The 2020 Lexus Trucks RX350 sits in the modern luxury crossover space, where quiet highway manners, everyday usability, and upscale road feel matter just as much as styling. For owners, that makes tire choice less about vintage construction questions and more about matching the vehicle’s wheel setup and intended use. This RX350 uses radial tires, with fitment centered on either 235/65R18 or 235/55R20 depending on configuration. The decision usually comes down to confirming whether the vehicle carries the 18-inch or 20-inch wheel package, then choosing the right tire within that size. Appearance, ride character, and replacement planning all start with that wheel-and-size check.
Which Tire Size Is Right for The 2020 Lexus Trucks RX350
The 2020 Lexus Trucks RX350 uses two primary tire sizes, and the first step is confirming which wheel diameter is on the vehicle. Fitment varies by sub-model and wheel package, with both sizes built as radial tires but split between 18-inch and 20-inch rims. Before comparing tire choices, identify the exact sub-model and verify the wheels currently installed, especially if the RX350 has been changed from its original setup.
A 235/55R20 tire uses a 235-millimeter nominal section width, a 55-series aspect ratio, radial construction, and a 20-inch rim diameter. On the 2020 Lexus Trucks RX350, this size is part of the larger-wheel fitment and is also used on the RX350 F Sport. Its lower-profile metric radial format gives the buyer a more wheel-package-specific fitment to verify than older collector sizes typically require. This is the size to evaluate when the vehicle is already equipped with 20-inch wheels and the goal is to stay with the proper modern radial format for that setup.
A 235/65R18 tire carries the same 235-millimeter nominal width but pairs it with a 65-series aspect ratio, radial construction, and an 18-inch rim diameter. For the 2020 Lexus Trucks RX350, this size applies to certain Base-model configurations using the smaller wheel diameter. Compared with the 20-inch fitment, the key distinction is not construction but wheel size and overall package selection. This is the size to pursue when the RX350 has 18-inch wheels and you want to match the correct modern radial fitment for that configuration.
Sub-model fitment matters on the 2020 Lexus Trucks RX350 because tire size changes with configuration. The main question is whether the vehicle is a Base model with either 18-inch or 20-inch fitment potential, or an F Sport using the 20-inch radial size.
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2020 Lexus Trucks RX350 Base
The 2020 Lexus Trucks RX350 Base can use either of the two primary radial tire sizes, so wheel confirmation is essential before choosing a replacement. For this sub-model, the buying decision starts with identifying whether the vehicle is riding on 18-inch or 20-inch rims rather than assuming one size applies to every Base example.
The 2020 Lexus Trucks RX350 F Sport uses the 235/55R20 radial fitment. That makes selection more straightforward, but it is still wise to confirm the current wheel setup if the vehicle has seen aftermarket wheel changes or other modifications since new.
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
Owners of a 2020 Lexus Trucks RX350 usually need clarity on the correct tire size, the difference between the 18-inch and 20-inch fitments, and what to inspect before replacing tires on a modern luxury crossover.
Tire Size & Fitment
What tire size fits a 2020 Lexus Trucks RX350?
The 2020 Lexus Trucks RX350 uses either 235/55R20 or 235/65R18, both in radial construction. The correct size depends on the vehicle’s exact configuration and wheel package, with the F Sport using 235/55R20 and the Base model appearing with either size depending on setup.
The most important step is checking the wheel diameter actually on the vehicle before ordering replacement tires. A Base model cannot be assumed to use one universal size, and an RX350 with changed wheels should be verified by reading the current tire sidewall and confirming the rim diameter before comparing replacement options.
What size rim does a 2020 Lexus Trucks RX350 use?
A 2020 Lexus Trucks RX350 uses either an 18-inch rim or a 20-inch rim, depending on tire size and configuration. The 235/65R18 fitment uses an 18-inch wheel, while the 235/55R20 fitment uses a 20-inch wheel.
That difference matters because tire size must match the wheel diameter exactly. Before selecting tires, confirm whether the vehicle still has its intended wheel package or has been changed to aftermarket rims, since the right replacement starts with the wheel currently installed rather than the badge alone.
Do all 2020 Lexus Trucks RX350 sub-models use the same tire size?
No, the 2020 Lexus Trucks RX350 does not use one single tire size across every sub-model. The F Sport uses 235/55R20, while the Base model can appear with either 235/55R20 or 235/65R18 depending on the wheel setup on that vehicle.
That means sub-model name helps, but wheel verification is still the real fitment checkpoint. On a Base RX350, the safest approach is to confirm the actual tire sidewall and wheel diameter before replacing anything, especially if the crossover was purchased used or may have had tires and wheels changed previously.
Choosing the Right Tire
What should I consider when choosing a tire for a 2020 Lexus Trucks RX350?
