In 2009, Infiniti balanced luxury and performance with a range that stretched from the athletic G37 sport sedan and coupe family to the larger, rear-drive M35 and V8-powered M45 executive sedans. That mix means 2009 Infiniti tire selection is not one-size-fits-all: three models share two performance-oriented radial sizes, while the G37 alone adds three more fitments across 17-, 18-, and 19-inch wheels. The real choice usually starts with identifying the exact model and wheel diameter, then narrowing by the tire size that matches your car's setup. Confirm those two points first, and choosing the right construction and product becomes much more straightforward.
Which Tire Size Is Right for Your 2009 Infiniti
Five tire sizes are used across 2009 Infiniti vehicles, and they vary by model rather than carrying across the full lineup. All five are radial metric sizes, so the key decision is confirming which model you have and which wheel diameter it uses first, especially since 17-, 18-, and 19-inch fitments all appear in the same model year. Understanding that distinction before choosing a product saves time and helps match the tire to the correct car.
Year(s): 2009|Fit(s): G37|Construction: Radial|Rim: 19 in
225/45R19 is a radial metric size with a 225-millimeter section width, a 45-series aspect ratio, and a 19-inch rim diameter. This G37-specific size is available from BFGoodrich in Blackwall form, with W- and Y-rated options reaching 112 mph and 186+ mph respectively. It suits a G37 already equipped with 19-inch wheels and is the right starting point when you want to stay with the factory-style diameter and a modern performance radial.
Year(s): 2009|Fit(s): G37|Construction: Radial|Rim: 18 in
225/50R18 is a radial metric size that measures 225 millimeters in section width, uses a 50-series profile, and fits an 18-inch wheel. This size is specific to the G37, and BFGoodrich offers it in Blackwall styling with W-rated products up to 112 mph. It is a sensible choice for G37 applications built around 18-inch wheels, especially when the goal is to keep the proper fitment without moving to a different rim diameter.
Year(s): 2009|Fit(s): G37, M35, M45|Construction: Radial|Rim: 19 in
245/40R19 is a radial metric size with a 245-millimeter section width, a 40-series profile, and a 19-inch rim diameter. BFGoodrich offers this size in Blackwall form, with W- and Y-rated choices reaching 112 mph and 186+ mph respectively. Because this size is shared by the G37, M35, and M45, it is one of the common fitments for buyers comparing sport-oriented 19-inch setups across the 2009 Infiniti range.
Year(s): 2009|Fit(s): G37, M35, M45|Construction: Radial|Rim: 18 in
245/45R18 is a radial metric size with a 245-millimeter section width, a 45-series aspect ratio, and an 18-inch rim diameter. This shared size is available from BFGoodrich and Nitto in Blackwall styling, with W- and Y-rated versions reaching 112 mph and 186+ mph respectively. It is the broadest crossover fitment in the 2009 Infiniti lineup, making it a strong starting point for G37, M35, and M45 owners running 18-inch wheels.
Year(s): 2009|Fit(s): G37|Construction: Radial|Rim: 17 in
225/55R17 is a radial metric size with a 225-millimeter section width, a 55-series profile, and a 17-inch rim diameter. This G37-only size is available from BFGoodrich in both Blackwall and Wide Whitewall styles, and the performance-oriented Blackwall versions carry W ratings up to 112 mph. It gives G37 owners the most visual variety of any size in the 2009 Infiniti range, especially for drivers who want either a contemporary look or a custom whitewall presentation on 17-inch wheels.
Three Infiniti model lines are covered for 2009. Tire size varies by model, and in the case of the G37, it also varies by wheel package, so identifying the exact model is an important first step before choosing a tire. Select a model below to narrow the fitment history and see the products that match its specific tire sizes.
2009 Infiniti G37
The 2009 G37 was Infiniti's performance-minded luxury coupe and sedan family, known for blending a strong V6 with sharp styling and a more athletic character than the brand's larger sedans. Its tire fitments span 17-, 18-, and 19-inch wheels, which makes it the broadest and most wheel-package-sensitive model in the 2009 Infiniti range.
