The 2015 Lexus Trucks RX350 sits in the modern luxury crossover space where quiet highway manners, year-round drivability, and refined road feel matter just as much as appearance. Buyers looking at this exact RX350 usually are not sorting through old sizing systems or restoration-era construction choices, but they still need to match the vehicle’s wheel setup correctly. This model uses radial tires in either 235/60R18 or 235/55R19, depending on configuration. That makes the key decision less about bias-ply versus radial and more about confirming rim diameter, especially between Base and F Sport applications. Once the correct size is verified, attention can shift to ride quality, tread style, and overall fitment confidence.
Which Tire Size Is Right for The 2015 Lexus Trucks RX350
The 2015 Lexus Trucks RX350 uses two primary tire sizes, and the first step is confirming whether the vehicle is on 18-inch or 19-inch wheels. Size selection also overlaps with sub-model fitment, since the Base can use either size while the F Sport uses 235/55R19. Once wheel diameter and sub-model are confirmed, the decision becomes choosing the right radial tire within that correct fitment.
235/55R19 is a metric radial size where 235 identifies the nominal section width in millimeters, 55 is the aspect ratio, R denotes radial construction, and 19 is the wheel diameter in inches. On the 2015 Lexus Trucks RX350, this size suits a 19-inch wheel setup and is used on the F Sport as well as certain Base configurations. Its overall diameter stays very close to the 18-inch alternative, but the correct wheel is essential. This is the size to focus on when the RX350 already carries 19-inch rims and the goal is to keep the intended fitment relationship intact.
235/60R18 is a metric radial size with a 235-millimeter nominal section width, a 60-series profile, radial construction, and an 18-inch rim diameter. On the 2015 Lexus Trucks RX350, this size applies to Base models equipped with 18-inch wheels. Its section width closely matches the 19-inch fitment, but the rim diameter is different, so the two sizes are not chosen interchangeably without confirming the wheel itself. This fitment is the right place to start when the vehicle has 18-inch wheels and the goal is to stay with the proper factory-type size range.
Sub-model fitment matters on the 2015 Lexus Trucks RX350 because tire size changes with wheel and trim configuration. The Base can use either of the two primary radial sizes, while the F Sport is tied to the 19-inch setup.
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2015 Lexus Trucks RX350 Base
The 2015 Lexus Trucks RX350 Base can use either 235/60R18 or 235/55R19, so the actual wheel diameter on the vehicle needs to be confirmed before selecting tires. That makes this sub-model less about choosing between constructions and more about matching the tire to the wheel already in place.
The 2015 Lexus Trucks RX350 F Sport uses the 235/55R19 radial tire size. Tire selection for this sub-model centers on staying with the correct 19-inch fitment and verifying that the vehicle still has its intended wheel setup if any aftermarket changes have been made.
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
Tire questions for the 2015 Lexus Trucks RX350 usually come down to identifying the correct size by wheel diameter and sub-model. The answers below focus on fitment, rim selection, radial sizing, practical tire choice, and road-use checks.
Tire Size & Fitment
What tire size fits a 2015 Lexus Trucks RX350?
The 2015 Lexus Trucks RX350 uses two radial tire sizes: 235/60R18 and 235/55R19. The Base model can use either size, while the F Sport uses 235/55R19. Both are modern metric radial sizes, but they fit different wheel diameters, so the correct size depends on the wheel and sub-model combination on the vehicle.
The most useful first check is the wheel diameter currently on the RX350. An 18-inch wheel calls for 235/60R18, while a 19-inch wheel calls for 235/55R19. If the vehicle has changed hands or has aftermarket wheels, verify the actual setup before buying tires so the new set matches the rim properly and maintains proper clearance.
What size rim does a 2015 Lexus Trucks RX350 use?
A 2015 Lexus Trucks RX350 uses either an 18-inch or 19-inch rim, depending on configuration. The 235/60R18 tire fits an 18-inch wheel, and the 235/55R19 tire fits a 19-inch wheel. The F Sport is associated with the 19-inch fitment, while the Base may be found with either wheel diameter.
Rim diameter is the key detail to confirm because tire size is built around it. Even though the two RX350 sizes have very similar overall diameters, they are not selected the same way at the wheel. Checking the tire sidewall and measuring the wheel setup already on the vehicle helps prevent choosing a tire that does not match the rim.
Do all 2015 Lexus Trucks RX350 sub-models use the same tire size?
