2012 Acura Tire Fitment Guide

2012 Acura vehicles use five sizes across three models: 245/45R18 for the RL and some TL applications, 245/50R17 for the TL, 245/40R19 for the TL, 225/50R17 for the TSX, and 235/45R18 for the TSX. Rim diameters therefore span 17, 18, and 19 inches. Where product fitment details are available, 245/45R18 and 235/45R18 suit 7.5- to 9.0-inch rims, 245/40R19 suits 8.0- to 9.5-inch rims, and 225/50R17 suits 6.0- to 8.0-inch rims.

The practical takeaway is that year and make alone are not enough for a 2012 Acura. You need the exact model, and on TL and TSX applications you also need to confirm which wheel package is on the car. Checking the sidewall on the current tires and measuring the wheel diameter before ordering will usually settle the question quickly.

On a 2012 Acura, 245/45R18 is a metric radial size code. The 245 is the nominal section width in millimeters, 45 is the aspect ratio, meaning the sidewall height is 45 percent of the section width, R identifies radial construction, and 18 is the wheel diameter in inches. Within the 2012 Acura range, that size fits the RL and certain TL applications.

That decoding matters because it tells you the tire’s basic proportions as well as the wheel it must mount on. A 245/45R18 cannot be swapped onto a 17-inch or 19-inch wheel, even if another 2012 Acura model uses a similar section width. If your car currently wears 18-inch wheels, this code is one of the first things to verify against the sidewall before choosing a tire.

No. The 2012 Acura lineup uses different tire sizes by model, and in some cases by wheel package within the same model. The RL uses 245/45R18, the TL can use 245/50R17, 245/45R18, or 245/40R19, and the TSX can use 225/50R17 or 235/45R18. Only the 245/45R18 size is shared, and that overlap is limited to the RL and one TL fitment.

That means a 2012 Acura owner should identify the car as an RL, TL, or TSX before doing anything else. The next step is confirming the wheel diameter already on the car, since that often narrows the correct fitment immediately. This is especially important for the TL, which spans three different wheel-and-tire combinations.

The available 2012 Acura sizes in this range use blackwall sidewall styling. That is true for 245/45R18, 245/40R19, 225/50R17, and 235/45R18. Since the 2012 Acura lineup belongs to the modern sport-luxury era rather than a classic wide-whitewall era, blackwall presentation matches the car’s original design language and market position.

For most RL, TL, and TSX owners, the sidewall decision is straightforward because appearance does not split into multiple period styles here. The more meaningful differences come from size, wheel diameter, brand, and speed rating. Once those are confirmed, sidewall appearance is already aligned with the kind of modern factory look these cars typically carry.

BFGoodrich and Nitto cover the available 2012 Acura fitments here. The shared 245/45R18 size is available from both BFGoodrich and Nitto, the 225/50R17 TSX size is also available from BFGoodrich and Nitto, the 235/45R18 TSX size is covered by BFGoodrich, and the 245/40R19 TL size is covered by BFGoodrich.

That brand spread matters most when your Acura uses one of the sizes with more than one manufacturer, because it gives you a broader choice of series and load or speed specifications within the same basic fitment. If your car uses a more specialized size such as 245/40R19, confirm the exact size first and then compare the available series within that brand family.

For 2012 Acura RL and TL applications using 245/45R18, BFGoodrich covers the size in several g-Force series choices plus a g-Force Phenom T/A, while Nitto offers the NT555 G2. Rim width coverage is closely aligned at roughly 7.5 to 9.0 inches across the size, but the load and speed details are not identical. Nitto’s NT555 G2 carries a 100W specification with a 1,764-pound maximum load at 50 psi, while BFGoodrich options in this size include 96W and 100Y variants.

That means the best comparison point is not brand name alone, but the exact service description and how it fits your car’s use. If you are replacing a matched set, check the size, speed symbol, and load marking on the existing tires so the new set stays consistent. On shared RL and TL fitments, that extra check helps avoid mixing similar-looking 18-inch tires with different ratings.

Rim width requirements vary by tire size on 2012 Acura vehicles. The 225/50R17 size fits 6.0- to 8.0-inch rims, 245/45R18 fits 7.5- to 9.0-inch rims, 235/45R18 also fits 7.5- to 9.0-inch rims, and 245/40R19 fits 8.0- to 9.5-inch rims. Those ranges are specific to the tire size and should be checked against the wheel that is actually on the car.

