The 2016 Lexus Trucks RX350 sits in the modern luxury crossover segment, blending everyday comfort with the refined road manners that helped make the RX a familiar choice for drivers who wanted utility without giving up a premium feel. For this model year, tire selection centers on two primary radial sizes: 235/65R18 and 235/55R20. That makes the key decision less about vintage construction and more about confirming the exact wheel setup, especially between the Base and F Sport configurations. Once the size is verified, the focus shifts to preserving the RX350’s intended stance, ride balance, and clearance with the proper 18-inch or 20-inch fitment.
Which Tire Size Is Right for The 2016 Lexus Trucks RX350
The 2016 Lexus Trucks RX350 uses two primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. Both fitments are radial, but one uses an 18-inch rim and the other uses a 20-inch rim, so the first step is confirming which wheels are on the vehicle before comparing tire choices.
235/55R20 is a modern metric radial size in which 235 identifies the section width in millimeters, 55 is the aspect ratio, R indicates radial construction, and 20 is the rim diameter in inches. On the 2016 Lexus Trucks RX350, this size is tied to the 20-inch wheel fitment and appears on the F Sport as well as certain Base configurations. Its dimensions keep it closely aligned with the vehicle’s intended overall tire height while pairing with a larger wheel. Buyers should confirm the actual wheel package on the vehicle before selecting this size, especially if wheels have been changed.
235/65R18 is a metric radial size that uses a 235-millimeter section width, a 65-series profile, radial construction, and an 18-inch rim diameter. For the 2016 Lexus Trucks RX350, this size belongs to the 18-inch wheel setup found on certain Base models rather than the F Sport configuration. The overall diameter remains very close to the 20-inch fitment, but the wheel diameter is different enough that correct tire selection starts with wheel confirmation. This is the size to evaluate when the RX350 is still running its 18-inch wheel package or an equivalent setup.
Sub-model fitment matters on the 2016 Lexus Trucks RX350 because tire size is tied to wheel package and trim. The Base can use either 18-inch or 20-inch fitment, while the F Sport stays with the 20-inch radial size, so identifying the exact configuration is the first step.
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2016 Lexus Trucks RX350 Base
The 2016 Lexus Trucks RX350 Base can use either of the two primary radial tire sizes, depending on whether it has the 18-inch or 20-inch wheel setup. Tire selection starts with confirming the wheels currently on the vehicle, then matching the tire size to maintain proper fitment and clearance.
The 2016 Lexus Trucks RX350 F Sport uses the 235/55R20 radial size with the 20-inch wheel package. That keeps the fitment question straightforward, but it is still worth verifying the actual wheels if the vehicle has seen aftermarket changes or replacement rims.
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
Questions about 2016 Lexus Trucks RX350 tires usually come down to size, wheel diameter, sub-model differences, and confirming the correct radial fitment. The FAQs below focus on practical selection, wheel changes, and the checks that matter before regular road use.
Tire Size & Fitment
What tire size fits a 2016 Lexus Trucks RX350?
The 2016 Lexus Trucks RX350 uses two primary tire sizes: 235/65R18 and 235/55R20. Both are radial fitments, and the correct size depends on the wheel package and sub-model. The Base can use either size, while the F Sport uses 235/55R20.
Choosing between them starts with confirming the wheel diameter actually on the vehicle. An 18-inch wheel takes 235/65R18, and a 20-inch wheel takes 235/55R20. If the RX350 has replacement wheels or a used-vehicle history, checking the tire sidewall and wheel size before purchase helps avoid a mismatch.
What size rim does a 2016 Lexus Trucks RX350 use?
The 2016 Lexus Trucks RX350 uses either an 18-inch or 20-inch rim, depending on configuration. The 235/65R18 tire fits the 18-inch setup, while the 235/55R20 tire fits the 20-inch setup. Both sizes are part of the model’s standard radial fitment pattern.
Wheel diameter is the first thing to verify because the two tire sizes are not interchangeable across 18-inch and 20-inch rims. A quick check of the wheel itself or the size molded into the current tire sidewall usually answers the question. That matters even more if the vehicle has aftermarket wheels or a previous owner changed the package.
Do all 2016 Lexus Trucks RX350 sub-models use the same tire size?
No, not all 2016 Lexus Trucks RX350 sub-models use the same tire size. The F Sport uses 235/55R20, while the Base can use either 235/65R18 or 235/55R20 depending on its wheel setup. Both fitments are radial, but they are tied to different rim diameters.
That means trim name alone is helpful, but wheel confirmation is still important on a Base model. A Base RX350 with 18-inch wheels needs a different tire than one equipped with 20-inch wheels. Checking both the sub-model and the actual wheel size keeps the fitment decision accurate.
Choosing the Right Tire
What should I consider when choosing a tire for a 2016 Lexus Trucks RX350?