The 2009 M35 sat in Infiniti's midsize luxury sport sedan territory, offering a more substantial, comfort-oriented package than the G while still keeping a rear-drive performance feel. Its tires mount on either 18- or 19-inch wheels, and both fitments are shared with other 2009 Infiniti models rather than being exclusive to the M35.
The 2009 M45 was the V8 version of Infiniti's M sedan, aimed at buyers who wanted the same upscale executive shape with more power and a distinctly muscular personality. Like the M35, it uses 18- and 19-inch wheel fitments, so tire selection comes down to confirming which wheel diameter is on the car rather than choosing between unique M45-only sizes.
Eighteen products are available across five tire sizes for 2009 Infiniti vehicles. 225/45R19, 225/50R18, and 245/40R19 come from BFGoodrich in radial Blackwall form; 245/45R18 adds Nitto to the radial Blackwall mix; and 225/55R17 is available from BFGoodrich in radial Blackwall and Wide Whitewall styles. Confirm the exact size and wheel diameter before selecting.
These answers cover how 2009 Infiniti sizes differ between the G37, M35, and M45, what the metric codes mean, which sidewall styles and brands are offered, and what to inspect on a performance-oriented modern classic before regular driving or long-term storage.
Size Basics & Fitment
What tire sizes fit 2009 Infiniti vehicles?
2009 Infiniti vehicles use five tire sizes across three model lines: 225/45R19, 225/50R18, 245/40R19, 245/45R18, and 225/55R17. The G37 uses all five depending on wheel package, while the M35 and M45 use 245/45R18 and 245/40R19. Rim diameter is not shared across the whole range, since 17-, 18-, and 19-inch applications all appear in the same year.
That means year and make alone are not enough for a confident selection on a 2009 Infiniti. Start by confirming the exact model, then verify the wheel diameter currently on the car, and finally compare the recommended rim-width range for the tire size you are considering. That process is especially important on G37s, where multiple factory-style fitments exist.
What does 225/55R17 mean on a 2009 Infiniti tire?
On a 2009 Infiniti, 225/55R17 means the tire is 225 millimeters wide, has a 55-series aspect ratio, uses radial construction, and fits a 17-inch wheel. Within this year and make, that size belongs to the G37. Products in this size span Blackwall performance radials and a Wide Whitewall radial option, so the size code identifies fitment while the product choice shapes the look and character.
That breakdown matters because 225/55R17 is not interchangeable with the 18- and 19-inch Infiniti sizes unless the wheels change as well. If your G37 wears 17-inch wheels, confirm the tire fits the wheel width you have, then choose the sidewall style and tread personality that best match how the car is used and presented.
Do all 2009 Infiniti models use the same tire size?
No, 2009 Infiniti models do not all use the same tire size. The M35 and M45 share two sizes, 245/45R18 and 245/40R19, while the G37 can use those same sizes plus 225/45R19, 225/50R18, and 225/55R17 depending on its configuration. The shared Infiniti family resemblance does not translate into a single universal fitment.
That difference has a practical effect when replacing tires on a car you did not order new or a car that may have changed wheels over time. A quick look at the sidewall size code and wheel diameter is more useful than assuming all 2009 Infiniti sedans or coupes are the same. It prevents mismatching a tire to the wrong wheel or ordering by model name alone.
Buying the Right Tire
What sidewall styles are available for 2009 Infiniti tires?
Most 2009 Infiniti sizes are available in Blackwall form, which is the only sidewall style offered for 225/45R19, 225/50R18, 245/40R19, and 245/45R18. The exception is 225/55R17, where BFGoodrich also offers a Wide Whitewall radial. That gives the G37's 17-inch application a styling option that does not appear on the other 2009 Infiniti sizes.
For a factory-like late-2000s presentation, Blackwall is the natural visual match. The Wide Whitewall option is better understood as a custom-look choice rather than a stock appearance for a 2009 Infiniti, and it will change the personality of the car immediately. Choose the sidewall treatment with the same care you give the wheel diameter, because it has a strong effect on the finished look.
