The 2018 Acura RLX sits at the modern end of Acura’s flagship sedan lineage, blending full-size comfort with a distinctly driver-focused character. In Sport Hybrid SH-AWD form especially, the RLX paired luxury-sedan refinement with advanced all-wheel-drive technology, while the Base model kept the same upscale touring mission. Both versions use a 245/40R19 radial tire on a 19-inch rim, so the main decision is not finding the correct primary size but choosing the right tire within it. Available options stay within a blackwall performance-oriented theme, and the focus should be on matching road use, wheel compatibility, and the kind of handling feel you want from the car.
Which Tire Size Is Right for The 2018 Acura RLX
The 2018 Acura RLX uses one primary tire size: 245/40R19. That size is a radial fitment on a 19-inch rim, and it is shared by both the Base and Sport Hybrid SH-AWD sub-models. Because the size stays consistent across the range, the real choice comes down to selecting the right tire series within that fitment and confirming that the wheel on the car still matches the original diameter and width requirements.
245/40R19 is a modern metric radial size in which 245 identifies the nominal section width in millimeters, 40 is the aspect ratio, R indicates radial construction, and 19 is the wheel diameter in inches. On the 2018 Acura RLX, this size supports the car’s modern handling and touring character with a low-profile radial layout. Available choices center on BFGoodrich blackwall tires in the g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A series. This is the size to use when the car retains its correct 19-inch wheel setup and the goal is to preserve proper fitment while comparing tire character within the same size.
Tire fitment is straightforward across the covered 2018 Acura RLX sub-models because both use the same primary size. Checking the exact sub-model still helps confirm the vehicle configuration, but the key fitment decision remains tire selection within the shared 245/40R19 radial size.
1
2018 Acura RLX Base
The 2018 Acura RLX Base uses the same 245/40R19 radial tire size found elsewhere in the RLX lineup. That keeps selection focused on choosing the right blackwall tire series for your driving priorities and verifying that the car still has the correct 19-inch wheel setup.
The 2018 Acura RLX Sport Hybrid SH-AWD also uses a 245/40R19 radial tire. Tire selection here is less about size differences and more about choosing a tire series that suits the car’s more performance-oriented character while confirming wheel width and overall clearance on the vehicle as it sits.
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.
Best 2018 Acura RLX Tires for Sale
Available 245/40R19 options for the 2018 Acura RLX come from BFGoodrich and stay within a blackwall radial performance theme. The main differences in the product grid are tire series, load specification where stated, and shared rim-width compatibility across the 19-inch fitment.
Common 2018 Acura RLX tire questions usually come down to confirming the 245/40R19 fitment, understanding the 19-inch wheel requirement, and comparing available BFGoodrich tire series for road use, maintenance, and long-term ownership.
Tire Size & Fitment
What tire size fits a 2018 Acura RLX?
The 2018 Acura RLX uses a 245/40R19 radial tire. That primary size applies to both the RLX Base and the RLX Sport Hybrid SH-AWD, so the model range stays consistent at the year-make-model level rather than splitting into different tire sizes by sub-model.
That makes the first fitment check fairly simple: confirm that the car still has 19-inch wheels and has not been changed to an aftermarket setup. Once the size is verified, the decision shifts to tire series, intended driving use, and whether the wheel width falls within the tire’s approved range.
What size rim does a 2018 Acura RLX use?
The 2018 Acura RLX uses a 19-inch rim with its 245/40R19 tire fitment. That rim diameter is consistent across the RLX Base and Sport Hybrid SH-AWD configurations covered here, which keeps wheel-diameter identification straightforward for owners replacing tires on an otherwise stock setup.
Rim diameter should still be checked on the car before purchasing, especially if it has changed hands or has seen wheel upgrades. A 245/40R19 tire needs the correct 19-inch wheel, and approved rim width matters as well, particularly when comparing modern performance-oriented radial options.
Do all 2018 Acura RLX sub-models use the same tire size?
Yes. The 2018 Acura RLX Base and the 2018 Acura RLX Sport Hybrid SH-AWD both use the same 245/40R19 radial tire size. There is no primary size split between those two sub-models, so the fitment question is more uniform than it is on many sedan lines.
Shared size does not mean every car is still wearing its original wheel setup, so it is still worth checking the wheel diameter and width directly on the vehicle. Once those basics are confirmed, tire choice becomes a matter of selecting the tread and series that best match your road use.
Choosing the Right Tire
What should I consider when choosing a 245/40R19 tire for a 2018 Acura RLX?
