2018 Acura Tire Fitment Guide

2018 Acura vehicles use seven sizes across four models: ILX uses 215/45R17 or 225/40R18, NSX uses 245/35R19 and 305/30R20, RLX uses 245/40R19, and TLX uses 225/55R17, 225/50R18, or 245/40R19. The only shared size across different models is 245/40R19, which appears on the RLX and on selected TLX applications. Rim diameters span 17, 18, 19, and 20 inches, so there is no single Acura-wide fitment for the year.

That spread means the first decision is always model identification, followed by wheel diameter confirmation. Once those two points are settled, you can compare the products available in that exact size for brand, sidewall appearance, speed rating, and rim-width compatibility. This matters especially with the TLX, which appears in three different diameters, and with the NSX, which uses a staggered front-and-rear setup that should be preserved.

On a 2018 Acura, 215/45R17 is a metric radial size code. The 215 is the nominal section width in millimeters, 45 is the aspect ratio, R identifies radial construction, and 17 is the wheel diameter in inches. In this Acura range, that size belongs to the ILX and fits a 17-inch wheel, with products built around rim widths from 7.0 to 8.0 inches.

Reading the code correctly helps separate tire size from trim level assumptions. Two ILX cars can look similar yet use different wheel packages, and the tire must match the wheel diameter exactly. If your sidewall already shows 215/45R17, you can then compare the available Blackwall options within that size and verify that the wheel width falls inside the approved range before choosing a replacement.

No, 2018 Acura models do not use one common tire size. The ILX, NSX, RLX, and TLX each have their own fitment patterns, and only 245/40R19 carries across more than one model. The NSX is especially distinct because it uses two different sizes front to rear, while the TLX alone can appear with 17-, 18-, or 19-inch wheel diameters depending on application.

That means a buyer should not choose a tire on year and make alone, even within one body style family. Check the exact model first, then confirm the size on the current sidewall or the wheel package on the car. That extra step avoids the most common mistake on late-model premium cars: selecting a tire that is correct for the brand and year but wrong for the model or wheel diameter.

Most 2018 Acura sizes here are available in Blackwall form, which is the standard late-model appearance buyers expect on a modern Acura sedan or supercar. Two sizes add extra visual choices: 305/30R20 for the NSX is available in Blackwall, RWL, and Redline, and 225/55R17 for the TLX is available in both Blackwall and Wide Whitewall. Those sidewall treatments change appearance far more than fitment, since the tire still needs to match the exact size and wheel diameter.

For a factory-like look on a 2018 Acura, Blackwall is the natural choice. RWL, Redline, and Wide Whitewall options move the presentation toward a custom or specialty aesthetic rather than contemporary showroom style. If visual authenticity matters to you, start with the sidewall style that matches how you want the car to present, then confirm the product’s other details such as speed rating and approved wheel-width range.

2018 Acura tire coverage here comes from BFGoodrich, Nitto, and Pro-Trac, depending on size. BFGoodrich appears across every size in the range, Nitto is offered in 225/40R18, 245/35R19, and 305/30R20, and Pro-Trac appears in 305/30R20. Brand choice is therefore broadest on some ILX and NSX sizes, while the RLX and most TLX sizes stay centered on BFGoodrich offerings.

The practical takeaway is to choose size first, then compare the brands that exist within that exact fitment instead of assuming every brand covers every Acura application. On a sedan fitment, that often means narrowing among several BFGoodrich performance-oriented radials. On the NSX rear size, brand choice also overlaps with sidewall-style choice, which makes visual preference part of the decision as well.

On 2018 Acura sizes where both appear, BFGoodrich g-Force Sport COMP-2 and BFGoodrich g-Force Phenom T/A share the same basic radial construction and Blackwall appearance, but they differ in some published details such as load figures, speed-rating availability, and weight. In 245/40R19, for example, the Sport COMP-2 carries a 98W marking while the Phenom T/A carries a 98Y marking. In several other sizes, the Phenom T/A also shows slightly different max-load figures from the Sport COMP-2.

That means the comparison is less about one being universally right and more about matching the product character to the exact Acura application and your preferences within that size. If speed rating matters to you, compare the sidewall marking carefully. If wheel-width range or load information is part of your selection process, look at those details size by size rather than assuming the same relationship holds across the full 2018 Acura lineup.

