2021 Infiniti Tire Fitment Guide

2021 Infiniti vehicles use seven sizes across two models. The Q50 uses 225/55R17, 225/50R18, 245/40R19, and 265/35R19, while the Q60 uses 255/40R19, 255/35R20, and 275/30R20. Rim diameters span 17, 18, 19, and 20 inches, and rim width guidance appears on several products: 225/55R17 fits 6.0 to 9.0 inches depending on the tire, 225/50R18 fits 6.0 to 8.0, 245/40R19 fits 8.0 to 9.5, 265/35R19 fits 9.0 to 10.5 where stated, 255/40R19 fits 8.5 to 10.0, and 255/35R20 fits 8.5 to 10.0.

The practical takeaway is that year and make alone are not enough for 2021 Infiniti fitment. You need the model first, then the wheel diameter already on the car, and then the exact tire size. That matters most on the Q50, which appears with multiple wheel packages, and on the Q60, where 19-inch and 20-inch fitments are not interchangeable. If your car has aftermarket wheels, verify both the current tire size and the wheel width before choosing a replacement.

On a 2021 Infiniti, 225/55R17 is a metric radial size. The 225 is the section width in millimeters, 55 is the aspect ratio, meaning the sidewall height is 55 percent of the section width, R means radial construction, and 17 is the wheel diameter in inches. In this year-and-make range, that size belongs to the Q50 and appears in both Blackwall and Wide Whitewall versions, depending on the product selected.

That decoding helps you avoid two common mistakes: confusing wheel diameter with tread width, and assuming any 225-size tire with a different profile will fit the same way. A 225/55R17 must go on a 17-inch wheel, and its overall proportions differ from the Q50’s 18-inch and 19-inch sizes. If your goal is to keep the factory-style wheel diameter and preserve speedometer, stance, and clearance relationships, staying with the exact 225/55R17 size is the smart starting point.

No, 2021 Infiniti models do not use the same tire size across the range. The Q50 sedan uses four sizes from 17 to 19 inches, while the Q60 coupe uses three sizes from 19 to 20 inches. Even where both models appear in the 19-inch category, the actual sizes differ, with the Q50 using 245/40R19 and 265/35R19 and the Q60 using 255/40R19.

That means a buyer should identify the model before looking at brands or tread styles. It also means visual cues alone can mislead you, especially if the car has staggered fitments or optional wheel packages. Checking the sidewall on the tire already mounted to the car, along with the model name and wheel diameter, will usually narrow the choice immediately. Once those three points match, the product selection becomes much easier and far more accurate.

Most 2021 Infiniti sizes here are offered in Blackwall form, which is the standard modern appearance for both the Q50 and Q60. The one exception is 225/55R17 for the Q50, where a BFGoodrich Silvertown Radial is also available with a 1.50-inch Wide Whitewall. That gives the Q50 a small custom-style appearance option that does not appear in the other 2021 Infiniti sizes.

For a stock-appearing modern Infiniti, Blackwall is the natural visual choice. The whitewall option is more of a styling statement than an authenticity play, and it will change the car’s character significantly compared with the factory-era look most buyers expect from a 2021 premium sport sedan. If appearance matters as much as fitment, compare sidewall style first and tread category second, since the same basic size can produce a very different visual result.

2021 Infiniti tires in these sizes come from BFGoodrich and Nitto. BFGoodrich covers every size shown here, while Nitto appears in 265/35R19, 255/35R20, and 275/30R20. Within BFGoodrich, the available series include g-Force Comp 2 AS, g-Force Sport Comp 2, g-Force Phenom T/A, and Silvertown Radial in the one whitewall 17-inch Q50 application.

Brand choice matters most when you are comparing how much variety exists within your exact size. Some sizes, such as 225/50R18 and 245/40R19, are entirely BFGoodrich territory, while 265/35R19 and 255/35R20 open the door to either BFGoodrich or Nitto. If you already know the wheel size on your Q50 or Q60, start by confirming the exact tire size and then compare the available series inside that size rather than trying to shop the year-and-make range as one group.

On several 2021 Infiniti sizes, both BFGoodrich g-Force Sport Comp-2 and BFGoodrich g-Force Phenom T/A are available, but their details are not identical. In 245/40R19, the Sport Comp-2 carries a 98W rating while the Phenom T/A carries a 98Y rating; in 265/35R19, the Sport Comp-2 is 98W XL while the Phenom T/A is 98Y; in 255/40R19, the Sport Comp-2 is 100W XL and the Phenom T/A is 100Y. Rim-width guidance is also spelled out on the Phenom T/A products for these sizes.

For a buyer, that means these two series should not be treated as interchangeable by name alone. The speed category changes in several sizes, and the product details can differ in load information and wheel-width guidance as well. If you are comparing them for a Q50 or Q60, look at the exact size first, then compare the speed marking and any published load figure on that specific tire. That approach keeps the comparison grounded in the tire you will actually mount.

Rim width requirements on 2021 Infiniti tires vary by size. 225/50R18 uses 6.0 to 8.0 inches, 225/55R17 uses 6.0 to 8.0 on most products and up to 9.0 inches on the Silvertown Radial, 245/40R19 uses 8.0 to 9.5, 265/35R19 uses 9.0 to 10.5 where stated, 255/40R19 uses 8.5 to 10.0, and 255/35R20 uses 8.5 to 10.0. No rim-width figure is attached here to the single 275/30R20 Nitto entry.

