2018 Infiniti Trucks covered a wide spread of luxury crossover and SUV roles, from the compact QX30 to the family-focused QX60 and the full-size QX80. That means tire fitment for 2018 Infiniti Trucks is not a one-size-fits-all question, because each model uses its own set of radial sizes and wheel diameters. Across the three models, six sizes appear in total, and the practical choice starts with identifying the correct model and then confirming whether your vehicle is on its 18-, 19-, 20-, or 22-inch fitment. Getting that right first will point you toward the proper size before you compare tread design, load capacity, or intended driving use.
Which Tire Size Is Right for Your 2018 Infiniti Trucks
2018 Infiniti Trucks vehicles use six tire sizes, and they vary by model rather than being shared across the full range. Since all six are radial metric sizes but they do not share a common rim diameter, the first step is confirming your exact model and wheel diameter before looking at individual tire options. Understanding that distinction before choosing a product saves time and helps ensure the right match.
Year(s): 2018|Fit(s): QX30|Construction: Radial|Rim: 18 in
235/50R18 is a radial metric size with a 235-millimeter section width, a stated 50-series profile, and an 18-inch rim diameter. This QX30-specific size is available from BFGoodrich and Nitto in Blackwall form, and speed ratings vary by product with W-rated options to 168 mph. It suits owners who need the 18-inch QX30 fitment and want a modern radial tire choice with a performance-oriented character.
Year(s): 2018|Fit(s): QX30|Construction: Radial|Rim: 19-in rim
235/45R19 is a radial metric size that uses a 235-millimeter section width, a 45-series profile, and a 19-inch rim diameter. This size is specific to QX30 applications rather than the full 2018 Infiniti Trucks range. It is the right path for QX30 owners running the 19-inch wheel package and should be matched to the exact wheel before choosing among available product styles.
Year(s): 2018|Fit(s): QX60|Construction: Radial|Rim: 20-in rim
235/55R20 is a radial metric size with a 235-millimeter section width, a 55-series profile, and a 20-inch rim diameter. This fitment belongs to the QX60 rather than every 2018 Infiniti Trucks model. It is the size to follow for QX60 vehicles equipped with the larger wheel setup, where confirming the wheel diameter matters more than comparing construction types because the fitment remains radial throughout.
Year(s): 2018|Fit(s): QX60|Construction: Radial|Rim: 18-in rim
235/65R18 is a radial metric size using a 235-millimeter section width, a 65-series profile, and an 18-inch rim diameter. This size is specific to QX60 applications and is not shared across the other 2018 Infiniti Trucks models. It is the appropriate starting point for QX60 owners on 18-inch wheels who want to keep the correct overall fitment before narrowing the choice by brand or tread style.
Year(s): 2018|Fit(s): QX80|Construction: Radial|Rim: 22-in rim
275/50R22 is a radial metric size with a 275-millimeter section width, a 50-series profile, and a 22-inch rim diameter. This size is unique to the QX80 within the 2018 Infiniti Trucks lineup. It fits the larger-wheel QX80 setup and should be chosen only after confirming that the vehicle is equipped with the 22-inch wheel package.
Year(s): 2018|Fit(s): QX80|Construction: Radial|Rim: 20-in rim
275/60R20 is a radial metric size that combines a 275-millimeter section width, a 60-series profile, and a 20-inch rim diameter. This fitment is specific to the QX80 and does not cross over to the QX30 or QX60. It is the correct direction for QX80 owners using the 20-inch wheel fitment, with model and wheel verification coming before any product comparison.
Three 2018 Infiniti Trucks models are covered here: QX30, QX60, and QX80. They do not share the same tire sizes, so identifying the correct model is essential before choosing a size. Select your model below to narrow the fitment history and see the tire options that match its wheel packages.
2018 Infiniti Trucks QX30
The 2018 Infiniti Trucks QX30 was the compact entry in the lineup, blending a hatchback-like footprint with luxury crossover styling. Its tires mount on either 18-inch or 19-inch wheels, depending on configuration, so wheel diameter is the key first check before moving on to product selection.
The 2018 Infiniti Trucks QX60 served as the brand's three-row luxury crossover, aimed at family use with a smoother, more comfort-oriented character than the smaller QX30. Its fitments mount on either 18-inch or 20-inch wheels, making wheel diameter the main separator between its two sizes.
The 2018 Infiniti Trucks QX80 was the full-size luxury SUV in the range, with a larger stance and heavier-duty presence than the crossover models below it. Its tires mount on either 20-inch or 22-inch wheels, so the correct wheel package determines the correct tire size.
Four products are available across one tire size for 2018 Infiniti Trucks vehicles. The 235/50R18 offers four radial choices from BFGoodrich and Nitto, all in Blackwall form. Confirm your exact size first, since product coverage here does not extend across every 2018 Infiniti Trucks fitment and speed ratings vary within the size.
These FAQs focus on how 2018 Infiniti Trucks tire sizes change from QX30 to QX60 to QX80, what the metric sizing codes mean, and what to confirm about wheel diameter, radial construction, storage, and road use before making a final choice.