No, not all 2015 Lexus Trucks RX350 sub-models use the same tire size. The F Sport uses 235/55R19, while the Base can use either 235/55R19 or 235/60R18. That means trim level alone is helpful, but the actual wheel diameter still needs to be confirmed before selecting a replacement tire.
This matters most when shopping for a Base model, since it spans both fitments. A quick visual check of the wheel can point you in the right direction, but the sidewall size marking is the best confirmation. Matching the tire to the wheel already on the vehicle is more important than assuming every RX350 in this model year was equipped the same way.
Choosing the Right Tire
What should I consider when choosing a 235/55R19 tire for a 2015 Lexus Trucks RX350?
Start with fitment accuracy. A 235/55R19 tire is appropriate for a 2015 Lexus Trucks RX350 equipped with 19-inch wheels, including the F Sport and certain Base configurations. Since this is already a modern radial fitment, the main concerns are staying with the correct size, matching the wheel diameter, and choosing a tire suited to how the vehicle is driven.
Beyond size, compare the tire’s intended use, tread design, and overall road character. A daily-driven RX350 may call for a different balance than one used mainly for occasional travel. It also helps to inspect the existing wheels for any non-original sizing changes, since that can affect which 235/55R19 tire is the most sensible match for the vehicle.
What should I consider when choosing a 235/60R18 tire for a 2015 Lexus Trucks RX350?
A 235/60R18 tire belongs on a 2015 Lexus Trucks RX350 Base with 18-inch wheels. The first concern is confirming that the vehicle is actually on the 18-inch setup, since the same model year also uses a 19-inch fitment. Once that is settled, the tire choice becomes a matter of selecting the right radial tire within the proper size.
Look at how the RX350 is used and how closely the new tire should match the vehicle’s current road manners. A vehicle driven regularly on highways may call for different priorities than one used mostly around town. Checking the age and condition of the existing tires can also reveal whether the full set should be replaced together for more consistent performance.
How do I choose between the available tire sizes for a 2015 Lexus Trucks RX350?
Choosing between 235/60R18 and 235/55R19 is not a styling preference on its own; it depends on the wheel diameter and sub-model setup already on the 2015 Lexus Trucks RX350. The Base may use either size, but the F Sport uses 235/55R19. The correct tire is the one that matches the wheel actually installed on the vehicle.
That means the decision should begin at the wheel, not with a general size comparison. Read the current sidewall, confirm whether the RX350 has 18-inch or 19-inch rims, and account for any wheel changes made by a prior owner. Once the proper fitment is identified, the rest of the selection process becomes much more straightforward.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 Lexus Trucks RX350?
Yes, modifications can affect tire fitment on a 2015 Lexus Trucks RX350. Wheel changes, suspension alterations, ride-height adjustments, and body modifications can all change the clearance relationship around a 235/55R19 or 235/60R18 tire. Even when the tire size appears close to the original fitment, the wheel and surrounding space still need to be checked carefully.
A modified RX350 should be evaluated for steering clearance, fender clearance, and correct wheel diameter before new tires are chosen. It is also wise to confirm the current wheel width and look for signs of rubbing on the old tires. Small setup changes can have a real effect on tire behavior, especially at full lock or over suspension movement.
What should I inspect before driving a 2015 Lexus Trucks RX350 on new tires?
Before driving a 2015 Lexus Trucks RX350 on new tires, inspect the wheels for damage, confirm the new tires match the vehicle’s actual wheel diameter, and make sure the set is installed in the proper size. It is also smart to check valve stems, tire pressure, and general wheel condition so the new tires are not being mounted onto a compromised foundation.
A short follow-up inspection after the first miles is also worthwhile. Look for any signs of rubbing, uneven seating, vibration, or air loss, and pay attention to how the RX350 tracks and steers. On a vehicle with prior wheel or suspension changes, that first check helps confirm the new tires are working with the setup rather than against it.
How often should tires on a 2015 Lexus Trucks RX350 be inspected?
Tires on a 2015 Lexus Trucks RX350 should be inspected regularly, not just when tread looks low. Routine checks for pressure loss, uneven wear, cuts, bulges, and sidewall damage are important whether the vehicle is used daily or only occasionally. A modern radial tire can still age or develop issues long before a problem becomes obvious from a casual glance.
Monthly visual checks are a sensible habit, with a closer inspection before longer trips. It also helps to examine the tires after any hard impact with a pothole or curb, especially on 18-inch and 19-inch wheel setups where wheel damage can accompany tire damage. Consistent inspection supports safer road use and helps catch fitment or alignment problems early.
