Infiniti Q70L Tires

Infiniti Q70L uses two tire sizes across the 2015 through 2019 model years: 245/50R18 on 18-inch wheels and 245/40R20 on 20-inch wheels. Both are metric radial sizes, and both appear across the full production span rather than being tied to an early-versus-late year break.

That means the correct tire for an Infiniti Q70L is determined by the wheel package on the individual car, not simply by the model year on the title. Check the existing tire sidewall, measure the wheel if needed, and keep the rim diameter matched exactly when replacing the tires.

On an Infiniti Q70L, 245/40R20 is a modern metric radial size code. The 245 is the section width in millimeters, 40 is the aspect ratio, R identifies radial construction, and 20 is the wheel diameter in inches.

That shorter 40-series sidewall is typically associated with the larger 20-inch wheel package, so appearance and ride character will differ from the taller 245/50R18 setup. Keep the full code matched to the wheel on the car rather than choosing by width alone, because the 18-inch and 20-inch fitments are not interchangeable.

A 2017 Infiniti Q70L has two tire sizes listed because the model year includes two wheel-package fitments: 245/50R18 and 245/40R20. The split is a rim-diameter split, not a change from radial to bias-ply and not a separate early-versus-late production change.

The same logic applies across 2015, 2016, 2018, and 2019 as well. If your Infiniti Q70L shows multiple sizes for the same year, identify the actual wheel diameter on the car first, then match the tire size to that wheel rather than trying to choose by year alone.

Infiniti Q70L uses either an 18-inch or 20-inch rim diameter. The 245/50R18 size fits 18-inch wheels, while the 245/40R20 size fits 20-inch wheels, and both diameters appear throughout the 2015 to 2019 production span.

Because there is no single year where the model changed from one diameter to the other, the safest approach is to verify the wheel already on the car. Reading the current sidewall or confirming the wheel marking will settle the question quickly and prevent ordering the right width in the wrong diameter.

A 2018 Infiniti Q70L can use either 245/50R18 or 245/40R20, depending on the wheel package fitted to that specific car. The same two-size split also applies across the rest of the 2015 to 2019 Infiniti Q70L range, so the year alone does not narrow it to one fitment.

Start with the tire currently on the car and confirm that its full size code matches the wheel diameter you have. If the car has had wheel changes during its life, verify the actual wheel size rather than relying on memory or generic trim assumptions.

Infiniti Q70L tires in these sizes are available with Blackwall, RWL, and Redline sidewall styles. Blackwall appears in the 245/40R20 choices, while RWL and Redline are offered in both 245/40R20 and 245/50R18 through the available Pro-Trac selections.

A buyer choosing for a stock luxury-sedan appearance will usually gravitate toward a more understated sidewall, while RWL or Redline can create a more customized look. Sidewall style does not change the required size, so select appearance only after the correct 18-inch or 20-inch fitment has been confirmed.

Infiniti Q70L tires in these listed sizes are available from BFGoodrich, Nitto, and Pro-Trac. The 245/40R20 size has the broadest brand spread, while the 245/50R18 size is represented here by Pro-Trac offerings.

Brand choice comes after fitment is settled. Once the correct wheel diameter and tire size are confirmed, compare the available sidewall styling and tread family within that size to decide whether you want a more conventional appearance or a more distinctive custom presentation.

Infiniti Q70L tires here appear in several series: g-Force Comp 2 AS, Nitto NT555 G2, g-Force Phenom T/A, and Street Pro III. All are radial tires, but they represent different product families and styling choices within the same general modern-performance size range.

For a Q70L owner, the practical difference is less about basic construction and more about the specific combination of size availability, brand preference, and sidewall treatment. Choose the series only after confirming whether your car needs the 18-inch or 20-inch fitment, then narrow by the look and product family you prefer.

An Infiniti Q70L should be stored on a clean, dry surface away from direct sunlight, ozone sources, and major temperature swings. Keeping the tires properly inflated during storage helps the casing support the vehicle’s weight more evenly, which is especially important on a large luxury sedan.