Several 2018 Acura sizes have defined wheel-width ranges. 215/45R17 fits 7.0 to 8.0 inches, 225/40R18 fits 7.5 to 9.0 inches, 245/35R19 fits 8.0 to 9.5 inches where stated, 245/40R19 fits 8.0 to 9.5 inches, 225/55R17 fits from 6.0 to 8.0 inches on most products and up to 9.0 inches on one whitewall radial, and 225/50R18 fits 6.0 to 8.0 inches. Those ranges are tied to the tire size, not just the model name.

Wheel width matters because it affects how the tire sits on the rim and whether the product is being used within its intended envelope. If your car has aftermarket wheels, this check becomes even more important than model-based fitment alone. Confirm the wheel’s actual width before ordering, especially on the ILX and TLX where more than one size can be correct depending on the wheel package.

The 2018 Acura tires covered here are modern radial fitments, and the sidewall markings shown do not use tube-type markings such as TT. Several sizes use ZR and load or speed designations typical of tubeless passenger and performance tires, and no size here presents the kind of vintage tube-only format seen on older collector vehicles. That places these Acura fitments firmly in the modern radial category rather than a tube-required restoration fitment.

Even so, the right setup still depends on the wheel itself being in proper condition and intended for tubeless service. If a wheel has been repaired, modified, or replaced with an aftermarket version, inspect the bead seat and valve-stem condition before mounting new tires. On a 2018 Acura, wheel condition and proper mounting practice matter more than tube choice, because these fitments are designed around contemporary radial tire construction.

Original 2018 Acura wheels cannot be treated as interchangeable across all tire sizes because the lineup uses four different diameters: 17, 18, 19, and 20 inches. An ILX wheel for 215/45R17 will not accept a 225/40R18 tire, and an NSX rear wheel for 305/30R20 is a different application altogether from a 19-inch RLX or TLX wheel. Wheel diameter must match the tire exactly.

Once diameter is correct, wheel width still needs to be checked against the approved range for that specific size. That is especially important when a model had multiple wheel packages or when a car has changed hands and no longer wears its original wheels. On a 2018 Acura, the safest approach is to verify both the size on the tire sidewall and the actual wheel dimensions before moving ahead.

A 2018 Acura stored with tires fitted should be kept away from direct sunlight, standing moisture, and ozone-producing equipment such as electric motors, battery chargers, or welders. Clean, dry storage helps preserve the sidewalls, and maintaining proper inflation reduces the chance of shape distortion during long periods of inactivity. Moving the car occasionally is also helpful so one section of the tread is not carrying the load for months at a time.

If the car will sit for an extended season, many collectors either roll the car periodically or support it in a way that reduces constant loading on one footprint area. That advice applies even to modern radial tires, because age and environment still matter more than mileage on low-use specialty cars. A storage routine that protects the tires also gives you a good chance to catch pressure loss or sidewall aging before the next drive.

On a 2018 Acura, tire age is usually a more useful guide than mileage alone, especially if the car is driven infrequently. A common rule is to begin evaluating tires closely around the five- to seven-year mark and to treat around ten years as a serious replacement point regardless of tread depth. The DOT date code on the sidewall tells you when each tire was made, and that date should be part of any ownership review.

A lightly used Acura can still have aging tires that look acceptable at first glance, particularly if the car has spent time parked indoors and accumulated tread very slowly. Heat cycles, storage conditions, and inflation history all influence service life. If the tires are approaching age limits, have them inspected with the same seriousness you would give brakes or suspension before relying on the car for longer trips.

Tires on a 2018 Acura should be checked before every drive in a quick walk-around and more carefully before any longer outing. Look for cracking, cuts, bulges, uneven wear, and signs of pressure loss, and make sure each tire is still holding inflation consistently. Because several Acura fitments here carry performance-oriented speed ratings, condition and pressure are especially important to stable behavior at highway pace.

A more thorough inspection every few months is a good habit even if the car is not used often. That is the right time to examine inner tread areas, check for wheel damage, and compare wear side to side. Cars with staggered setups, like the NSX, deserve extra attention because front and rear tires differ in size and cannot simply be treated as interchangeable service items.

A 2018 Acura ILX was originally a modern radial-tire car, not a bias-ply or vintage-format application. Within the ILX range here, that means either 215/45R17 or 225/40R18 depending on the wheel package on the car. Both are contemporary metric radial sizes, which is consistent with Acura’s late-model premium sedan positioning and with the broader industry standard for passenger cars in 2018.