Start with the correct primary size for the vehicle’s current wheel setup: 235/55R20 or 235/65R18. Since both fitments are radial, the main selection factors are correct sizing, wheel diameter match, the intended ride and appearance balance, and whether the RX350 is a Base model or F Sport.
A useful next step is checking the current tires for matching size across all four corners and confirming the wheels have not been changed. Luxury crossovers respond noticeably to tire choice, so selecting the proper size first helps preserve the vehicle’s intended stance, clearance, and everyday road manners.
How do I choose between the available 2020 Lexus Trucks RX350 tire sizes?
The choice is not made by preference alone, because 235/55R20 and 235/65R18 are tied to different wheel diameters. A 20-inch wheel requires the 235/55R20 fitment, while an 18-inch wheel requires the 235/65R18 fitment, so the installed rim size determines which tire size belongs on the vehicle.
Once wheel diameter is confirmed, the decision becomes much simpler. A Base model needs special attention because either size may be present, while an F Sport points more directly to the 20-inch fitment. Reading the existing tire sidewall and confirming wheel size prevents a costly mismatch before replacement begins.
What rim-fitment details should I compare when choosing 2020 Lexus Trucks RX350 tires?
The first rim-fitment detail is diameter, because the 2020 Lexus Trucks RX350 uses either 18-inch or 20-inch wheels. Tire size and wheel diameter must match exactly, so 235/65R18 belongs on an 18-inch rim and 235/55R20 belongs on a 20-inch rim.
Wheel changes can complicate that simple rule, especially on used vehicles. It helps to confirm the current wheel size, inspect whether all four wheels match, and make sure there is no mixing of sizes from a previous owner. That check keeps the replacement process centered on the actual setup now on the vehicle.
Restoration & Appearance
Does correct tire fitment matter for the appearance of a 2020 Lexus Trucks RX350?
Yes, correct tire fitment plays a major role in how a 2020 Lexus Trucks RX350 sits and presents itself. The 235/55R20 and 235/65R18 sizes are close in overall diameter, but they belong to different wheel packages, so the visual balance of tire sidewall and wheel face changes with the setup.
Keeping the proper size for the wheel currently on the vehicle helps maintain a clean, intentional look rather than an improvised one. Owners who value an original-style appearance should confirm whether the crossover still has its intended factory-type wheel package before choosing replacement tires solely by sidewall markings.
Should a 2020 Lexus Trucks RX350 keep its original-style wheel and tire package?
Many owners prefer to keep a 2020 Lexus Trucks RX350 on the wheel and tire size that matches its original configuration, especially when preserving the vehicle’s intended look and overall character matters. That means retaining either the 235/65R18 setup or the 235/55R20 setup rather than mixing sizes casually.
Staying with the original-style package can simplify replacement decisions and helps avoid avoidable fitment questions. Anyone considering a wheel change should compare the new setup carefully against the vehicle’s current clearance, steering range, and overall stance so the crossover still looks and functions as expected.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2020 Lexus Trucks RX350?
Yes, modifications can affect tire fitment on a 2020 Lexus Trucks RX350 even though its factory sizing is straightforward. Wheel changes, suspension alterations, or non-original offsets can change how a 235/55R20 or 235/65R18 tire sits in the wheel opening and how much clearance remains at full steering lock.
That matters most on a used RX350 where prior changes may not be obvious at first glance. A careful inspection of wheel diameter, wheel width, tire sidewall markings, and visible clearance around the fenders and suspension helps confirm that the replacement size matches the vehicle’s actual present-day setup.
What should I inspect before driving a 2020 Lexus Trucks RX350 on new tires?
Before driving a 2020 Lexus Trucks RX350 on new tires, inspect basic setup and condition items such as correct tire size, proper inflation, secure wheel hardware, and any visible clearance concerns. It also helps to confirm that all four tires match in size and that the wheels are the intended 18-inch or 20-inch diameter.
A short visual check after installation can prevent larger issues later. Look for rubbing marks, sidewall contact, uneven seating on the rim, or signs of air loss during the first miles of use. That early inspection is especially worthwhile if the RX350 has aftermarket wheels or recently changed suspension components.
What should I check before a longer drive in a 2020 Lexus Trucks RX350?
Before a longer drive, confirm that the 2020 Lexus Trucks RX350 is riding on the correct tire size for its wheel diameter and that the tires are in sound condition. Check inflation, tread condition, visible cuts or bulges, and any signs of cracking or irregular wear that could point to alignment or suspension issues.
Longer trips put more heat and sustained load into the tires than local driving, so condition matters as much as size. It is also smart to verify that the crossover is not carrying mismatched tires front to rear and that no rubbing appears when the steering is turned through its full range.