Start with the basics: the 2018 Acura RLX uses a 245/40R19 radial tire on a 19-inch wheel. From there, compare tire series, approved rim-width range, and any stated load specification, while keeping the car’s use in mind whether it spends more time touring, commuting, or seeing more spirited road driving.
A low-profile fitment like this rewards careful setup verification. Wheel width, suspension condition, alignment, and any prior wheel changes can all influence how well a given tire choice suits the car. Staying within the correct size is the foundation, but selecting the right series helps shape the overall driving feel.
What sidewall styles are available for 2018 Acura RLX tires?
The available 245/40R19 tires for the 2018 Acura RLX use a blackwall sidewall style. That keeps the appearance modern and understated, which suits the RLX’s contemporary luxury-sedan character and aligns with the performance-oriented radial options available in this fitment.
Since sidewall appearance does not vary here, the better comparison points are tire series, construction details, and wheel-width compatibility. Buyers looking for a specific visual statement will find the RLX choices more focused on modern blackwall presentation than on whitewall, redline, or other specialty sidewall treatments.
What tire series are available for the 2018 Acura RLX?
The 2018 Acura RLX is available in 245/40R19 through BFGoodrich g-Force series options including g-Force Sport Comp 2, g-Force Comp 2 AS, and g-Force Phenom T/A. Each stays within the same primary fitment while giving the buyer different product-character choices inside the correct size.
Comparing tire series is useful because the RLX does not need a size decision first. Once the 245/40R19 fitment and 19-inch wheel are confirmed, the series comparison becomes the meaningful step, along with checking approved rim width and reviewing any load and pressure details tied to individual products.
Restoration & Appearance
Which tire should I choose for a period-style 2018 Acura RLX?
A period-appropriate approach for a 2018 Acura RLX starts with keeping the original-style fitment format: a 245/40R19 modern radial on a 19-inch wheel. Since the RLX is a contemporary luxury sedan rather than a vintage restoration platform, staying with the correct size and a restrained blackwall presentation preserves the car’s intended visual balance.
The more important appearance question is whether the car still retains its proper wheel setup and overall stance. A tire that matches the correct size profile usually does more for a clean, authentic look than chasing novelty, and it also helps avoid visual or clearance issues from mismatched wheel and tire combinations.
Does correct tire fitment matter for a 2018 Acura RLX restoration or preservation-minded build?
Yes. Even on a relatively recent vehicle like the 2018 Acura RLX, correct tire fitment matters if the goal is to preserve the car’s design balance, wheel-to-body proportions, and intended road manners. Using the proper 245/40R19 size keeps the tire profile aligned with the RLX’s original modern sedan character.
Preservation-minded owners should also pay attention to wheel condition, finish, and whether the car has been altered over time. A correct-size radial on the proper 19-inch wheel helps maintain the right visual relationship at the fender openings, while also reducing the risk of avoidable fitment complications from improvised substitutions.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 Acura RLX?
Yes. The 2018 Acura RLX uses a 245/40R19 tire, but wheel and suspension changes can alter how that size behaves on the car. Aftermarket wheels, different wheel widths, offset changes, lowered suspension, or body modifications can all affect clearance even when the tire size itself matches the original fitment.
That is why the vehicle should be checked as it sits rather than assumed to be stock. Look at wheel diameter, wheel width, inner and outer clearance, and steering travel before choosing a replacement tire, especially on a used RLX where prior owners may have made changes that are not immediately obvious.
What should I inspect before driving a 2018 Acura RLX on new tires?
Before putting a 2018 Acura RLX into regular use on new tires, inspect wheel condition, valve stems, tread direction if applicable, and inflation pressure. It is also smart to confirm that the 245/40R19 tires are mounted on the proper 19-inch wheels and that there is no rubbing at normal ride height or steering angle.
A fresh alignment check can help protect the new tires from uneven wear, especially on a low-profile fitment. Road-test the car carefully at first and pay attention to vibration, pull, or contact noises, since those symptoms can reveal wheel damage, balance issues, or clearance problems that should be corrected promptly.
How often should tires on a 2018 Acura RLX be inspected?
Tires on a 2018 Acura RLX should be inspected regularly, not just when tread looks low. Check them for air loss, uneven wear, cuts, punctures, sidewall damage, and any developing bulges, especially because the 245/40R19 fitment uses a relatively short sidewall that can be more vulnerable to road-impact damage.
Monthly pressure checks are a good routine, and a closer inspection before longer drives is worthwhile. Owners should also watch for signs that alignment or suspension condition is affecting wear, since catching those problems early can help preserve tire life and maintain the composed road manners expected from the RLX.