If the car will sit for long periods, move it periodically so the same spot on each tire is not carrying the load continuously. Long stationary storage on underinflated tires can create flat-spotting and age the rubber unevenly, even when tread depth still looks acceptable.

Tires on an Infiniti Q70L should be inspected regularly, with a visual check before driving and a more careful inspection at routine service intervals. Look for cracking, punctures, bulges, uneven shoulder wear, and any mismatch between the tire size fitted and the wheel diameter on the car.

Because Q70L uses two different wheel-package sizes across the same years, inspection is also a good time to verify that all four tires match the intended setup. Catching wear patterns early can reveal alignment, inflation, or suspension issues before they shorten the life of a relatively specialized size.

Tires on an Infiniti Q70L should be replaced when age-related cracking, structural damage, repeated vibration, or visible deformation appears, even if the tread still seems serviceable. Collector-minded or low-mileage cars often age tires out before they wear them out, and a large sedan can place considerable load on an aging casing.

Use tread depth as only one part of the decision. If the Q70L has spent long periods parked, have the tires evaluated carefully for age and condition, because an attractive sidewall and plenty of remaining tread do not guarantee that the tire is still suitable for road use.

Infiniti Q70L uses two modern radial size families across 2015 through 2019: 245/50R18 and 245/40R20. Those sizes correspond to 18-inch and 20-inch wheel packages, so original fitment for a specific Infiniti Q70L depends on which wheel configuration that individual car carried when new.

For a factory-faithful restoration or preservation-minded car, start by verifying the original wheel package rather than choosing a size by year alone. Original-window-sticker records, service paperwork, and marque-specific references are the best ways to confirm which of the two size and wheel combinations belonged on a particular Q70L.

Correct tire fitment does affect how an Infiniti Q70L presents, especially when the goal is a clean, well-preserved example that reflects its original wheel package. The right 18-inch or 20-inch size keeps the car’s stance, wheel-to-sidewall proportion, and overall appearance in line with how that configuration was intended to look.

For judged events or serious resale presentation, consistency matters as much as the size itself. Matching all four tires to the correct wheel diameter and choosing an appropriate sidewall style will usually support a more credible, coherent presentation than mixing styles or substituting a different-profile size.

Infiniti Q70L tires in these sizes are available with Blackwall, RWL, and Redline sidewall styles. For a restoration-minded or stock-appearance Q70L, the most visually restrained option will usually align best with the character of a late-model luxury sedan, while RWL and Redline create a more custom look.

The right choice depends on whether the goal is factory-like presentation or individualized styling. Decide that after confirming the correct tire size, because sidewall treatment is a cosmetic decision layered on top of the basic fitment requirement of 245/50R18 on 18-inch wheels or 245/40R20 on 20-inch wheels.

These Infiniti Q70L tires are modern radial products in the listed 18-inch and 20-inch sizes, which makes them appropriate in principle for public-road use when they are fitted in the correct size, kept in sound condition, and mounted on the proper wheel diameter. Safety starts with an exact size-to-wheel match.

A Q70L owner should also consider age, inflation, wear pattern, and any prior wheel changes before putting miles on the car. If the sedan has been stored for long periods or has recently changed hands, a careful inspection before regular driving is a sensible first step.

Before driving an Infiniti Q70L, check that all four tires match in size and are appropriate for the wheel diameter fitted to the car. Also inspect inflation pressure, tread and sidewall condition, valve stems, and any signs of uneven wear or impact damage.

Because every Q70L model year here can use either 18-inch or 20-inch tires, this is not just a routine pressure check. It is also a fitment check, especially on cars that may have had wheel swaps, replacement sets installed at different times, or custom sidewall-style changes.

An Infiniti Q70L should always be driven at speeds appropriate to the condition, age, and specification of the tires actually installed on the car. The listed products are modern radial tires, but real-world safe speed still depends on proper inflation, sound condition, and exact fitment to the wheel package in use.

For a low-mileage or collector-kept Q70L, the wiser approach is to treat tire condition as the limiting factor rather than assuming any old-looking tire can support sustained highway use. If there is any doubt about age, prior damage, or storage history, have the set evaluated before extended driving.