The 2017 Lexus Trucks RX350 blends Lexus comfort and refinement with the everyday versatility that made the RX one of the most recognizable luxury crossovers of its era. Buyers shopping this exact model usually are not sorting through vintage sizing systems or bias-ply choices, but they do need to confirm the correct wheel and trim setup before replacing tires. The 2017 Lexus Trucks RX350 uses modern radial sizes, with 235/65R18 and 235/55R20 both appearing on this model line. That makes wheel diameter and sub-model identification the real starting point. Once that is settled, the decision turns to choosing the right radial tire for the vehicle's current wheels, road use, and overall stance.
Which Tire Size Is Right for The 2017 Lexus Trucks RX350
Two tire sizes apply to the 2017 Lexus Trucks RX350, and the right one depends first on the exact sub-model and wheel diameter. Both are radial fitments, but one uses an 18-inch rim and the other a 20-inch rim, so confirming the vehicle's current wheel setup is the most important first step before comparing tire choices.
In 235/55R20, the 235 identifies the nominal section width in millimeters, 55 is the aspect ratio, R indicates radial construction, and 20 is the wheel diameter in inches. This is a modern radial size used on the 2017 Lexus Trucks RX350, including the F Sport configuration, and it belongs on a 20-inch wheel. Its dimensions make it part of the vehicle's exact fitment picture rather than a universal substitute for the other RX350 size. Buyers considering this size should verify that the vehicle is actually on 20-inch wheels before moving forward.
In 235/65R18, the 235 is the nominal section width in millimeters, 65 is the aspect ratio, R marks radial construction, and 18 is the wheel diameter in inches. This is also a modern radial fitment for the 2017 Lexus Trucks RX350 and it is used with an 18-inch wheel. Even though it shares the same section width as the 20-inch fitment, it is tied to a different wheel diameter and should be treated as its own exact size choice. Tire selection starts with confirming that the RX350 is equipped with 18-inch wheels.
Sub-model fitment matters on the 2017 Lexus Trucks RX350 because not every version uses the same tire size. The Base model can appear with either 18-inch or 20-inch fitment, while the F Sport uses the 20-inch size, so identifying the exact sub-model and wheel package comes first.
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2017 Lexus Trucks RX350 Base
The 2017 Lexus Trucks RX350 Base can use either of the model's two radial tire sizes, which makes wheel confirmation especially important before replacement. Tire selection for this sub-model starts with checking whether the vehicle is currently fitted with 18-inch or 20-inch wheels rather than assuming one size applies to every Base example.
The 2017 Lexus Trucks RX350 F Sport uses the 235/55R20 radial size, tying it to a 20-inch wheel setup. That makes the choice more straightforward than the Base model, but buyers should still confirm the wheels on the vehicle, especially if it has been changed from its original configuration.
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.
Frequently Asked Questions
The most useful tire questions for the 2017 Lexus Trucks RX350 center on choosing between 235/65R18 and 235/55R20, confirming the correct sub-model and wheel diameter, and checking fitment details before road use or after any wheel or suspension changes.
Tire Size & Fitment
What tire size fits a 2017 Lexus Trucks RX350?
The 2017 Lexus Trucks RX350 uses two radial tire sizes: 235/65R18 and 235/55R20. The Base model can be found with either size, while the F Sport uses 235/55R20. Both are modern metric radial sizes, but they are tied to different wheel diameters.
Choosing the right one starts with the actual wheels on the vehicle, not just the model name on the tailgate. An 18-inch wheel requires the 235/65R18 size, and a 20-inch wheel requires the 235/55R20 size. If the RX350 has had wheels changed at any point, check the sidewall of the current tire and confirm the wheel diameter before replacing anything.
What size rim does a 2017 Lexus Trucks RX350 use?
The 2017 Lexus Trucks RX350 uses either an 18-inch rim or a 20-inch rim, depending on the tire size and configuration. The 235/65R18 tire fits an 18-inch wheel, and the 235/55R20 tire fits a 20-inch wheel. Those two sizes are not interchangeable across the same wheel.
Rim diameter is the first measurement to confirm because it determines which tire size belongs on the vehicle. The Base model may have either setup, so visual assumptions can lead to the wrong choice. Checking the current tire sidewall or measuring the wheel directly is the cleanest way to avoid ordering an 18-inch tire for a 20-inch wheel, or the reverse.
Do all 2017 Lexus Trucks RX350 sub-models use the same tire size?
No, all 2017 Lexus Trucks RX350 sub-models do not use the same tire size. The F Sport uses 235/55R20, while the Base model can use either 235/55R20 or 235/65R18. That means the exact trim and wheel setup both matter when identifying the correct replacement tire.
This is one of those fitment situations where the model name alone is not enough. A Base RX350 on 18-inch wheels needs a different tire than a Base or F Sport on 20-inch wheels, even though the vehicles are closely related. Before choosing a tire, confirm the sub-model and then verify the current wheel diameter on the vehicle itself.
Choosing the Right Tire
What should I consider when choosing a tire for a 2017 Lexus Trucks RX350?
