2013 Infiniti Tire Fitment Guide

2013 Infiniti vehicles use seven sizes across four model lines: 225/45R19, 225/50R18, 245/40R19, 245/45R18, and 225/55R17 for the G37; 245/50R18 for the M35h, M37, and M56; and 245/40R20 for the M37 and M56. Rim diameters therefore span 17, 18, 19, and 20 inches across the full 2013 Infiniti range. Where rim width guidance is available, 225/45R19 fits 7.0 to 8.5-inch rims, 225/50R18 fits 6.0 to 8.0-inch rims, 245/40R19 fits 8.0 to 9.5-inch rims, 245/45R18 fits 7.5 to 9.0-inch rims, 225/55R17 fits 6.0 to 9.0-inch rims, and 245/40R20 fits 8.0 to 9.5-inch rims.

That spread means a 2013 Infiniti owner should identify the exact model and wheel diameter before narrowing down brands or sidewall style. The G37 has the broadest range and can appear on 17-, 18-, or 19-inch tires, while the M-series cars are more consolidated around 18-inch and 20-inch applications. If the car has aftermarket wheels, confirm the wheel diameter and compare the installed size against the door-jamb placard or factory fitment information before choosing a replacement.

On a 2013 Infiniti, 225/45R19 is a metric radial size code. The 225 is the 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 19 is the wheel diameter in inches. That format is used on modern vehicles and is straightforward once the numbers are broken into width, profile, construction, and rim diameter.

Understanding the code helps you avoid substituting a tire that changes the wheel diameter or overall profile in ways Infiniti did not intend for that fitment. On the 2013 G37, 225/45R19 is one of several possible factory-type sizes, so the important point is not just reading the code but matching it to the actual wheel on the car. If you are comparing tires within that size, then the next step is looking at load rating, speed rating, and the approved rim-width range.

No, 2013 Infiniti models do not all use the same tire size. The G37 uses five sizes across 17-, 18-, and 19-inch wheels, the M35h uses 245/50R18, and the M37 and M56 use 245/50R18 or 245/40R20 depending on wheel package. Even when two sizes share the same section width, the rim diameter and sidewall profile can be completely different, so they are not interchangeable by default.

That matters most for buyers who know the car is a 2013 Infiniti but have not yet narrowed it to a G37, M35h, M37, or M56. The G37 in particular spans several fitments, including both narrower and wider 18- and 19-inch sizes. Once you identify the model, use the wheel diameter as the next checkpoint and then compare the exact tire size already on the car before choosing between available brands and sidewall treatments.

2013 Infiniti tires are available in several sidewall styles depending on size. Blackwall is the most common across the G37’s 17-, 18-, and 19-inch metric radial sizes and also appears in 245/40R20 for the M37 and M56. The 225/55R17 G37 fitment also comes in a Wide Whitewall version, while 245/50R18 for the M35h, M37, and M56 is available in RWL and Redline form, and 245/40R20 adds an RWL option alongside Blackwall.

For a factory-like late-model luxury or sport-sedan appearance, blackwall is the natural visual fit for most 2013 Infiniti applications. Whitewall, redline, and raised-white-letter styles push the car toward a custom or personalized look rather than a stock presentation. That can be attractive on an enthusiast build, but it changes the visual character of the car considerably, so choose sidewall style with the car’s intended look in mind, not just the tire size.

Three brands cover the 2013 Infiniti fitments here: BFGoodrich, Nitto, and Pro-Trac. BFGoodrich spans the largest share of the range, covering every G37 size and also the 245/40R20 size used on M37 and M56. Nitto appears in 245/45R18 for the G37 and 245/40R20 for the M37 and M56, while Pro-Trac covers 245/50R18 for M35h, M37, and M56 and also offers 245/40R20 for M37 and M56.

Brand choice on a 2013 Infiniti often follows the size first and the desired look second. G37 owners in 17-, 18-, or 19-inch fitments will mostly be comparing BFGoodrich options, with Nitto joining the mix in 245/45R18. M-series owners using 245/50R18 or 245/40R20 have more scope to choose between custom-style sidewall treatments and more conventional blackwall performance radials, so the car’s appearance goals matter along with the size itself.

For 2013 Infiniti fitments where both are offered, BFGoodrich g-Force Phenom T/A and BFGoodrich g-Force COMP-2 A/S share the same basic radial construction and blackwall appearance, but they differ in rating details and some published capacities. In 225/45R19, the COMP-2 A/S carries a 92W marking while the Phenom T/A carries 96Y with a stated 1,565-pound maximum load at 50 psi. In 245/45R18, the COMP-2 A/S carries 96W while the Phenom T/A carries 100Y with a stated 1,764-pound maximum load at 50 psi.

The practical takeaway is to compare the exact version within your exact size, not just the series name. On a 2013 Infiniti G37 or M-series application where multiple BFGoodrich choices exist, the size-specific load index, speed letter, and sometimes weight can vary enough to matter. If you are deciding between the two, match the tire to the wheel diameter first, then compare the sidewall marking and capacity of the individual tire rather than assuming every tire in those two lines is equivalent.

Rim width guidance for 2013 Infiniti tires varies by size. 225/45R19 fits 7.0 to 8.5-inch rims, 225/50R18 fits 6.0 to 8.0-inch rims, 245/40R19 fits 8.0 to 9.5-inch rims, 245/45R18 fits 7.5 to 9.0-inch rims, 225/55R17 fits 6.0 to 9.0-inch rims, and 245/40R20 fits 8.0 to 9.5-inch rims. Those ranges are broad enough to cover more than one wheel design, but they are still specific to each tire size.

