The 2013 Infiniti Trucks FX37 sits in the early era of luxury crossover performance, blending sport-oriented styling with the ride height and utility buyers expected from a premium midsize SUV. That combination makes tire choice especially important, because appearance, road manners, and wheel setup all play into how the FX37 presents and drives. This model uses radial tire fitments in either 265/50R20 or 265/60R18, depending on the wheel package on the vehicle. The key decision is less about vintage construction and more about confirming the actual rim diameter, then choosing the right metric radial size to match it. For replacement planning, wheel verification should come before comparing tire models.
Which Tire Size Is Right for The 2013 Infiniti Trucks FX37
The 2013 Infiniti Trucks FX37 uses two primary tire sizes, and the correct one depends on the wheel diameter on the vehicle. Both are radial metric fitments, but one is built for an 18-inch rim and the other for a 20-inch rim, so confirming the actual wheel setup is the first step before choosing a replacement tire.
A 265/50R20 tire uses a 265-millimeter nominal section width, a 50-series aspect ratio, radial construction, and a 20-inch rim diameter. On the 2013 Infiniti Trucks FX37, this size is tied to a larger-wheel setup that keeps the vehicle in a modern metric radial format rather than an older numeric or alphanumeric system. Its measured overall diameter remains close to the alternate FX37 fitment, which helps explain why both sizes serve the same model with different wheels. Choosing this size starts with confirming that the vehicle actually carries 20-inch rims rather than relying on appearance alone.
A 265/60R18 tire also carries a 265-millimeter nominal section width, but its 60-series profile is paired with an 18-inch rim. For the 2013 Infiniti Trucks FX37, this is the companion radial fitment for vehicles equipped with the smaller factory-style wheel diameter. Its section width is the same as the 20-inch option, while the sidewall and rim relationship differ to suit a different wheel package. This size should be evaluated by checking the wheel diameter on the vehicle first, especially if the FX37 has changed hands or has had wheel swaps over time.
The covered sub-model fitment is straightforward, but it still requires a wheel check because the same FX37 Base can use either of two radial tire sizes. The important step is confirming whether the vehicle has 18-inch or 20-inch rims before selecting a replacement tire.
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2013 Infiniti Trucks FX37 Base
The 2013 Infiniti Trucks FX37 Base can use either primary radial fitment, with the choice determined by the wheel diameter on the vehicle rather than by a separate construction change. Tire selection comes down to verifying whether the FX37 Base has 18-inch or 20-inch rims, then matching the correct metric radial size to that setup.
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.
Frequently Asked Questions
Owners of a 2013 Infiniti Trucks FX37 usually need to confirm the correct tire size by wheel diameter first. The questions below focus on 18-inch versus 20-inch fitment, radial sizing, replacement selection, and the checks worth making before road use.
Tire Size & Fitment
What tire size fits a 2013 Infiniti Trucks FX37?
The 2013 Infiniti Trucks FX37 uses two primary tire sizes: 265/50R20 and 265/60R18. Both are radial metric fitments, and each size corresponds to a different wheel diameter on the vehicle rather than a change to an older tire construction style.
The practical next step is to confirm which wheels are actually on the FX37 before ordering tires. An 18-inch rim requires 265/60R18, while a 20-inch rim requires 265/50R20. That matters especially on used vehicles, since wheel changes can happen over time and the correct tire size follows the rim, not the badge.
What size rim does a 2013 Infiniti Trucks FX37 use?
A 2013 Infiniti Trucks FX37 can use either an 18-inch or a 20-inch rim, depending on the wheel package on the vehicle. The 265/60R18 tire matches the 18-inch setup, and the 265/50R20 tire matches the 20-inch setup.
Rim diameter is the first fitment detail to verify because the two FX37 tire sizes are not interchangeable across different wheel diameters. Checking the sidewall on the current tires or measuring the wheel directly is more reliable than judging by appearance. Once the rim diameter is confirmed, the replacement search becomes much more straightforward.
Why does the 2013 Infiniti Trucks FX37 have more than one tire size?
The 2013 Infiniti Trucks FX37 has more than one tire size because it was fitted with different wheel diameters. One setup uses 265/60R18 on an 18-inch rim, while the other uses 265/50R20 on a 20-inch rim, with both remaining radial metric fitments.
