The 2011 Infiniti M37 sits in the modern luxury sport-sedan space, blending rear-drive balance, strong V6 performance, and upscale touring character in a way that still appeals to enthusiasts who want a sedan with sharper responses than the average executive car. Tire choice on this model starts with identifying the exact configuration, because the M37 uses either 245/50R18 or 245/40R20 radial fitment depending on sub-model. That split also changes the visual character of the car, from a more traditional 18-inch setup to a lower-profile 20-inch sport presentation. The right choice comes down to matching the wheel diameter, the sub-model, and the look and road use expected from the car.
Which Tire Size Is Right for The 2011 Infiniti M37
The 2011 Infiniti M37 uses two primary tire sizes, and the correct one depends on the exact sub-model and wheel diameter. Luxury and X models use 245/50R18 on an 18-inch rim, while the Sport uses 245/40R20 on a 20-inch rim. Confirming the sub-model and the actual wheels on the car is the first step before comparing brands, sidewall styles, or performance-oriented tire series.
In 245/50R18, 245 is the nominal section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 18 is the wheel diameter in inches. This is a modern radial size that suits the 2011 Infiniti M37 configurations built around an 18-inch setup, giving the car a fuller sidewall profile than the 20-inch Sport fitment. Available choices include Pro-Trac Street Pro III versions with either RWL or Redline sidewall styling. This size is the one to evaluate when the car retains its original-style 18-inch wheel package or when maintaining the Luxury or X sub-model fitment path.
In 245/40R20, 245 is the nominal section width in millimeters, 40 is the aspect ratio, R means radial construction, and 20 designates a 20-inch wheel. On the 2011 Infiniti M37, this size belongs to the Sport configuration and brings a lower-profile tire presentation tied to that larger wheel diameter. Product choices include Blackwall offerings from BFGoodrich and Nitto, along with Pro-Trac Street Pro III versions in RWL and Redline. This is the size to consider when the car is equipped with the Sport wheel setup and the goal is to preserve that specific fitment and appearance.
Sub-model fitment matters on the 2011 Infiniti M37 because tire size is not shared across the full range. Luxury and X models use the same 18-inch tire size, while the Sport moves to a different 20-inch setup, so identifying the exact version of the car comes first.
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2011 Infiniti M37 Luxury
The 2011 Infiniti M37 Luxury uses the 245/50R18 radial size on an 18-inch wheel package. That keeps tire selection focused on choosing the right sidewall style and product character within the correct size rather than deciding between multiple primary fitments.
The 2011 Infiniti M37 Sport uses the 245/40R20 radial size, which sets it apart from the other M37 sub-models. Tire selection here starts with confirming the 20-inch wheels, then comparing Blackwall, RWL, or Redline presentation along with the available sport-oriented series.
The 2011 Infiniti M37 X uses the same 245/50R18 radial size found on the Luxury model. That shared fitment simplifies selection, but it still makes sense to confirm the car has not been changed to a different wheel package before choosing among available tire styles.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 2011 Infiniti M37 Tires for Sale
Available 2011 Infiniti M37 tire choices center on radial fitments in 245/50R18 and 245/40R20, with BFGoodrich, Nitto, and Pro-Trac options depending on size. Shoppers can compare sport-oriented series along with Blackwall, RWL, and Redline sidewall treatments to match the car’s setup and visual style.
These 2011 Infiniti M37 tire FAQs focus on the two correct sizes, sub-model differences, wheel-diameter confirmation, available sidewall and brand choices, and the fitment checks that matter before regular road use.
Tire Size & Fitment
What tire size fits a 2011 Infiniti M37?
The 2011 Infiniti M37 uses two tire sizes depending on sub-model. The Luxury and X models use 245/50R18, while the Sport uses 245/40R20. Both are radial sizes, but they are tied to different wheel diameters and should not be treated as interchangeable just because the section width is the same.
The most important step is confirming whether the car is a Luxury, Sport, or X and checking the actual wheel diameter currently on the vehicle. A car that has been changed from its original wheel package may no longer match its factory sub-model fitment, so size selection should follow the wheels on the car as well as the model designation.
What size rim does a 2011 Infiniti M37 use?
A 2011 Infiniti M37 uses either an 18-inch or 20-inch rim, depending on sub-model. The 245/50R18 fitment uses an 18-inch rim, and the 245/40R20 fitment uses a 20-inch rim. Rim diameter is built directly into the tire size, so matching that number is essential.
Wheel diameter should be confirmed before comparing tires, especially on used cars that may have aftermarket wheels. Checking wheel width also matters once the correct diameter is established, since some tire options within the 20-inch size include stated rim-width ranges that should be reviewed against the wheels actually installed on the car.
Do all 2011 Infiniti M37 sub-models use the same tire size?
No, all 2011 Infiniti M37 sub-models do not use the same tire size. The Luxury and X models share 245/50R18, while the Sport uses 245/40R20. That means the M37 range includes both an 18-inch and a 20-inch fitment, depending on the specific version of the car.
This difference matters because tire selection starts with the sub-model and wheel package, not just the year and model name. The Sport’s lower-profile 20-inch setup creates a different buying decision than the 18-inch Luxury and X fitment, so verifying the trim and current wheels helps avoid choosing a tire built for the wrong configuration.
