2021 Acura Tire Fitment Guide

2021 Acura vehicles use seven tire sizes across three models. The ILX uses 215/45R17 or 225/40R18, the NSX uses 245/35R19 and 305/30R20, and the TLX uses 235/50R18, 255/40R19, or 255/35R20. These sizes are all radial and mount on 17-, 18-, 19-, or 20-inch wheels depending on model and application. Rim width guidance appears within individual sizes, including 7.0-8.0 inches for 215/45R17, 7.5-9.0 inches for 225/40R18, 8.0-9.5 inches for 245/35R19, 8.5-10.0 inches for 255/40R19, 6.5-8.5 inches for 235/50R18, and 8.5-10.0 inches for 255/35R20.

That means a 2021 Acura owner should not start with brand alone. Start by identifying the model, then confirm the wheel diameter already on the car, and on an NSX confirm whether you are shopping for the front or the rear axle. Once those basics are locked in, you can compare sidewall style, speed rating, and brand options within the correct size instead of sorting through tires that fit a different Acura entirely.

On a 2021 Acura, 215/45R17 is a modern metric radial size. The 215 is the nominal section width in millimeters, 45 is the aspect ratio, meaning the sidewall height is 45 percent of the section width, R indicates radial construction, and 17 is the wheel diameter in inches. For 2021 Acura fitment, that size belongs to the ILX and is paired with 17-inch wheels, with radial options from BFGoodrich in Blackwall form.

Understanding that code matters because it separates wheel diameter from tire proportions. A 215/45R17 and a 225/40R18 are both ILX sizes, but they do not interchange unless the wheel diameter changes with them. If your ILX currently wears 17-inch wheels, focus on the 215/45R17 family and then compare the available W-rated product choices, rim width range, and any load details that matter for how you use the car.

No. 2021 Acura models do not share one common tire size across the lineup. The ILX uses 215/45R17 or 225/40R18, the NSX uses a staggered 245/35R19 front and 305/30R20 rear combination, and the TLX uses 235/50R18, 255/40R19, or 255/35R20 depending on configuration. Every size is model-specific, and the wheel diameters span from 17 to 20 inches.

That makes model identification more than a formality. An ILX owner comparing 18-inch choices is in a completely different part of the fitment spectrum from an NSX owner sourcing rear 20-inch rubber or a TLX owner confirming whether the car uses 18s, 19s, or 20s. If you are unsure, verify the placard, the existing sidewall, and the wheel diameter before choosing among products.

Most 2021 Acura tire sizes are available as Blackwall radials, which matches the modern appearance expected on late-model Acura sedans and performance cars. The exception is 305/30R20 for the NSX rear application, where Blackwall, RWL, and Redline sidewall styles are available. That gives the NSX rear size the widest appearance range of any 2021 Acura fitment on this page.

For buyers who want a contemporary factory-like look, Blackwall is the straightforward choice across the Acura lineup. RWL and Redline treatments introduce a more customized visual effect and make the strongest styling statement on the NSX's wide rear tire. If appearance matters as much as fitment, choose the size first, then decide whether you want a subtle modern look or a more attention-grabbing sidewall treatment.

2021 Acura fitments are covered by BFGoodrich, Nitto, and Pro-Trac depending on size. BFGoodrich appears across every Acura size on this page except the two Pro-Trac 305/30R20 options, while Nitto covers several 18-, 19-, and 20-inch applications. Pro-Trac appears in the NSX rear 305/30R20 size with RWL and Redline sidewall treatments in addition to Nitto's Blackwall version.

Brand choice is easiest once the exact size is settled. ILX owners choosing 215/45R17 stay within BFGoodrich, while 225/40R18 opens the door to BFGoodrich and Nitto. The NSX front 245/35R19 and TLX 18- and 20-inch fitments also mix BFGoodrich and Nitto, and the NSX rear 305/30R20 adds Pro-Trac for buyers who want a different sidewall appearance.

For several 2021 Acura sizes, BFGoodrich offers both g-Force Sport COMP-2 and g-Force Phenom T/A choices in the same general category of radial performance tire. In 215/45R17, both weigh about 23 pounds, while the Phenom T/A carries a 1,356-pound load figure at 50 psi. In 255/40R19, the Sport COMP-2 carries a W speed rating and a 1,764-pound load figure at 50 psi, while the Phenom T/A carries a Y speed rating and the same 1,764-pound load figure at 50 psi.

That means the difference is not just the name on the sidewall. Depending on size, there can be meaningful differences in speed rating, weight, and stated load information even when the two tires fit the same wheel diameter and similar rim width range. If you are comparing those two BFGoodrich lines for a 2021 Acura, review the exact size first and then compare the sidewall marking and rated specs for that specific application.

Rim width requirements for 2021 Acura tires vary by size. The 215/45R17 fits 7.0 to 8.0-inch rims, 225/40R18 fits 7.5 to 9.0-inch rims, 245/35R19 fits 8.0 to 9.5-inch rims, 255/40R19 fits 8.5 to 10.0-inch rims, 235/50R18 fits 6.5 to 8.5-inch rims, and 255/35R20 fits 8.5 to 10.0-inch rims. Those ranges are wide enough to cover multiple wheel packages, but they are not interchangeable across all Acura sizes.