Size Basics & Fitment
What tire sizes fit 2018 Infiniti Trucks vehicles?
2018 Infiniti Trucks vehicles use six different tire sizes across three models. The QX30 uses 235/50R18 and 235/45R19, the QX60 uses 235/55R20 and 235/65R18, and the QX80 uses 275/50R22 and 275/60R20. All six are radial metric sizes, and the rim diameters span 18, 19, 20, and 22 inches rather than staying on one common wheel size.
That means year and make alone are not enough to choose a tire for 2018 Infiniti Trucks. You need to confirm the exact model first, then verify the wheel diameter already on the vehicle. Once those two pieces match, the correct tire size becomes much easier to narrow down and compare.
What does 235/50R18 mean on a 2018 Infiniti Trucks tire?
On a 2018 Infiniti Trucks tire, 235/50R18 means the tire is 235 millimeters wide, has a 50-series aspect ratio, uses radial construction, and mounts on an 18-inch wheel. In the 2018 Infiniti Trucks range, that exact size belongs to the QX30. Available examples in this size carry W speed ratings, and load figures reach 1,819 pounds at 50 psi on some products.
That code matters because a 235/50R18 is not interchangeable with a 235/45R19 or a 235/65R18 just because the first number looks similar. The profile and wheel diameter change the tire's overall shape and fitment. If your QX30 is on 18-inch wheels, this is the size family to confirm against the sidewall before choosing a brand.
Do all 2018 Infiniti Trucks models use the same tire size?
No, 2018 Infiniti Trucks models do not use the same tire size. The QX30, QX60, and QX80 each have their own two-size range, and none of the six sizes is shared across all three models. Even the 18-inch fitments differ, with the QX30 using 235/50R18 and the QX60 using 235/65R18.
That difference is important because the model name and the wheel diameter both affect the correct fitment. A buyer comparing used wheels, replacing one tire, or matching a spare should confirm both the model and the exact sidewall size already on the vehicle. That approach avoids mixing similar-looking metric sizes that were intended for different Infiniti applications.
Buying the Right Tire
What sidewall styles are available for 2018 Infiniti Trucks tires?
Within the current 2018 Infiniti Trucks product coverage here, the 235/50R18 is available in Blackwall form. That gives the QX30's 18-inch fitment a clean, modern appearance that suits the late-model luxury crossover character of the vehicle. No wide whitewall or vintage-style sidewall treatment appears in this fitment range.
For most 2018 Infiniti Trucks owners, sidewall choice is less about period-correct restoration and more about matching the original late-model look of the vehicle. Blackwall tires usually align best with that appearance. If visual consistency matters, compare the sidewall style on the vehicle now with the replacement tire you are considering so the set matches from corner to corner.
What brands make tires for 2018 Infiniti Trucks vehicles?
For the 2018 Infiniti Trucks 235/50R18 fitment, tires are available from BFGoodrich and Nitto. BFGoodrich covers several options in that size, while Nitto also offers a performance-oriented radial choice. All of them are Blackwall radial tires sized for the QX30's 18-inch application.
Brand choice on 2018 Infiniti Trucks often comes down to the exact size you need first, then the tread personality you prefer within that size. If your vehicle uses one of the QX60 or QX80 fitments, start by confirming the sidewall code on the vehicle before comparing brands, since those models use different dimensions and wheel diameters.
What is the difference between BFGoodrich g-Force Sport Comp 2 and Nitto NT555 G2 for the 2018 Infiniti Trucks?
For the 2018 Infiniti Trucks 235/50R18 size, the BFGoodrich g-Force Sport Comp 2 and the Nitto NT555 G2 are both radial Blackwall tires with W speed ratings. The BFGoodrich version carries a 6.5 to 8.5-inch rim width range and weighs 26 pounds, while the Nitto uses a 6.5 to 8.5-inch approved range with a 7.5-inch measuring width and weighs 27.86 pounds. The Nitto also shows a 1,819-pound maximum load at 50 psi.
Those differences matter when you are matching the tire to the wheel and comparing small setup details rather than changing the vehicle's fitment. Either way, the tire still needs to suit the QX30's 18-inch application. Checking the wheel width before ordering is the smart next step when two tires share the same nominal size but vary slightly in specification.
Fitting & Setup
What rim width do 2018 Infiniti Trucks tires require?
For the 2018 Infiniti Trucks 235/50R18 size, approved rim widths run from 6.5 to 8.5 inches across the available radial products. One version identifies 7.5 inches as the measuring width within that same general range. That fitment belongs to the QX30 on 18-inch wheels.
Rim width matters because the tire may mount on the correct diameter wheel and still be a poor match if the wheel is too narrow or too wide. Before replacing only the tires on a 2018 Infiniti Trucks QX30, confirm the actual wheel width stamped on the wheel or verify it through the wheel manufacturer. That prevents avoidable fit and handling issues.