The first consideration is using the correct size for the wheel package: 235/65R18 for an 18-inch setup or 235/55R20 for a 20-inch setup. Both are radial sizes, so the main fitment question is not construction type but matching the tire to the vehicle’s actual rim diameter and sub-model configuration.
After size is confirmed, compare the tire’s intended use with how the RX350 is driven. Daily road use, seasonal conditions, and ride preference all matter, but the tire still needs to maintain proper wheel compatibility and clearance. On a used RX350, it is smart to verify that previous wheel changes did not alter the intended fitment.
How do I choose between the available 2016 Lexus Trucks RX350 tire sizes?
The choice between 235/65R18 and 235/55R20 is determined by the wheel diameter on the vehicle, not by personal preference alone. The 18-inch fitment belongs to one wheel package, and the 20-inch fitment belongs to another. The Base may have either, while the F Sport uses the 20-inch size.
That makes the decision straightforward once the wheels are identified. A larger wheel setup requires the 20-inch tire size, while the 18-inch wheel package requires the matching 18-inch size. Any time the RX350 has replacement rims, checking both wheel diameter and clearance before ordering helps prevent an expensive fitment mistake.
What does 235/55R20 mean on a 2016 Lexus Trucks RX350?
In 235/55R20, the 235 is the tire’s nominal section width in millimeters, 55 is the aspect ratio, R means radial construction, and 20 is the rim diameter in inches. On the 2016 Lexus Trucks RX350, this is the 20-inch fitment used on the F Sport and certain Base configurations.
Understanding that code helps separate width, profile, and wheel size into practical fitment checks. The most important number for purchase accuracy is the final 20, because it must match the wheel diameter exactly. Buyers comparing tires should also keep the full size together rather than focusing on width alone.
Restoration & Appearance
Does correct tire fitment matter for a 2016 Lexus Trucks RX350 restoration?
Yes, correct tire fitment still matters on a 2016 Lexus Trucks RX350, even though it is a modern vehicle rather than a traditional restoration-era classic. Using the proper 235/65R18 or 235/55R20 size helps preserve the intended stance, wheel-to-tire proportion, and general appearance of the original wheel package.
Appearance can change noticeably when the wrong aspect ratio or rim diameter is used, especially on a crossover with large wheel openings. Anyone trying to return the vehicle to a clean, stock-style presentation should verify the sub-model, wheel size, and existing setup before selecting replacement tires or wheels.
How does tire size affect the appearance of a 2016 Lexus Trucks RX350?
Tire size has a direct effect on how a 2016 Lexus Trucks RX350 sits and how the wheel package fills the wheel openings. The model uses either 235/65R18 or 235/55R20, and each size is proportioned around a different rim diameter while staying close in overall tire height.
That means appearance changes can happen even when the vehicle still looks close to stock at a glance. A mismatched size can alter sidewall profile, wheel-to-tire balance, and the visual character of the RX350. Matching the tire to the intended 18-inch or 20-inch setup keeps the presentation more consistent.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2016 Lexus Trucks RX350?
Yes, modifications can affect tire fitment on a 2016 Lexus Trucks RX350. Wheel changes, altered offsets, suspension lowering, or non-stock rim widths can all change how a 235/65R18 or 235/55R20 tire sits in the wheel opening. Even when the tire size looks correct, the overall setup may no longer match stock geometry.
That is why a modified RX350 should be checked for steering clearance, fender clearance, and suspension travel before replacement tires are chosen. Buyers should also confirm the actual wheel diameter currently on the vehicle, since an aftermarket wheel package may differ from the original sub-model specification.
What should I inspect before driving a 2016 Lexus Trucks RX350 on new tires?
Before driving a 2016 Lexus Trucks RX350 on new tires, inspect basic installation and condition points such as correct size, proper seating on the rim, visible sidewall condition, and consistent air pressure. The vehicle should also be checked for any obvious rubbing at the fenders or suspension during straight-ahead and turning positions.
A short follow-up inspection after the first miles is also worthwhile. Recheck pressure, look for uneven contact marks, and make sure the wheel hardware and overall ride feel remain normal. That is especially important when the RX350 has replacement wheels, recent suspension work, or a history of fitment changes.
What should I check before a longer drive in a 2016 Lexus Trucks RX350?
Before a longer drive, confirm that the 2016 Lexus Trucks RX350 is on the correct tire size for its wheel package and that the tires show no cracking, bulges, cuts, or unusual wear. Pressure should be checked cold, and the tread should be inspected for uneven patterns that may point to alignment or suspension issues.
A longer trip also makes it worth checking age and general condition, especially on a vehicle that spends long periods parked. Tires can look acceptable at a glance yet still have age-related concerns. Verifying clearance, pressure stability, and overall condition helps the RX350 stay more predictable on the road.