If originality matters, begin by confirming which wheel package your specific ILX left the factory with and then match the tire size to that wheel diameter. Brand and tread pattern can vary over time, so the most important authenticity points are size, radial construction, and overall appearance. For trim-specific confirmation, an Acura dealer archive, marque forum, or factory literature is a better authority than memory alone.

Correct tire fitment can matter on a shown 2018 Acura, even though the standards are different from those used for prewar or muscle-era concours cars. Judges and knowledgeable enthusiasts will usually notice an obviously wrong wheel diameter, an incorrect stagger on an NSX, or a custom sidewall style that changes the car’s intended visual character. On a modern Acura, the size and overall presentation tend to matter more than chasing an exact period tread from one production month.

That means a stock-appearing car generally benefits from the proper metric size and a conventional Blackwall look. A redline, RWL, or wide whitewall may be visually intentional, but it shifts the car away from a factory-authentic presentation. If you plan to show the car in a brand-specific or originality-focused setting, verify the wheel package and choose a tire style that supports the car’s original personality rather than competing with it.

For the 2018 Acura TLX in 225/55R17, BFGoodrich g-Force COMP-2 A/S and BFGoodrich Silvertown Radial differ most obviously in sidewall presentation and wheel-width range. The g-Force COMP-2 A/S uses a Blackwall look and fits 6.0 to 8.0-inch rims, while the Silvertown Radial version in this size carries a 1.50-inch Wide Whitewall and a broader stated wheel-width range of 6.00 to 9.00 inches. Both remain radial tires in the same nominal size.

The choice comes down largely to the appearance you want from the car. A Blackwall keeps the TLX in a modern, factory-like visual lane, while the wide whitewall creates a much more custom look. Because the two products present the same size in very different ways, it is worth deciding whether you are preserving the original late-model sedan aesthetic or intentionally moving toward a personalized presentation.

The 2018 Acura tires covered here are modern radial products, and the speed ratings shown are predominantly W, with one 245/40R19 option carrying a Y rating. A W rating corresponds to a 112 mph ceiling, while Y indicates 186 mph and above. Those figures are well beyond normal U.S. highway speeds, so in ordinary road use the bigger question is usually the condition of the tire, wheel, and vehicle rather than the rating alone.

That does not mean every aging tire is automatically suitable for fast highway work. Pressure, alignment, tread condition, and age matter every bit as much as the speed symbol molded into the sidewall. On a 2018 Acura, especially an NSX or a sedan with low-profile fitments, the tire should be treated as one part of the complete roadworthiness picture alongside brakes, suspension, and wheel condition.

Inflation pressure on a 2018 Acura should start with the factory placard or owner’s manual for the exact model and wheel package, because each size was engineered around a specific vehicle application. The tires themselves also carry maximum load and pressure figures in some sizes, such as 1201 pounds at 51 psi for one 215/45R17, 1389 pounds at 50 psi for one 225/40R18, 1653 pounds at 50 psi for certain 245/40R19 products, and 1819 pounds at 50 psi for one 225/55R17. Those numbers are tire ratings, not universal cold inflation recommendations.

The practical rule is simple: do not transfer one pressure figure from an ILX to a TLX, from a 17-inch setup to a 19-inch setup, or from a tire sidewall maximum to everyday use. Use the Acura specification for routine inflation, then make sure the tire you choose is suitable for that application. If the car has aftermarket wheels or nonstandard modifications, verify the setup carefully before settling on pressure.

Before a longer drive in a 2018 Acura, inspect each tire for cuts, bulges, punctures, sidewall cracking, uneven wear, and proper inflation. Check the spare as well if the car carries one, and make sure the valve stems are sound and the wheels show no visible damage. On an NSX, confirm that the front and rear sizes are correct and that the staggered arrangement has not been disturbed by previous service.

A longer-trip inspection should also include the usual vehicle basics for a modern performance or luxury car: brakes, fluids, battery condition, and suspension feel. Tires are the only part of the car touching the road, but they work as part of a system. Catching a marginal tire before departure is especially important on low-profile Acura fitments, where impact damage or slow leaks can become a trip-ending issue more quickly than on taller sidewall tires.