Start with the exact size the vehicle uses: 235/65R18 or 235/55R20. On the 2017 Lexus Trucks RX350, that depends on the sub-model and wheel diameter, with the Base model appearing in either fitment and the F Sport using the 20-inch size. Correct size always comes before any other tire preference.
Once the size is confirmed, look at how the RX350 is actually used. Daily commuting, highway travel, seasonal conditions, and ride preference all influence which radial tire makes the most sense. It is also smart to confirm that all four wheels match, especially on a used vehicle, so the replacement tire is chosen around the actual setup rather than assumption.
How do I choose between the available 2017 Lexus Trucks RX350 tire sizes?
There is no pick-and-choose decision between 235/65R18 and 235/55R20 unless the wheels themselves are being changed. Each size belongs to a different rim diameter, so the correct tire is determined by whether the RX350 has 18-inch or 20-inch wheels. The F Sport points to the 20-inch fitment, while the Base can go either way.
That means the practical job is confirming what is already on the vehicle. Look at the size molded into the sidewall and compare it to the wheel diameter before replacing a tire. Even though the two sizes have very similar overall diameters, they are not the same fitment because the wheel requirement is different.
Why does the 2017 Lexus Trucks RX350 have more than one tire size?
The 2017 Lexus Trucks RX350 has more than one tire size because different configurations use different wheel diameters. The model appears with both 18-inch and 20-inch fitments, which creates two valid radial tire sizes within the same year and model family. The F Sport is tied to the 20-inch size, while the Base is less uniform.
This kind of variation is common when one model is offered with more than one wheel package. It does not mean both sizes should be treated as interchangeable on the same set of wheels. The right approach is to verify the exact trim and inspect the actual wheels on the vehicle, especially if it has been owned previously or modified.
Restoration & Appearance
Does correct tire fitment matter for a 2017 Lexus Trucks RX350 restoration or refurbishment?
Yes, correct tire fitment still matters on a 2017 Lexus Trucks RX350, even though this is a newer vehicle than a traditional collector car. Using the proper 235/65R18 or 235/55R20 size helps preserve the intended wheel-to-tire relationship and keeps the vehicle visually consistent with its correct configuration.
A refurbishment-minded owner should first decide whether the goal is to return the RX350 to its proper wheel setup or simply maintain what is currently on the vehicle. That is especially important on the Base model, since it can appear with either size. Checking trim details, wheel diameter, and existing equipment keeps appearance decisions grounded in the vehicle's actual setup.
How does tire size affect the appearance of a 2017 Lexus Trucks RX350?
Tire size affects the appearance of a 2017 Lexus Trucks RX350 because the model uses two different wheel diameters with closely related overall tire dimensions. A 235/65R18 presents the vehicle around an 18-inch wheel, while a 235/55R20 presents it around a 20-inch wheel. That changes the visual balance between wheel and sidewall.
For owners who care about keeping the RX350's intended look, the goal is not to choose whichever size seems more attractive in isolation. The goal is to match the tire to the wheel setup that belongs on the specific vehicle. Confirming the trim and actual wheels helps maintain a coherent appearance rather than creating a mismatched tire-and-wheel combination.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2017 Lexus Trucks RX350?
Yes, modifications can affect tire fitment on a 2017 Lexus Trucks RX350. Wheel changes, suspension lowering, offset changes, and non-original tire sizes can all alter the clearance relationship around the fenders, steering components, and suspension. That matters even when the vehicle started with a correct 235/65R18 or 235/55R20 fitment.
A modified RX350 should be inspected as it sits today rather than treated as a stock-fitment vehicle. Check the actual wheel diameter, confirm the mounted tire size, and look for rubbing marks at full steering lock or under compression. Any change in wheel design or ride height can shift the fitment equation enough to make careful verification worthwhile.
What should I inspect before driving a 2017 Lexus Trucks RX350 on new tires?
Before driving a 2017 Lexus Trucks RX350 on new tires, confirm that all four tires are the correct size for the wheels, that inflation pressure is set properly, and that the beads are fully seated. A quick visual inspection should also include sidewall condition, valve stems, and any obvious clearance issue around the wheel wells.
A short local drive is a good way to catch vibration, pulling, or contact that was not obvious while the vehicle was stationary. Recheck pressure after installation and make sure the steering moves cleanly from lock to lock without interference. On a used RX350, this step matters even more because wheel or suspension changes may not be obvious at first glance.
What should I check before a longer drive in a 2017 Lexus Trucks RX350?
Before a longer drive in a 2017 Lexus Trucks RX350, inspect tread condition, sidewalls, and inflation pressure, and make sure the tire size matches the vehicle's current wheel setup. The correct fitment will be either 235/65R18 or 235/55R20 depending on the wheels and sub-model, so size confirmation is part of basic trip preparation.
It also helps to look for uneven wear, slow air loss, or any sign that the vehicle may need alignment or suspension attention. Longer highway use tends to expose problems that short around-town driving can hide. A careful pre-drive check is especially worthwhile if the RX350 has been sitting for a while or recently received replacement tires.
