2009 Acura Tire Fitment Guide

2009 Acura vehicles use four tire sizes across three models. The RL uses 245/45R18, the TSX uses 225/50R17, and the TL appears with 245/50R17, 245/45R18, or 245/40R19 depending on wheel package. Rim diameters therefore span 17, 18, and 19 inches across the lineup. Where product fitment details are available, 225/50R17 fits 6.0 to 8.0-inch rims, 245/45R18 fits 7.5 to 9.0-inch rims, and 245/40R19 fits 8.0 to 9.5-inch rims.

That means year and make alone are not enough for a confident tire choice on a 2009 Acura. The safest starting point is the exact model and the actual wheel diameter currently on the car, especially for the TL because it spans three different fitments. If the car has changed hands or has aftermarket wheels, verify the size molded into the current tire sidewall and compare it to the wheel itself before moving ahead.

On a 2009 Acura, 245/45R18 is a metric radial size. 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. This size appears on the 2009 Acura RL and on certain 2009 Acura TL applications.

Reading the code correctly helps you avoid confusing one TL fitment with another, since 17-inch, 18-inch, and 19-inch packages all exist in the same model year. It also gives context when comparing products, because tires with the same code should share the same core dimensional standard even when tread design, speed rating, load index, and intended use differ between brands or series.

No, 2009 Acura models do not all use the same tire size. The RL uses 245/45R18, the TSX uses 225/50R17, and the TL is the outlier with three possible fitments: 245/50R17, 245/45R18, or 245/40R19. Even where two models share a size, such as the RL and some TL applications on 245/45R18, that does not make the whole Acura range uniform.

The practical takeaway is simple: identify the model first, then confirm the wheel diameter on the car. That step matters most on the TL, where trim, wheel package, or a previous owner's wheel change can put the car into a different size family entirely. Once the exact fitment is settled, comparing brands and tire series becomes much easier and much more accurate.

The available 2009 Acura fitments here are consistently Blackwall radials across the covered sizes. That applies to 245/45R18, 245/40R19, and 225/50R17 products, all of which keep the clean, modern sidewall appearance expected on late-2000s Acura sedans. No wide whitewall or vintage-style sidewall treatment appears within these Acura fitments.

That makes the visual decision simpler than it would be on an older collector car, where sidewall styling can be a major authenticity issue. For a 2009 Acura, the more meaningful comparison is usually between tire series, speed rating, and load index within the correct size. Once the fitment is confirmed, sidewall appearance is largely settled by the period-correct Blackwall look.

BFGoodrich and Nitto cover the available 2009 Acura fitments shown here. The 245/45R18 size is available from BFGoodrich and Nitto, the 245/40R19 size is available from BFGoodrich, and the 225/50R17 size is available from BFGoodrich and Nitto. All of those offerings are radial Blackwall tires aimed at modern road use rather than vintage-style reproduction applications.

Brand choice matters most after you have settled the correct size for the car. A TL owner on 19-inch wheels will be choosing within a narrower brand range than an RL owner on 18-inch wheels, while a TSX owner has both BFGoodrich and Nitto options in 225/50R17. Comparing speed rating, load index, and rim-width compatibility inside the correct size is usually more useful than choosing by brand name alone.

For 2009 Acura fitments where both appear, BFGoodrich g-Force Sport Comp 2 and BFGoodrich g-Force Phenom T/A share the same basic size but differ in some published service details. In 245/45R18, the Sport Comp 2 carries a 96W marking and a 1,565-pound maximum load at 51 psi, while the Phenom T/A carries a 100Y marking and a 1,764-pound maximum load at 50 psi. In 245/40R19, the Sport Comp 2 is marked 98W XL and the Phenom T/A is marked 98Y, with both carrying a 1,653-pound maximum load at 50 psi.

Those differences matter if you are comparing highway speed category, load index, and how closely a tire's service description matches your intended use. They do not change the fact that both must be matched to the correct Acura fitment first. Once size is confirmed, look closely at the full sidewall marking and the wheel-width range so the tire suits both the car and the wheel it will actually be mounted on.

Rim-width guidance varies by tire size on 2009 Acura applications. The 225/50R17 size fits 6.0 to 8.0-inch rims, the 245/45R18 size fits 7.5 to 9.0-inch rims, and the 245/40R19 size fits 8.0 to 9.5-inch rims. Those ranges are broad enough to cover factory-style wheel widths while still showing that each size has its own proper wheel window.

Matching the tire to the wheel width is just as important as matching the tire to the car. A tire mounted on a wheel that is too narrow or too wide can alter sidewall shape and how the car responds on the road. Before final selection, confirm the wheel's actual width and compare it to the range for the exact tire size you plan to use.