Use those ranges as a compatibility check against the actual wheel on the car, especially if the 2013 Infiniti has been fitted with aftermarket wheels. A correct rim diameter does not automatically mean the rim width is ideal for every tire in that diameter. If you are replacing only tires and not wheels, confirm the wheel width stamping or the wheel manufacturer’s spec before moving forward with a wider or lower-profile size within the G37 or M-series range.

The 2013 Infiniti tires here are modern radial fitments, and none of the size markings shown for these applications carry a tube-type designation. That makes these fitments consistent with tubeless passenger-car use in the products available across the G37, M35h, M37, and M56 sizes. Tube-type concerns that apply to much older bias-ply or specialty applications do not define this 2013 Infiniti range.

The important setup check is the wheel condition and the valve stem, especially on a car that has spent time parked or has aftermarket rims. A tubeless tire still depends on a sound bead seat, a correct valve stem, and a wheel free of corrosion or damage where the tire seals. If the car has custom wheels or has sat for long periods, inspect those points before mounting new tires so the finished setup holds pressure properly.

A 2013 Infiniti should be stored in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing equipment that can accelerate sidewall aging. Keep the tires clean, maintain inflation, and move the car periodically if it will sit for extended periods. Because every fitment here is radial, you avoid some of the flat-spot sensitivity associated with older bias-ply tires, but long static storage can still leave temporary shape set or pressure loss.

For a seasonal or collector-driven 2013 Infiniti, good storage habits preserve both appearance and service life. If the car will be parked for months, many owners either roll it occasionally or support it in a way that reduces long-term static load. The goal is not just protecting tread but preventing cracks, seal problems, and irregular wear patterns that can show up the next time the car goes back on the road.

Tires on a 2013 Infiniti are usually judged by age and condition as much as by tread depth, especially on low-mileage enthusiast cars. A practical rule is to start evaluating them closely at about five to seven years from the DOT date code and to give serious replacement consideration by around ten years, even if the tread still looks usable. Heat cycles, storage conditions, sun exposure, and long periods of inactivity can age a tire before mileage does.

That matters because many G37 and M-series cars are no longer daily transportation for every owner. A tire that looks healthy from across the garage can still be aging internally or developing subtle sidewall cracking. Check the DOT date code on every tire, including the spare if present, and weigh age along with tread wear when deciding whether the current set is still appropriate for regular use or only for very limited local driving.

Tires on a 2013 Infiniti should be inspected before every drive and more thoroughly before any longer trip. Look for sidewall cracking, tread damage, punctures, bulges, uneven wear, and any sign that the tire is losing pressure. Because these are tubeless radial passenger-car fitments, the valve stem and the bead-sealing area at the wheel also deserve attention, especially on older wheels or wheels that have been refinished.

Frequent inspection is especially important on a 2013 Infiniti that sees irregular use, because problems often develop while the car is parked rather than while it is accumulating miles. A quick walkaround catches obvious issues, but a hand-on inspection is better before highway use or spirited driving. Uneven shoulder wear can also point to alignment or suspension issues, which matter on cars like the G37 and M-series where handling response is part of the ownership experience.

The 2013 Infiniti tires here are modern radial designs, and several sizes carry W and Y speed ratings. W-rated tires have a 112 mph ceiling, while Y-rated tires carry a 186+ mph ceiling in the sidewall marking. Those numbers are far above normal U.S. highway use, so in everyday driving the more important safety factors are proper inflation, tire age, wheel condition, alignment, and the car’s overall mechanical health rather than the headline speed symbol alone.

That said, highway safety is still size-specific and condition-specific. A fresh, correctly matched tire in the right size is one part of the picture, but a 2013 Infiniti with worn shocks, poor alignment, or old brake components can still feel unstable or unsafe at speed. Confirm the exact size for the model, inspect the tires closely, and make sure the rest of the chassis is ready before assuming the tire’s speed rating by itself answers the safety question.

Inflation pressure for a 2013 Infiniti should start with the factory vehicle recommendation for the specific model and size, usually found on the driver-door placard or in the owner’s manual. Tire markings here include maximum load and pressure figures on some products, such as 225/45R19 at 1,565 pounds at 50 psi, 225/50R18 at 1,709 pounds at 50 psi, 245/40R19 at 1,653 pounds at 50 psi, 245/45R18 at 1,565 or 1,764 pounds around 50 to 51 psi depending on product, 225/55R17 at 1,609 or 1,819 pounds around 50 to 51 psi, and 245/40R20 at 1,709 pounds at 50 psi.

Those tire-sidewall figures are not a blanket instruction to run every 2013 Infiniti at 50 psi. They show the pressure tied to the tire’s maximum rated load, not necessarily the vehicle manufacturer’s operating recommendation. The safe approach is to use Infiniti’s recommended pressure for your exact model and size, then confirm that the chosen tire’s own pressure and load rating are appropriate for the application. Never transfer a pressure figure from one Infiniti size to another just because the tires look similar.

Before a longer drive in a 2013 Infiniti, inspect each tire for cuts, bulges, embedded objects, tread irregularity, sidewall cracking, and proper cold inflation pressure. Check that every tire matches the intended size for the model and wheel package, and inspect the valve stems and the spare if the car still carries one. On lower-profile 18-, 19-, and 20-inch applications, also look closely for wheel damage or bent lips that can affect sealing and ride quality.

A long-trip check should also include the broader mechanical systems that matter on an aging performance-luxury car: brakes, fluids, battery condition, and suspension health. Tires are the road contact point, but they work with the rest of the car, and Infiniti’s sharper-driving models are especially sensitive to alignment and pressure issues. Taking a few minutes to inspect the whole setup can prevent vibration, pressure loss, and heat-related trouble once the miles start adding up.