That means the correct replacement tire is tied to the wheel package rather than to a different sub-model construction type. Since the measured overall diameters are close, the main distinction is wheel size and sidewall profile. Buyers should verify the actual wheels on the vehicle before comparing tire options, especially if the FX37 has aftermarket wheels.
Choosing the Right Tire
What should I consider when choosing a tire for a 2013 Infiniti Trucks FX37?
Start with the correct primary size for the wheel diameter on the vehicle: 265/60R18 for 18-inch rims or 265/50R20 for 20-inch rims. Because both are radial metric fitments for the same 2013 Infiniti Trucks FX37, the selection process begins with basic fitment accuracy rather than a bias-ply versus radial decision.
After size is confirmed, compare the tire's intended use with how the FX37 is driven. A replacement tire should suit the wheel setup, maintain proper clearance, and match the vehicle's overall road-use needs. It also helps to inspect the current wheel and tire combination closely, since previous owners may have changed wheels or suspension parts.
How do I choose between the available 2013 Infiniti Trucks FX37 tire sizes?
Choosing between the two FX37 tire sizes is not a matter of preference alone, because each size is tied to a specific rim diameter. The 265/60R18 size belongs on an 18-inch wheel, while the 265/50R20 size belongs on a 20-inch wheel.
Once the wheel diameter is verified, the remaining decision is about replacement style within that correct size rather than switching between the two fitments. The 20-inch setup carries a lower-profile look, while the 18-inch setup uses more sidewall. Either way, keeping the tire matched to the actual wheel is the key fitment safeguard.
What rim-fitment details should I compare when choosing 2013 Infiniti Trucks FX37 tires?
The most important rim-fitment detail on a 2013 Infiniti Trucks FX37 is diameter, because this model uses both 18-inch and 20-inch wheel setups. Tire size must match that rim exactly, so 265/60R18 belongs with 18-inch wheels and 265/50R20 belongs with 20-inch wheels.
Wheel condition and any non-original changes also matter before replacement. A used FX37 may have aftermarket wheels, and those can affect how a tire sits or clears surrounding components. Confirming wheel diameter first, then checking overall wheel setup and visible clearance, helps avoid ordering a tire that matches the badge but not the actual vehicle.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2013 Infiniti Trucks FX37?
Yes. Modifications can affect tire fitment on a 2013 Infiniti Trucks FX37, especially if the vehicle has aftermarket wheels, altered suspension height, or wheel-offset changes. Even though the primary sizes are 265/50R20 and 265/60R18, changes to the wheel or suspension setup can alter clearance at the fender, steering, or suspension points.
That is why the vehicle should be checked as it sits today rather than assumed to match its original wheel package. A visual inspection at full steering lock and around the wheelhouse can reveal issues early. On a modified FX37, replacement selection should follow the actual wheel dimensions and available clearance, not just the model year.
What should I inspect before driving a 2013 Infiniti Trucks FX37 on new tires?
Before driving a 2013 Infiniti Trucks FX37 on new tires, inspect the wheel diameter, tire pressure, and general condition of the surrounding wheel and suspension hardware. It also makes sense to confirm that the installed size matches the wheel, since this model can use either 265/60R18 or 265/50R20 depending on rim diameter.
A careful walk-around should include checking for uneven seating, visible rubbing points, and any obvious cuts, bulges, or air loss concerns. The first miles are also a good time to pay attention to steering feel and clearance during turns. Any sign of contact or vibration deserves immediate inspection before normal road use continues.
How often should tires on a 2013 Infiniti Trucks FX37 be inspected?
Tires on a 2013 Infiniti Trucks FX37 should be inspected regularly, not just when replacement time arrives. Because this vehicle can wear either 18-inch or 20-inch wheel-and-tire packages, routine checks help confirm that the tires remain properly matched, properly inflated, and free from developing damage.
A practical habit is to look over the tires before longer drives and any time ride quality or steering behavior changes. Watch for cracking, bulges, cuts, uneven wear, and gradual air loss. Vehicles that sit for stretches still need attention, since age and storage conditions can affect tire condition even when tread depth appears acceptable.
