The 2018 Lexus Trucks LX570 sits in the modern full-size luxury SUV class with the kind of road presence, long-distance comfort, and off-pavement capability that made it a standout among premium utility vehicles. Buyers looking at one today are often balancing original character with practical road use, especially when replacing aging factory-size rubber. This LX570 uses radial tires in either 275/50R21 or 285/50R20, so the first tire decision is tied directly to wheel diameter. From there, the focus shifts to matching the existing wheel setup, maintaining the right overall stance, and choosing a tire that suits how the vehicle is driven and presented.
Which Tire Size Is Right for The 2018 Lexus Trucks LX570
The 2018 Lexus Trucks LX570 uses two primary tire sizes, and the correct choice depends first on the wheel diameter currently on the vehicle. One fitment uses a 21-inch rim and the other uses a 20-inch rim, with both built as radial tires. Before choosing a replacement, confirm which wheel package the LX570 is wearing now, especially if wheels have ever been changed from the original setup.
A 275/50R21 tire uses a 275-millimeter nominal section width, a 50-series aspect ratio, radial construction, and a 21-inch rim diameter. On the 2018 Lexus Trucks LX570, this is one of the two primary fitments and is tied specifically to a 21-inch wheel package. Modern metric radial sizing is familiar to late-model SUV owners and is intended to balance width, sidewall height, and road manners. This size is the right starting point when the vehicle already has 21-inch wheels and the goal is to keep the existing wheel diameter and overall fitment theme in place.
A 285/50R20 tire carries a 285-millimeter nominal section width, a 50-series profile, radial construction, and a 20-inch rim diameter. For the 2018 Lexus Trucks LX570, it serves as the alternate primary fitment and belongs on a 20-inch wheel setup rather than the 21-inch package. The slightly different width and rim combination mean it should be treated as its own fitment path, not simply a styling variation. This size makes sense when the LX570 is already equipped with 20-inch wheels and the goal is to replace tires without changing the current wheel diameter.
The covered sub-model fitment is straightforward, but it still requires a wheel check because the LX570 Base can use either of the two primary tire sizes. The key step is confirming whether the vehicle has 20-inch or 21-inch wheels before choosing a replacement tire.
1
2018 Lexus Trucks LX570 Base
The 2018 Lexus Trucks LX570 Base uses radial tires and can be fitted with either 275/50R21 or 285/50R20, depending on the wheel package on the vehicle. Tire selection starts with confirming the installed rim diameter, then choosing a replacement size that matches that wheel setup rather than switching sizes casually.
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
These FAQs focus on the two tire sizes used on the 2018 Lexus Trucks LX570, along with rim-diameter confirmation, selection factors, and the checks that matter before putting a luxury SUV back into regular road use.
Tire Size & Fitment
What tire size fits a 2018 Lexus Trucks LX570?
The 2018 Lexus Trucks LX570 uses two primary tire sizes: 275/50R21 and 285/50R20. Both are radial tire fitments, and each size corresponds to a different wheel diameter, so they are not chosen interchangeably without confirming the wheels on the vehicle.
The practical first step is to check whether the LX570 currently has 21-inch or 20-inch rims. That matters more than anything else, because the tire must match the actual wheel diameter already installed. If the SUV has had wheel changes at any point, confirm the current setup before ordering replacement tires.
What size rim does a 2018 Lexus Trucks LX570 use?
A 2018 Lexus Trucks LX570 can use either a 21-inch rim with 275/50R21 tires or a 20-inch rim with 285/50R20 tires. Both wheel diameters are part of the vehicle's primary fitment range, so rim size must be verified before selecting tires.
The easiest mistake on this vehicle is assuming all LX570s use the same wheel diameter. Looking at the sidewall on the current tire or measuring the wheel will quickly confirm whether the SUV is set up for 20-inch or 21-inch tires. That check prevents ordering the correct-looking size for the wrong wheel.
Why does the 2018 Lexus Trucks LX570 have more than one tire size?
The 2018 Lexus Trucks LX570 has more than one tire size because it was fitted with two different wheel diameters: 275/50R21 on 21-inch rims and 285/50R20 on 20-inch rims. Both sizes are legitimate primary fitments for this model year and sub-model coverage.
That means the correct tire is determined by the wheel package actually on the SUV, not by the model name alone. On a vehicle like the LX570, wheel changes are also common over time, so confirming the existing setup is more reliable than assuming one size applies to every example on the road today.
Choosing the Right Tire
What should I consider when choosing a 275/50R21 or 285/50R20 tire for a 2018 Lexus Trucks LX570?
Start with the correct size for the wheel already on the vehicle, because the 2018 Lexus Trucks LX570 uses either 275/50R21 or 285/50R20 depending on rim diameter. Both are radial fitments, so the central decision is not bias-ply versus radial, but matching the exact wheel setup and intended use.