The covered 2009 Acura tire offerings are modern radial fitments without tube-type markings in the size descriptions, so they are treated as tubeless applications. That is consistent with late-model passenger car wheel and tire practice, especially on 17-inch, 18-inch, and 19-inch Acura sedans from this period. None of these Acura fitments are presented as classic tube-type bias-ply tires.

Even so, tubeless service still depends on the condition of the wheel and valve stem. A bent rim, corrosion at the bead seat, or an aging valve stem can create air-loss problems that look like a tire issue at first glance. If the wheels are original to the car, it is wise to inspect the sealing surfaces before mounting new tires.

A 2009 Acura should be stored on clean, properly inflated tires in a cool, dry, dark environment away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment. Moisture and long-term exposure to heat accelerate sidewall aging even when the car is driven only occasionally. Because these Acura fitments are all radial, they generally tolerate storage better than older bias-ply designs, but static weight on one spot for months at a time is still not ideal.

Moving the car periodically or supporting it in a way that reduces prolonged load on the tires can help minimize flat-spotting during long storage. Keep the tires off oily or solvent-contaminated floors, and check pressure before the car goes back on the road. Collector-style storage habits matter even on a modern Acura if the car is used seasonally or preserved as a future classic.

Tires on a 2009 Acura should be judged more by age and condition than by mileage alone, especially on cars that see limited use. A sound rule is to begin regular age-based evaluation around the five- to seven-year mark and to treat around ten years as the point where replacement deserves serious consideration regardless of remaining tread. The DOT date code on the sidewall is the best quick reference for the tire's actual age.

That approach matters because a low-mileage tire can still harden, crack, or lose wet-weather confidence as the rubber ages. A sedan like the RL, TL, or TSX may look perfectly serviceable while the tire compound has already moved well past its best years. If the car is driven only on weekends, calendar age should carry more weight than odometer use when planning replacement.

Tires on a 2009 Acura should be inspected before every drive and more thoroughly before any longer highway trip. Look for sidewall cracking, cuts, bulges, uneven tread wear, punctures, and any sign that the tire has been run underinflated. It is also worth confirming that all four tires are holding pressure evenly, since a slow leak can change how an Acura sedan feels long before the tire appears visibly low.

Regular inspections help catch alignment or suspension issues as well as tire wear. If one shoulder is wearing faster than the other, or if the steering feel changes, the problem may not be the tire itself. Early attention protects the tire investment and keeps a 2009 Acura's balance and road manners closer to what the chassis was designed to deliver.

Yes, the radial tire options used on 2009 Acura applications are suitable for highway driving when they are the correct size, in good condition, and inflated appropriately. The covered products carry W and Y speed ratings depending on size and series. W corresponds to 168 mph, and Y corresponds to 186 mph or higher, which are well beyond normal U.S. highway speeds.

Real-world safety depends on more than the speed letter on the sidewall. Tire age, inflation pressure, alignment, suspension condition, and brake health matter just as much on a sport-oriented sedan like an RL, TL, or TSX. For most drivers, the practical concern is not the tire's maximum speed category but whether the tire is fresh, properly matched to the wheel, and mechanically supported by a sound car.

Inflation pressure on a 2009 Acura should follow the vehicle's factory recommendation for normal service, with the tire's own maximum-pressure marking understood as part of its load capacity, not as a universal everyday setting. Among the covered products, 245/45R18 examples show maximum load and pressure figures up to 1,764 pounds at 50 psi or 1,565 pounds at 51 psi, 245/40R19 examples reach 1,653 pounds at 50 psi, and 225/50R17 examples reach 1,653 pounds at 50 psi or 1,477 pounds at 51 psi.

Those figures should not be transferred from one size to another or used as a blanket recommendation for all 2009 Acura models. The best practice is to start with the Acura placard or owner's manual for factory pressure guidance, then confirm that the chosen tire's service description is appropriate for the car. Pressure should always be checked cold, not after the car has been driven.

Before a longer drive in a 2009 Acura, inspect each tire for cracking, cuts, punctures, bulges, and uneven wear, then confirm cold inflation pressure on all four corners. Check the spare as well, especially on cars that have not needed it in years. A TL with 19-inch fitment or an RL on 18s can feel fine in town while still hiding an age-related issue that becomes obvious only after sustained highway heat builds up.

Tires are only one part of the pre-trip routine on a vehicle of this age. It is smart to pair the tire inspection with a quick look at brakes, fluid levels, suspension condition, and wheel fastener torque. That broader check helps ensure the car is ready for the trip and reduces the chance that a small problem in the garage becomes a roadside interruption.