Those ranges matter because the same tire size can behave differently when mounted near the narrow or wide end of its approved wheel width. They also explain why matching only the diameter is not enough. If your Q50 or Q60 still has its original wheels, you are usually checking for confirmation; if it has aftermarket wheels, measure the wheel width before making a selection. That one step prevents avoidable fitment issues and keeps the tire working as intended.

2021 Infiniti tires in these sizes are modern radial fitments and the product markings point to tubeless construction rather than tube-type service. One 255/40R19 product explicitly includes a TL marking, and the rest follow the same modern passenger radial pattern without tube-type markings. Nothing in this size range suggests a tube-type application like those found on much earlier collector vehicles.

For most Q50 and Q60 owners, that means the important setup items are wheel condition, bead seating, and valve-stem condition rather than sourcing tubes. If you are using original late-model wheels in good shape, tubeless radial service is the normal expectation. The one thing worth confirming before installation is the exact sidewall marking on the specific tire you choose, especially if your car has custom wheels or has been modified from its original wheel-and-tire package.

A stored 2021 Infiniti should sit in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing equipment that can age rubber prematurely. Keep the tires clean, inflate them properly, and move the car periodically so the same footprint is not loaded in one place for months at a time. Because every size here is radial, long static storage is generally less prone to the pronounced flat-spotting associated with older bias-ply tires, but stationary weight still affects the casing over time.

If the car will be parked for an extended season, rolling it occasionally or supporting it appropriately can help preserve tire shape and appearance. Pay special attention to low-profile Q60 sizes, since short sidewalls give you less visual cushion against underinflation. A simple storage routine does more for tire life than many owners realize, especially on enthusiast cars that may go weeks between drives.

On a 2021 Infiniti, tire age is usually more important than mileage once the car becomes a lower-use enthusiast or secondary vehicle. A sensible rule is to begin evaluating tires closely around five to seven years of age and to treat about ten years as a serious replacement threshold regardless of remaining tread. The DOT date code on the sidewall is the best way to confirm age, since wear alone does not tell the whole story.

That matters especially on performance-oriented Q50 and Q60 fitments, where a tire can look acceptable at a glance but still harden with age. Heat cycles, storage conditions, and exposure to sun all affect longevity. If the car sees occasional weekend use, do not assume low mileage equals safe service life. A careful age check, combined with an inspection for cracking and pressure loss, is the right basis for replacement timing.

Tires on a 2021 Infiniti deserve a quick inspection before every drive and a more thorough one before any longer trip. Look for sidewall cracking, cuts, bulges, punctures, irregular tread wear, and signs that one tire is losing pressure faster than the others. Because these are all low-profile modern radial sizes, even modest underinflation can affect handling feel, ride quality, and shoulder wear sooner than many drivers expect.

Monthly pressure checks are a good baseline, but enthusiast ownership usually calls for more frequent attention than that. If the car has sat for several weeks, inspect the contact patch and recheck inflation before heading out. On a Q50 or Q60 with staggered or performance-oriented fitments, catching wear early is especially useful because front and rear sizes may not be interchangeable. Small problems are much easier to solve before they become vibration, noise, or roadside trouble.

The 2021 Infiniti sizes here are modern radial tires with W and Y speed categories depending on the specific product. W-rated tires are rated up to 168 mph, while Y-rated tires are rated for 186+ mph. Those figures are far above normal U.S. highway speeds, so in real-world driving the more important question is whether the tire is the correct size, properly inflated, and in sound condition for the wheel and vehicle.

For a Q50 or Q60 used as intended on public roads, a correct, healthy tire in the proper size is the key safety factor. Tire age, impact damage, prior repairs, and chronic underinflation matter far more than chasing a higher speed letter that you will never approach. Match the exact size to the car, keep pressures where they belong, and inspect the tires regularly before assuming any high-performance fitment is ready for sustained highway use.

Inflation pressure for 2021 Infiniti tires should start with the vehicle’s factory placard or owner’s manual, because that is the pressure target chosen for the vehicle’s weight balance and handling. Some tires here also carry load-and-pressure figures as maximum ratings, not everyday operating instructions: 225/50R18 reaches 1,709 pounds at 50 psi on one product, 225/55R17 reaches 1,819 pounds at 50 psi on one product, 245/40R19 reaches 1,653 pounds at 50 psi, 265/35R19 reaches 1,653 pounds at 50 psi, 255/40R19 reaches 1,764 pounds at 50 psi, and 255/35R20 reaches 1,609 pounds at 50 psi on certain versions.

The important distinction is that sidewall maximum pressure is not the same thing as recommended vehicle pressure. Do not transfer a pressure figure from one size to another, and do not assume a higher maximum means the tire should be run harder in normal driving. Use the carmaker’s specification for everyday service, then compare that against the tire maker’s sidewall rating only as a ceiling. If your Q50 or Q60 has non-original wheels or an altered setup, confirm the target pressure more carefully.

Before a longer drive in a 2021 Infiniti, inspect each tire for visible cracking, cuts, punctures, bulges, uneven wear, and any sign of prior curb or pothole damage. Confirm cold inflation pressure, check the valve stems, and make sure the spare or emergency tire solution is present and usable if your car retains one. On low-profile Q50 and Q60 fitments, wheel damage is also worth a close look because sidewalls do not hide bent-rim issues very well.

Tires are only one part of the trip-prep picture, but they are one of the fastest checks you can do before leaving home. A brief walkaround can reveal problems that become much more serious at highway speed or far from home. If the tires are several years old, have been sitting for long periods, or show feathered wear, address that before the drive rather than after. The goal is confidence in the whole package, not just tread depth.