choice becomes tread and sidewall style, tire series, and whether the car is being kept close to stock or running a changed wheel setup.
Which Tire Size Is Right for The 2017 Lexus IS350
The 2017 Lexus IS350 uses three primary tire sizes, and the right one depends first on whether the car has 17-inch wheels or an 18-inch staggered front-and-rear setup. The 225/45R17 size serves square applications, while 225/40R18 and 255/35R18 work together on staggered cars, so confirming both sub-model and wheel diameter comes before comparing tire series or sidewall treatments.
225/45R17 is a metric radial size in which 225 identifies the nominal section width in millimeters, 45 is the aspect ratio, R confirms radial construction, and 17 is the wheel diameter in inches. On the 2017 Lexus IS350, this size supports the square 17-inch fitment used on certain AWD and RWD applications. Available choices include BFGoodrich, Nitto, and Pro-Trac, with blackwall, raised white letter, and redline sidewall treatments depending on the product line. It is the size to focus on when the car uses the same tire dimensions at all four corners and retains 17-inch wheels.
Fit(s): (AWD) Front, (RWD) Front, and F Sport Front
Construction: Radial|Rim: 18 in
225/40R18 is a metric radial size that uses a 225-millimeter nominal width, a 40-series profile, and an 18-inch rim diameter. On the 2017 Lexus IS350, this size serves as the front tire in the staggered 18-inch setup rather than a universal four-corner fitment. Product options in this size come from BFGoodrich and Nitto, primarily in blackwall performance-oriented series such as g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and NT555 G2. This is the front size to confirm when the car carries wider rear tires and the owner wants to preserve the intended staggered layout.
255/35R18 is a metric radial size with a wider 255-millimeter nominal section width, a 35-series profile, and an 18-inch rim diameter. On the 2017 Lexus IS350, it belongs at the rear of the staggered 18-inch arrangement and works in conjunction with 225/40R18 front tires. BFGoodrich and Nitto offer this size in blackwall form across several performance-focused series, giving buyers room to compare rim-width specifications, load figures where stated, and product character within the same fitment. It is the key rear size to verify on F Sport and other 18-inch staggered configurations.
Sub-model fitment on the 2017 Lexus IS350 matters because some versions use a single 17-inch tire size at all four corners while others use a staggered 18-inch front-and-rear arrangement. Confirming the exact sub-model and wheel setup prevents mixing square and staggered fitments when selecting tires.
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2017 Lexus IS350 (AWD)
The 2017 Lexus IS350 AWD uses a square 225/45R17 radial fitment when equipped in its 17-inch configuration. That keeps tire selection straightforward, with the main decisions centered on brand, tire series, and whether a blackwall, raised white letter, or redline presentation suits the car.
The 2017 Lexus IS350 AWD Front position uses 225/40R18 in the staggered 18-inch setup. Tire selection here should stay coordinated with the matching 255/35R18 rear size so the car retains the intended front-to-rear fitment relationship.
The 2017 Lexus IS350 AWD Rear position uses 255/35R18 on staggered 18-inch applications. That wider rear size should be matched with the proper 225/40R18 front tire, making wheel confirmation and front-to-rear pairing more important than choosing by diameter alone.
The 2017 Lexus IS350 RWD also appears with a square 225/45R17 radial fitment in its 17-inch arrangement. For this setup, the choice is less about front-versus-rear sizing and more about comparing available tire series, sidewall style, and wheel-width compatibility.
The 2017 Lexus IS350 RWD Front position uses 225/40R18 when the car is equipped with the staggered 18-inch setup. Selecting this size means preserving the front half of the staggered pairing rather than treating it as an all-around replacement size.
The 2017 Lexus IS350 RWD Rear position uses 255/35R18 in the staggered 18-inch arrangement. Buyers should choose this size with the matching front fitment in mind and confirm that the rear wheels still match the intended 18-inch setup.
The 2017 Lexus IS350 F Sport Front uses 225/40R18 as the front tire size. That makes the front tire choice part of a staggered package, so the priority is selecting a compatible front tire to pair correctly with the 255/35R18 rear.
The 2017 Lexus IS350 F Sport Rear uses 255/35R18 at the rear axle. Tire selection should maintain the staggered front-and-rear sizing approach, with attention given to matching series and overall setup rather than choosing a rear tire in isolation.
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 2017 Lexus IS350 Tires for Sale
Available 2017 Lexus IS350 tires span 225/45R17, 225/40R18, and 255/35R18 sizes from BFGoodrich, Nitto, and Pro-Trac. Buyers can compare blackwall performance-oriented series across all three sizes, with raised white letter and redline styling also available in 225/45R17.
Tire questions for the 2017 Lexus IS350 usually come down to square versus staggered fitment, 17-inch versus 18-inch wheels, and how to compare available radial tire series and sidewall styles. The answers below focus on exact size selection, wheel confirmation, product choice, and practical road-use checks.
Tire Size & Fitment
What tire size fits a 2017 Lexus IS350?