Once the size is confirmed, compare factors such as tire category, road-use priorities, and how the vehicle is driven. A luxury SUV like the LX570 benefits from a tire that suits its weight and everyday use, but the right starting point is always correct sizing, proper wheel compatibility, and adequate clearance in the current setup.
How do I choose between the available 275/50R21 and 285/50R20 tires for a 2018 Lexus Trucks LX570?
The choice between 275/50R21 and 285/50R20 is made by the wheel diameter already fitted to the 2018 Lexus Trucks LX570. A 21-inch wheel requires 275/50R21, while a 20-inch wheel requires 285/50R20. These are two separate fitments rather than two versions of the same tire choice.
After that, the comparison becomes about selecting a tire within the correct size, not moving between the two sizes casually. Check the wheel size first, then consider how the LX570 is used, whether it stays close to stock, and whether any suspension or wheel changes could affect clearance or overall tire presentation.
How important is wheel confirmation when buying tires for a 2018 Lexus Trucks LX570?
Wheel confirmation is the most important first step on a 2018 Lexus Trucks LX570 because this model uses both 20-inch and 21-inch tire-and-wheel combinations. Ordering by model alone can lead to the wrong size if the current vehicle setup has not been checked carefully.
Looking at the sidewall on the existing tires will usually provide the quickest answer, since both correct sizes are clearly marked there. If the SUV was purchased used or has aftermarket wheels, double-check the actual wheel diameter before comparing tires. That simple inspection avoids fitment problems before any other selection decisions begin.
Restoration & Appearance
Does correct tire fitment matter for a 2018 Lexus Trucks LX570 restoration or preservation project?
Correct tire fitment matters on a 2018 Lexus Trucks LX570 because the tire size affects the vehicle's stance, wheel-to-tire proportion, and overall presentation. Since this model uses either 275/50R21 or 285/50R20, matching the tire to the wheel package helps preserve the look and character of the SUV.
For a preservation-minded owner, staying with the proper size for the installed wheels usually keeps the vehicle looking more cohesive than experimenting with mismatched dimensions. If appearance accuracy is especially important, inspect the current wheel setup carefully and confirm whether the LX570 remains on its original-diameter wheels before replacing the tires.
How does tire size affect the appearance of a 2018 Lexus Trucks LX570?
Tire size has a visible effect on the appearance of a 2018 Lexus Trucks LX570 because the model uses either 275/50R21 or 285/50R20, each paired with a different wheel diameter. Even when overall proportions are close, the relationship between sidewall height and wheel face changes the vehicle's visual balance.
Owners who want to maintain a clean, original-style presentation should replace tires with the size that matches the wheels already on the SUV. Jumping to a different wheel-and-tire combination changes more than numbers on paper. It can alter the visual stance, fill in the wheel openings differently, and move the vehicle away from its intended look.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Lexus Trucks LX570?
Yes, modifications can affect tire fitment on a 2018 Lexus Trucks LX570. Even though the primary sizes are 275/50R21 and 285/50R20, changes such as aftermarket wheels, altered wheel offset, suspension adjustments, or body modifications can influence how much clearance the tire has during turning and suspension travel.
Any LX570 that no longer sits on its original-style wheel and suspension setup deserves a careful fitment check before new tires are installed. Inspect clearance at the fenders, inner liners, and steering range, and verify that the tire size matches the actual wheel diameter. Those checks matter more once the vehicle has been modified.
What should I inspect before driving a 2018 Lexus Trucks LX570 on new tires?
Before driving a 2018 Lexus Trucks LX570 on new tires, confirm that the tire size matches the wheel diameter, then inspect inflation pressure, lug torque, and visible clearance around the suspension and body. It is also wise to make sure the tires seat properly and that there are no signs of rubbing at full steering lock.
A short test drive followed by a second visual check is a smart habit on a heavy luxury SUV. Listen for rubbing, feel for vibration, and recheck the tires for any unusual contact marks. Catching a fitment or installation issue early is far easier than discovering it after a longer highway drive.
How often should tires on a 2018 Lexus Trucks LX570 be inspected?
Tires on a 2018 Lexus Trucks LX570 should be inspected regularly, not just when tread looks worn. Check them before longer trips and at routine intervals for pressure loss, uneven wear, cuts, bulges, embedded debris, and sidewall damage. On a vehicle of this size and weight, small problems can become more serious if ignored.
Frequent inspection is especially important if the SUV sees mixed use, long periods of storage, or occasional towing and highway driving. A quick look at tread condition and sidewalls, along with pressure checks when the tires are cold, helps maintain safe road manners and can reveal alignment or suspension issues before they become expensive.