Rim width matters because two wheels can share the same diameter but still differ enough in width to affect how the tire seats and wears. If your Acura has aftermarket wheels, verify both diameter and width before choosing tires. Staying within the published range for the exact size helps preserve intended tread shape and handling behavior.

The available 2012 Acura products shown here are modern radial tires with tubeless-style size markings rather than tube-type markings. None of these fitments carries a TT designation, and the size markings use the modern metric radial format common to tubeless passenger-car tires. That aligns with the 2012 Acura lineup’s original-era use of modern one-piece passenger wheels.

Even so, it is smart to verify the actual wheel condition before mounting new tires, especially if the car has had wheel repairs or aftermarket replacements. A damaged bead seat or a leaking valve stem can create problems that have nothing to do with the tire itself. If you are uncertain about the wheel, have it inspected during mounting.

A 2012 Acura should be stored in a cool, dry space away from direct sunlight, electric motors, welders, furnaces, and other ozone-producing equipment that can age rubber. Keep the tires properly inflated, and if the car will sit for extended periods, move it occasionally so the same section of tread is not carrying the load month after month. Clean, dry concrete is fine, but avoid prolonged contact with oil, solvents, or standing moisture.

Modern radial tires generally tolerate static storage better than older bias-ply tires, but they still age from environment and time. If the car is a low-mileage weekend or seasonal vehicle, storage habits can matter more than tread wear. A breathable car cover, steady inflation pressure, and occasional movement go a long way toward preserving ride quality and sidewall condition.

For a 2012 Acura, tire age is usually a more important guide than mileage alone, especially on enthusiast or low-use cars. A good rule is to begin evaluating tires closely around the five- to seven-year mark and to consider replacement as they approach ten years from the DOT date code, even if tread depth still looks acceptable. Heat cycles, storage conditions, and inflation history all affect that timeline.

Many RL, TL, and TSX cars are now old enough that date code checks should be part of any pre-purchase or maintenance routine. A tire can look sound at a glance but still be aging internally. If your Acura sees highway use, seasonal storage, or long idle periods, age-based replacement planning is especially worthwhile.

Tires on a 2012 Acura deserve a quick inspection before every drive and a more careful inspection before any longer outing. Look for sidewall cracking, tread damage, nails or cuts, uneven wear, bulges, and any sign that the tire has been run underinflated. Pressure should be checked regularly with the tires cold, not just by eye.

That routine is especially useful on cars that are driven intermittently, because a tire can lose pressure while sitting and may not show it until the car is moving. If your Acura has been parked for a while, inspect the spare as well as the road tires. Catching a slow leak or aging valve stem before a trip is far easier than dealing with it on the shoulder.

Yes, the available 2012 Acura fitments here are modern radial tires with high-speed service descriptions appropriate to contemporary passenger-car use. The sizes shown carry W and Y speed ratings depending on the exact product, with W rated to 168 mph and Y rated to 186 mph. Those numbers are well beyond ordinary legal highway speeds, assuming the tires are correctly mounted, inflated, and in sound condition.

Real-world highway safety still depends on the whole car, not the speed symbol alone. Alignment, suspension wear, brake condition, and tire age all matter on an older RL, TL, or TSX. For most drivers, choosing the correct size and maintaining it properly will have a greater effect on safe road manners than chasing the highest speed rating available.

Inflation pressure on a 2012 Acura should follow the vehicle placard or owner’s manual for normal service, while also respecting the tire maker’s maximum load and pressure figures for the exact tire. Where load-and-pressure figures appear in these sizes, examples include 1,477 pounds at 51 psi for some 225/50R17 tires, 1,653 pounds at 50 psi for some 235/45R18 and 245/40R19 tires, and 1,764 pounds at 50 psi for some 245/45R18 tires. Those are maximum-rated figures, not blanket recommendations for everyday use.

The important point is not to transfer a pressure figure from one size to another or from one tire series to another. A TL on 19-inch tires may need a different setting than a TSX on 17-inch tires, even before product differences are considered. Start with Acura’s vehicle recommendation, then confirm the exact tire’s markings during installation.

Before a longer drive in a 2012 Acura, inspect each tire for cuts, punctures, bulges, sidewall cracking, abnormal wear, and proper cold inflation pressure. Check that the tires match in size and service type across each axle, and make sure the spare is usable if the car still carries one. A quick look at the valve stems and tread depth is part of the same routine.

Tires are only one part of preparing an older modern Acura for distance, but they are one of the easiest things to verify before you leave. If the car has been sitting, take a short local drive first to feel for vibration, pull, or noise before committing to highway miles. That short shakedown often reveals issues while you are still close to home.