The 2017 Lexus IS350 uses 225/45R17 in square 17-inch applications, while 18-inch staggered setups use 225/40R18 in front and 255/35R18 in the rear. All of these are radial tire sizes, and the correct choice depends on the car's exact wheel and sub-model configuration.
The key is to verify whether the car has the same size on all four corners or a staggered arrangement with different front and rear tires. Checking the wheel diameter and the existing front and rear size markings helps prevent choosing a 17-inch square tire for a car that actually uses the 18-inch staggered setup.
What size rim does a 2017 Lexus IS350 use?
A 2017 Lexus IS350 uses either a 17-inch or 18-inch rim, depending on the tire size and configuration. The 225/45R17 tire fits a 17-inch wheel, while both 225/40R18 and 255/35R18 fit 18-inch wheels in the staggered setup.
Rim diameter is the first thing to confirm before shopping for tires, because a 17-inch tire cannot be mounted on an 18-inch wheel and vice versa. It also helps to check wheel width, especially on staggered cars, since front and rear wheels may differ even though both use the same 18-inch rim diameter.
Why does the 2017 Lexus IS350 have more than one tire size?
The 2017 Lexus IS350 has more than one tire size because some versions use a square 17-inch fitment, while others use a staggered 18-inch arrangement with different sizes at the front and rear. That is why 225/45R17, 225/40R18, and 255/35R18 all appear within the same model year.
This means tire selection starts with identifying the actual wheel setup on the car rather than assuming every IS350 uses the same dimensions. Looking at the current tires and confirming whether the front and rear sizes match will point you toward the correct replacement path before brand or series comparisons begin.
Choosing the Right Tire
What should I consider when choosing a tire for a 2017 Lexus IS350?
Start with the exact size and layout the car uses: 225/45R17 in a square setup, or 225/40R18 front with 255/35R18 rear in a staggered setup. From there, compare radial tire series, wheel-width compatibility, load figures where stated, and whether the car is being kept close to stock or running altered wheels.
A square 17-inch car gives more freedom to focus on sidewall style and series choice, while a staggered 18-inch car needs coordinated front and rear selection. It also helps to think about intended use, since a daily-driven sedan, a weekend car, and a visually customized IS350 may point toward different priorities within the same correct size.
What sidewall styles are available for 2017 Lexus IS350 tires?
Sidewall style depends on the size. Blackwall options are available across 225/45R17, 225/40R18, and 255/35R18, while 225/45R17 also includes raised white letter and redline choices through the Street Pro III line.
That means sidewall appearance can become part of the decision if the car uses the 17-inch square fitment, especially for an owner who wants a more distinctive look. On 18-inch staggered setups, the available products stay focused on blackwall presentation, so the comparison leans more toward tire series and wheel-width suitability than visual sidewall treatment.
What brands offer tires for the 2017 Lexus IS350?
Tires for the 2017 Lexus IS350 are available from BFGoodrich, Nitto, and Pro-Trac, depending on the size. BFGoodrich and Nitto cover the 17-inch and 18-inch fitments, while Pro-Trac appears in 225/45R17 with alternate sidewall styling choices.
Brand choice should still come after confirming the correct size and wheel setup. Once that is settled, it becomes easier to 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 based on appearance, stated specifications, and how the car is actually used.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 Lexus IS350?
Yes. Wheel changes, suspension lowering, altered offsets, and non-stock front-to-rear wheel widths can all affect tire fitment on a 2017 Lexus IS350. That matters even when the tire size itself is correct, especially on 18-inch staggered cars where the front and rear setup already differs by design.
A modified car should be checked for wheel diameter, wheel width, inner clearance, outer fender clearance, and steering travel before replacement tires are chosen. Even a stock-size tire can create issues if the wheels or ride height have changed, so measuring the actual setup on the car is more useful than relying on model-year fitment alone.
What should I inspect before driving a 2017 Lexus IS350 on new tires?
Before road use, inspect tire pressure, wheel condition, valve stems, lug torque, and the basic condition of the suspension and alignment-related wear points. It is also smart to confirm that the front and rear tires are mounted in the proper positions if the car uses the 225/40R18 and 255/35R18 staggered arrangement.
A quick visual check for rubbing marks, uneven gaps, and any contact at full steering lock can catch setup problems early. After the first drive, rechecking pressure and looking for any unusual wear or scuffing helps confirm that the tires, wheels, and chassis are working together as they should.
How often should tires on a 2017 Lexus IS350 be inspected?
Tires on a 2017 Lexus IS350 should be inspected regularly, not just when tread looks low. Pressure loss, uneven wear, sidewall damage, and age-related deterioration can develop gradually, and a staggered setup makes it especially important to keep an eye on each position rather than assuming all four tires are wearing the same way.
A routine inspection should include tread condition, cuts, bulges, punctures, and any signs of rubbing or alignment-related wear. Cars that sit for long periods deserve the same attention, since low-use vehicles can still develop flat spotting, air loss, and age issues even when the tire has covered relatively few miles.