The practical takeaway is that wheel diameter alone is not the whole story. Two 18-inch Acura tires can call for different rim widths, and low-profile 19- and 20-inch sizes typically expect wider wheels than the 17-inch ILX size. Before mounting any replacement tire, confirm the actual wheel width stamped on the rim or verify it through the wheel manufacturer so the tire and wheel work together as intended.

The 2021 Acura tire sizes on this page are modern radial fitments, and tubeless markings appear within the product details for at least some sizes. One 255/40R19 option is marked TL, which indicates tubeless construction, while most other products use standard modern radial sizing without a tube-type marking. Nothing here points toward a tube-type collector-era application.

For a late-model Acura, the normal expectation is a tubeless tire on a compatible tubeless wheel, but the sidewall marking on the exact tire is still the final word. Check the tire description and the wheel condition before installation, especially if the car uses aftermarket wheels. If you are replacing only one or two tires, make sure the new tire matches the wheel's intended tubeless setup and valve stem condition.

A 2021 Acura stores best on clean, properly inflated tires kept away from direct sunlight, electric motors, welders, furnaces, and other ozone-producing equipment. Cool, dry conditions help preserve rubber, and it is smart to move the car periodically so one section of tread does not carry the load for months at a time. Modern radials generally tolerate storage better than older bias-ply tires, but they still age when parked.

If the car will sit for a season, wash the tires, set inflation to the vehicle maker's storage guidance or normal operating range, and avoid parking on wet soil or bare concrete if possible. Enthusiasts storing a car for an extended period often roll it occasionally or use stands to reduce static load. A few minutes of preventive care during storage can save you from vibration, cracking, or uneven wear later.

Tire life on a 2021 Acura is best judged by age, condition, and storage history rather than mileage alone. A useful collector and enthusiast rule is to begin evaluating tires closely around the five- to seven-year mark and to treat about ten years as a serious replacement consideration regardless of tread depth. The DOT date code on the sidewall is the easiest way to confirm age.

That matters because many enthusiast-driven Acuras cover limited annual miles, especially performance models or second cars. A tire can look healthy from across the garage and still be aging internally or developing sidewall cracking. Check the date code, inspect the tread and shoulders, and replace on condition and age rather than waiting for the tread to wear out the way a daily commuter tire might.

Tires on a 2021 Acura should be inspected before every drive and given a closer check before any longer outing. Look for pressure loss, punctures, outer-shoulder wear, sidewall cuts, bulges, and cracking, especially on low-profile 19- and 20-inch fitments where curb damage can be easy to miss. A quick visual check takes very little time and often catches problems early.

Longer trips deserve a more deliberate inspection. Check cold pressure, confirm even wear across the tread, and look at the spare if the vehicle carries one. On staggered applications such as the NSX, inspect front and rear tires separately because each axle uses a different size and may wear differently. Regular inspection is one of the simplest ways to protect both the tires and the wheels they mount on.

Yes, the 2021 Acura tires here are modern radial performance sizes suited to normal highway use when they are in good condition, properly inflated, and matched to the correct wheel. Speed ratings in these Acura sizes include W, with a 168 mph ceiling, and Y, with a 186+ mph ceiling depending on the exact product. Those ratings are well beyond ordinary interstate speeds.

The more important safety question is usually condition and correct application, not theoretical top speed. A properly sized, healthy radial tire on the right wheel is far more important than chasing the highest letter on the sidewall for normal road use. Make sure the tire matches the Acura model and wheel diameter, and remember that alignment, suspension condition, and braking performance also shape how secure the car feels at speed.

Inflation pressure for a 2021 Acura should follow the vehicle maker's placard or owner's manual for normal service, because factory pressure targets are set around the car's weight distribution and intended handling balance. Tire load-and-pressure figures vary by size and product: 215/45R17 reaches 1,356 pounds at 50 psi in one application, 225/40R18 reaches 1,389 pounds at 50 psi, 245/35R19 reaches 1,433 pounds at 50 psi, 255/40R19 reaches 1,764 pounds at 50 psi, 235/50R18 reaches 1,819 pounds at 50 psi, and 255/35R20 reaches 1,609 pounds at 50 psi.

Those figures are tire capacity references, not a universal instruction to run every Acura at 50 psi. The correct day-to-day setting is the vehicle recommendation unless a tire maker gives a different approved application-specific guideline. Do not transfer a pressure figure from one Acura size to another, and do not assume an NSX rear tire, a TLX 18-inch tire, and an ILX 17-inch tire should be inflated the same way.

Before a longer drive in a 2021 Acura, inspect each tire for cuts, punctures, bulges, sidewall cracking, and uneven wear, then verify cold inflation pressure and confirm the wheels are free of obvious damage. On an NSX, check the front and rear sizes separately because the car uses a staggered setup. It is also wise to inspect the spare if one is present and make sure valve stems are in good condition.

Tires are only one part of a sensible pre-trip routine, but they are one of the easiest parts to inspect at home. If the car has been sitting, pay extra attention to age, flat-spot feel during the first miles, and any vibration that was not there before. A short walk-around before departure can catch the kind of issue that turns a pleasant road trip into a shoulder stop.