Do 2018 Infiniti Trucks tires require inner tubes?
The 2018 Infiniti Trucks 235/50R18 products here are modern radial tires with no tube-type markings in the size description, which points to tubeless construction for that fitment. That aligns with normal late-model crossover practice, where the tire and wheel are intended to seal without an inner tube. No tube-related variation appears within the covered 235/50R18 products.
Even so, the wheel itself still matters. If a 2018 Infiniti Trucks vehicle has aftermarket wheels, damaged bead seats, or corrosion around the sealing surface, the issue may be with the wheel rather than the tire. A clean wheel inspection and fresh valve stems are worthwhile whenever a tubeless radial set is being installed.
Maintenance, Storage & Longevity
How should I store a 2018 Infiniti Trucks when the tires are fitted?
A 2018 Infiniti Trucks should be stored away from direct sunlight, ozone sources such as electric motors and battery chargers, and prolonged contact with standing moisture. Keep the tires properly inflated, park on a clean surface, and move the vehicle periodically if it will sit for long stretches. Modern radials resist flat-spotting better than older bias-ply designs, but long static storage can still stress the casing and sidewalls.
Practical storage care is especially useful on luxury crossovers and SUVs that may spend part of the year unused. If the vehicle will remain parked for months, some owners use tire cradles or place the vehicle on stands after proper preparation. The goal is to reduce concentrated load, preserve sidewall condition, and avoid discovering a vibration or pressure loss on the first drive back out.
How long do tires on a 2018 Infiniti Trucks typically last?
Tire life on a 2018 Infiniti Trucks should be judged by age and condition as much as tread depth. A good rule is to begin careful evaluation around five to seven years and to treat the ten-year point as a serious replacement consideration, even on low-mileage vehicles. The DOT date code on the sidewall tells you when each tire was made.
That matters because many luxury SUVs and crossovers accumulate age faster than mileage. A tire can look usable at a glance yet still be aging out structurally. If a 2018 Infiniti Trucks has one older tire mixed with newer ones, compare the date codes across all four corners and the spare so you are making decisions with the full age picture in mind.
How often should tires on a 2018 Infiniti Trucks be inspected?
Tires on a 2018 Infiniti Trucks should be inspected before every drive and given a more thorough check before any longer highway trip. Look for sidewall cracking, cuts, punctures, uneven wear, bulges, and pressure loss. On tubeless late-model fitments, valve stems and bead sealing surfaces deserve attention along with the tread and sidewall.
Routine inspection is one of the easiest ways to catch problems before they become roadside failures. It is especially important on vehicles that alternate between daily use and long idle periods, because low pressure and hidden sidewall damage can develop quietly. A quick walk-around plus a pressure check takes only minutes and gives far more confidence before a family trip or extended commute.
Safety & Road Use
Are 2018 Infiniti Trucks tires safe for highway driving?
Yes, properly sized and properly maintained 2018 Infiniti Trucks tires are suitable for normal highway driving, and the covered 235/50R18 products carry W speed ratings with a 168 mph ceiling. That rating is far above ordinary U.S. highway speeds. On a modern Infiniti crossover, overall safety at real-world speeds depends just as much on inflation, alignment, suspension condition, and braking health as it does on the tire's speed symbol.
The useful takeaway is not to chase a higher speed rating for its own sake, but to make sure the tire matches the vehicle's original size and intended use. A fresh, correctly inflated tire in the proper load range is more meaningful than a headline rating. Before a long interstate run, verify pressure when cold and inspect the tire for any visible damage.
What inflation pressure should I use for 2018 Infiniti Trucks tires?
Inflation pressure for 2018 Infiniti Trucks should follow the vehicle placard or owner's manual for the exact model and wheel package, not a generic number borrowed from another Infiniti fitment. Within the covered 235/50R18 products, maximum load figures reach 1,609 pounds at 51 psi and 1,819 pounds at 50 psi on certain tires, but those are maximum-rated figures rather than a blanket operating recommendation for every application.
Use the factory vehicle recommendation as the starting point for daily service because it reflects the suspension tuning, curb weight, and intended use of that specific model. Then make sure the replacement tire's own rated pressure and load capacity align with that need. This is especially important when comparing two tires of the same size that may have different load indexes or XL markings.
What should I check before taking a 2018 Infiniti Trucks on a longer drive?
Before taking a 2018 Infiniti Trucks on a longer drive, inspect each tire for cracking, punctures, cuts, bulges, uneven wear, and proper cold inflation pressure. Check the valve stems, make sure the spare is serviceable, and confirm that all four road tires match the correct size for the vehicle. On a late-model SUV or crossover, uneven wear can also hint at alignment or suspension issues that deserve attention before the trip.
Tires are only one part of the pre-drive checklist, but they are one of the easiest to inspect and one of the most critical at highway speed. It is worth adding a quick check of brakes, fluids, lights, and wipers before setting off. A few minutes in the driveway can prevent a minor tire concern from becoming a much larger travel problem.