Choosing the Right Tire
What should I consider when choosing a tire for a 2011 Infiniti M37?
Start with the correct tire size for the exact sub-model: 245/50R18 for Luxury and X, or 245/40R20 for Sport. From there, compare radial construction details, wheel-diameter match, sidewall style, brand, and tire series. The 20-inch fitment also deserves a closer look at any stated rim-width requirements.
Selection should reflect how the car is used and how the owner wants it to look. Some buyers prefer a Blackwall sport-sedan appearance, while others may want RWL or Redline styling for a more distinctive presentation. The best comparison is between tires that keep the correct size and wheel relationship intact for the specific M37 configuration.
What sidewall styles are available for 2011 Infiniti M37 tires?
Sidewall choices for the 2011 Infiniti M37 include Blackwall, RWL, and Redline, depending on tire size and product line. The 245/50R18 size is available in RWL and Redline through Pro-Trac Street Pro III, while the 245/40R20 size includes Blackwall options from BFGoodrich and Nitto plus RWL and Redline choices from Pro-Trac.
That variety allows the tire to influence the car’s visual tone as much as its fitment. Blackwall keeps a more modern, understated look, while RWL and Redline create a more expressive appearance. Sidewall style should be chosen after the correct size is confirmed, since not every visual treatment appears in both M37 fitments.
What brands offer tires for the 2011 Infiniti M37?
Tires for the 2011 Infiniti M37 are available from Pro-Trac, BFGoodrich, and Nitto, depending on the size. Pro-Trac covers both primary fitments, while BFGoodrich and Nitto appear in the 245/40R20 Sport size. Brand choice is therefore tied partly to which M37 sub-model and wheel package the car uses.
The practical way to compare brands is to stay within the correct tire size and then look at the series and sidewall treatments each one offers. A 20-inch Sport owner can compare multiple Blackwall performance-oriented choices, while an 18-inch Luxury or X owner is focused more narrowly on the available Pro-Trac presentation options in that size.
Restoration & Appearance
Which tire should I choose for a period-style 2011 Infiniti M37?
A period-style 2011 Infiniti M37 tire choice starts with keeping the correct sub-model size and wheel diameter intact. That means 245/50R18 for Luxury and X or 245/40R20 for Sport. Once the fitment is right, the appearance decision shifts to sidewall treatment and overall visual character within those modern radial sizes.
An owner aiming for a cleaner, contemporary luxury-sedan look may lean toward Blackwall, while RWL or Redline can create a more assertive visual statement. Since exact originality can matter to some collectors, appearance-sensitive choices are best cross-checked with period photography, original sales material, or marque-specific reference sources for the intended presentation.
How does tire construction affect the appearance of a restored 2011 Infiniti M37?
Tire construction is straightforward on the 2011 Infiniti M37 because its primary fitments are radial. The visual impact comes less from choosing between bias-ply and radial, and more from selecting the correct modern profile and sidewall treatment for the specific wheel package, whether 18-inch Luxury and X or 20-inch Sport.
Keeping the proper size preserves the relationship between wheel diameter, sidewall height, and the car’s stance. After that, appearance differences come from details such as Blackwall, RWL, or Redline rather than a change in basic construction type. That makes size accuracy especially important for anyone trying to maintain the M37’s intended luxury-sport balance.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2011 Infiniti M37?
Yes, modifications can affect tire fitment on a 2011 Infiniti M37. Aftermarket wheels, suspension changes, ride-height adjustments, and body modifications can all change the space available around the tire. That matters even when the tire size sounds familiar, because wheel diameter and wheel width still have to work with the car’s actual setup.
A modified M37 should be checked for fender clearance, steering clearance, and wheel compatibility before new tires are selected. The factory sub-model size remains the right starting point, but the final choice should follow the car as it sits today. That is especially important when moving between the 18-inch and 20-inch fitment paths.
What should I inspect before driving a 2011 Infiniti M37 on new tires?
Before driving a 2011 Infiniti M37 on new tires, inspect the wheels for the correct diameter, verify proper inflation, and look over the suspension and alignment condition. It also helps to confirm there is no contact at the fenders or steering components, especially if the car has non-original wheels or any ride-height changes.
A short initial road check is useful to catch vibration, pull, or rubbing before regular driving. Rechecking air pressure after installation is also worthwhile, since collector and low-mileage cars sometimes sit long enough for small issues to go unnoticed. Starting with a sound wheel and suspension foundation helps any correct-size tire perform as intended.
How often should tires on a 2011 Infiniti M37 be inspected?
Tires on a 2011 Infiniti M37 should be inspected regularly, not just when tread looks low. Sidewall cracking, cuts, bulges, uneven wear, and repeated air loss all deserve attention, and a car that is driven infrequently still needs periodic checks because age and storage conditions can affect the tires even when mileage stays modest.
A practical routine is to inspect the tires during pressure checks and before longer drives. Cars stored for extended periods benefit from extra attention to flat spotting, visible aging, and moisture exposure. Keeping the correct 18-inch or 20-inch fitment in good condition is just as important as selecting the right size in the first place.