What brands make tires for 2009 Infiniti vehicles?
BFGoodrich covers every 2009 Infiniti size used here, including 225/45R19, 225/50R18, 245/40R19, 245/45R18, and 225/55R17. Nitto also appears in 245/45R18, which is shared by the G37, M35, and M45. Brand choice is therefore widest in that 18-inch shared fitment, while the other sizes stay within the BFGoodrich range.
That matters most when you are comparing the broadest selection against a very specific factory-size need. If your car uses 245/45R18, you have a little more room to compare brand character within the same size. If it uses one of the G37-only sizes, the decision tends to focus more on exact fitment, speed rating, and sidewall appearance than on brand variety.
What is the difference between BFGoodrich and Nitto choices for the 245/45R18 size on a 2009 Infiniti?
In 245/45R18 for a 2009 Infiniti, BFGoodrich and Nitto both offer Blackwall radial tires, but their published details are not identical. BFGoodrich choices include W- and Y-rated versions, with load figures reaching 1,764 pounds at 50 psi on the g-Force Phenom T/A, while Nitto's NT555 G2 is W-rated with a 1,764-pound load figure at 50 psi. Rim-width guidance centers on the same general range, from 7.5 to 9.0 inches.
That makes this a matter of comparing the exact series character and rating rather than chasing a basic fitment difference. A buyer who wants the highest stated speed ceiling within this size may lean toward the Y-rated BFGoodrich option, while someone comparing within W-rated products can look more closely at the series and tire profile they prefer. Either way, keep the decision inside the correct 245/45R18 fitment.
Fitting & Setup
What rim width do 2009 Infiniti tires require?
Rim-width guidance varies by size on 2009 Infiniti vehicles. 225/45R19 fits 7.0 to 8.5 inches, 225/50R18 fits 6.0 to 8.0 inches, 245/40R19 fits 8.0 to 9.5 inches, 245/45R18 fits 7.5 to 9.0 inches, and 225/55R17 generally fits 6.0 to 8.0 inches, with one wide-whitewall radial extending to 9.0 inches. Those ranges are important because two tires with the same overall size can still have different wheel-width tolerance depending on the specific product.
Measure the wheel that is actually on the car before choosing among products, especially if the vehicle has aftermarket wheels or a custom setup. Staying inside the approved width range helps maintain the intended tread shape and sidewall support. On G37s in particular, this is a useful cross-check because several wheel diameters and widths can exist under one model name.
Can the original 2009 Infiniti wheels be used with all tire sizes?
No single original 2009 Infiniti wheel can be assumed to work with all five tire sizes, because those sizes span 17-, 18-, and 19-inch rim diameters. A 17-inch wheel only accepts 225/55R17, an 18-inch wheel must stay with 225/50R18 or 245/45R18 as applicable, and a 19-inch wheel must stay with 225/45R19 or 245/40R19 as applicable. Rim diameter is the first non-negotiable fitment point.
Wheel width matters next, since each size carries its own approved range. If the car still has its original wheels, matching the existing sidewall size is usually the cleanest path. If the car has changed hands or has been modified, verify both the wheel diameter and measured wheel width before deciding that another 2009 Infiniti size will interchange.
Maintenance, Storage & Longevity
How should I store a 2009 Infiniti when the tires are fitted?
A stored 2009 Infiniti should be kept in a cool, dry, shaded space away from direct sunlight, electric motors, battery chargers, furnaces, and other ozone-producing equipment that can age rubber prematurely. Keep the tires properly inflated, roll the car periodically if possible, and avoid letting one contact patch carry the car's weight in the same place for many months. These are all radial tires, which generally tolerate storage better than older bias-ply designs, but they still age from time, heat, and environment.
If the car will sit for an extended season, cleaning the tires and checking pressure every few weeks goes a long way. Some owners also use tire cradles or stands to reduce flat spotting during long dormant periods. Storage care matters just as much on a low-mileage G37 or M sedan as it does on an older collector car, because age and environment can shorten tire life before the tread is worn out.
How long do tires on a 2009 Infiniti typically last?
On a 2009 Infiniti, tire life is best judged by age, condition, and service history rather than by mileage alone. A good rule is to begin evaluating tires closely once they reach about five to seven years of age, and to consider replacement around ten years regardless of remaining tread. The DOT date code on the sidewall tells you when each tire was made, and that date matters on a low-use luxury or performance car that may spend long periods parked.
A tire can look acceptable at first glance and still be past its ideal service life, especially on a car that only comes out on weekends. Sidewall cracking, hardening, vibration, and loss of wet-weather confidence are all warning signs to treat seriously. If the manufacturing date is old enough to raise concern, replacement is usually a smarter decision than trying to stretch a few more seasons out of the set.
How often should tires on a 2009 Infiniti be inspected?
Tires on a 2009 Infiniti deserve a quick inspection before every drive and a more thorough inspection before any extended highway outing. Look for cracking, cuts, punctures, bulges, unusual inner-edge or outer-edge wear, and any sign that one tire is losing pressure faster than the others. Performance-oriented sedans and coupes can mask tire issues until speed rises, so small warning signs should be taken seriously.
A monthly pressure check and a close sidewall inspection are smart habits even when the car is driven sparingly. If the vehicle has sat for a while, pay extra attention to vibration during the first few miles and recheck the tires once they have warmed up. Uneven wear can also point to alignment or suspension concerns, so tire inspection is an early warning system for the car as a whole.
Safety & Road Use
Are 2009 Infiniti tires safe for highway driving?
Yes, the 2009 Infiniti sizes here are highway-capable radial tires, and the speed ratings are well beyond normal U.S. interstate use. W-rated products are rated to 112 mph, while Y-rated products reach 186+ mph, depending on the exact size and series. That means the tire's published speed ceiling is generally not the limiting factor during ordinary road use on a G37, M35, or M45.
Real-world safety comes down to the condition of the tire, proper inflation, alignment, and the mechanical health of the car. A 2009 Infiniti may still feel modern enough to hide age-related issues, so do not rely on appearance alone. Choose the correct size, keep speeds within legal limits, and inspect the tires regularly if the car sees spirited driving or long gaps between outings.
What inflation pressure should I use for 2009 Infiniti tires?
Inflation pressure on a 2009 Infiniti should follow the vehicle's original placard or owner's manual for normal service, while the tire's own maximum-pressure marking should be understood as a load-rating reference rather than a universal everyday setting. Among the tires here, published load-and-pressure pairings include 1,565 pounds at 50 psi, 1,653 pounds at 50 psi, 1,709 pounds at 50 psi, 1,764 pounds at 50 psi, 1,819 pounds at 50 psi, and one BFGoodrich product at 1,565 pounds at 51 psi.
Do not transfer one pressure figure from one size to another just because the cars are from the same year and make. A G37 on 225/55R17, for example, should not be treated the same as an M45 on 245/40R19 without checking the car's own specification. Use the vehicle recommendation as the baseline, then confirm that the tire is in good condition and carrying pressure evenly across the set.
What should I check before taking a 2009 Infiniti on a longer drive?
Before a longer drive in a 2009 Infiniti, inspect each tire for sidewall cracking, punctures, cuts, bulges, uneven wear, and any sign of prior impact damage. Confirm cold inflation pressures, look at the spare if the car still carries one, and make sure the wheel and tire size on the car matches the size you expect. On higher-speed luxury cars, even a minor tire issue can become much more noticeable once the trip settles into highway pace.
It is also smart to think beyond the tires, since a 2009 Infiniti may combine age with performance. Check alignment feel, brake behavior, and whether the car has developed a vibration after sitting. If the tires are older, recently flat-spotted, or showing uneven wear, solve that before the trip rather than hoping the problem smooths out after a few miles.
