The 2013 Infiniti G37x requires specific wheel dimensions to maintain its performance and safety, most notably a 5x114.3mm bolt pattern, a 66.1mm center bore, and offsets ranging from +35mm to +45mm. Because the "x" designation signifies the Intelligent All-Wheel Drive (AWD) system, owners must prioritize a "square" setup—identical wheel and tire sizes on all four corners—to prevent mechanical damage to the transfer case.
As we move through 2026, the 2013 Infiniti G37x remains a staple in the enthusiast community. Whether you are looking to replace a damaged factory rim or upgrade to an aftermarket set to enhance the vehicle’s "sport-luxury" aesthetic, understanding the technical nuances of the G37x wheel architecture is essential. This guide provides an exhaustive overview of OEM specifications, the critical requirements of the AWD system, and the best practices for selecting new rims.
Understanding the 2013 Infiniti G37x Wheel Architecture
The 2013 Infiniti G37x occupies a unique position in the V36 platform's history. As the final year before the model was rebranded as the Q50 (with the G sedan briefly continuing as the Q40), the 2013 G37x features refined suspension tuning and brake configurations that dictate wheel compatibility.
Unlike the Rear-Wheel Drive (RWD) Sport models, which often featured staggered wheel setups (wider wheels in the rear), the G37x was engineered for balanced traction. This balance is managed by the ATTESA E-TS (Advanced Total Traction Engineering System for All-Electronic Torque Split). This system is sensitive to the rotational speed of each wheel. If the front and rear wheels have different rolling diameters—even by a small margin—the system may detect "slip" that isn't actually occurring, leading to premature wear or catastrophic failure of the AWD coupling.
When selecting rims in 2026, you must ensure that the wheel width and diameter allow for a tire size that keeps the overall rolling circumference consistent across both axles.
Factory Wheel Options: 17-Inch and 18-Inch Standards
In 2013, Infiniti offered several factory rim designs for the G37x, depending on whether the vehicle was a sedan or a coupe, and which packages were selected.
The 17-Inch Base Sedan Rims
The standard rim for the G37x Sedan was a 17x7.5-inch aluminum alloy wheel. These wheels were designed for ride comfort and all-season utility. They typically featured a multi-spoke design and a silver finish. While they offer the most "cushioned" ride due to the larger tire sidewall, they are often the first items enthusiasts replace to achieve a more modern look.
The 18-Inch Sport Appearance and Coupe Rims
Many G37x models, particularly the Coupe and Sedans equipped with the Sport Appearance Package, came with 18x7.5-inch or 18x8-inch wheels. These wheels provide a better balance between aesthetics and performance. The thinner sidewall of the 18-inch tire reduces "tire squirm" during aggressive cornering, providing a more communicative steering feel.
| Specification | 17" Factory Rim (Sedan) | 18" Factory Rim (Coupe/Sport) |
|---|---|---|
| Diameter x Width | 17 x 7.5 Inches | 18 x 8.0 Inches |
| Bolt Pattern | 5 x 114.3 mm | 5 x 114.3 mm |
| Offset (ET) | +45 mm | +43 mm |
| Center Bore | 66.1 mm | 66.1 mm |
| Construction | Cast Aluminum Alloy | Cast Aluminum Alloy |
| Lug Type | Mag Seat (with washer) | Mag Seat (with washer) |
Essential Technical Specifications for Aftermarket Rims
If you are moving away from OEM Infiniti wheels, you must match several "hard" specifications to ensure the wheels physically fit onto the hub and clear the suspension components.
1. Bolt Pattern: 5x114.3mm
This is the most common bolt pattern for Japanese performance vehicles. It consists of five lug holes arranged in a circle with a diameter of 114.3mm (or 4.5 inches). Wheels from other manufacturers (like BMW’s 5x120 or Audi’s 5x112) will not fit without unsafe adapters, which are generally discouraged for the G37x platform.
2. Center Bore: 66.1mm
The center bore is the hole in the middle of the wheel that fits over the car's hub. Infiniti uses a 66.1mm hub. Most aftermarket wheels are "lug-centric," meaning they have a larger center bore (often 73.1mm) to fit various car models. If you buy wheels with a larger bore, you must use hub-centric rings to bridge the gap. This prevents high-speed vibrations and ensures the wheel is perfectly centered on the hub.
3. Offset (ET)
Offset determines how far the wheel sits inside or outside the fender. The 2013 G37x typically uses a high positive offset (+43mm to +45mm).
- Lower Offset (+30mm to +35mm): Pushes the wheel outward toward the fender, creating a "flush" look.
- Higher Offset (+45mm to +50mm): Sits deeper in the wheel well, potentially interfering with suspension struts or the brake calipers.
4. Brake Clearance (The Akebono Factor)
One of the most common mistakes owners make is forgetting about brake clearance. If your G37x has been upgraded with the "Sport" Big Brake Kit (BBK)—the silver or red four-piston Akebono calipers—many 17-inch and even some 18-inch wheels will not clear the calipers. You must look for "high disk" wheels or specific designs known to clear the G37 Sport brakes.
The AWD Factor: Why Square Setups Matter
The 2013 Infiniti G37x is fundamentally different from the G37S (Sport RWD) when it comes to wheel sizing. In a RWD G37, it is common to see 9-inch wide wheels in the front and 10.5-inch wide wheels in the rear. In the AWD G37x, this is risky.
The ATTESA E-TS system monitors the speed of the front and rear driveshafts. If the rear tires are wider or have a different profile than the fronts, their rolling diameter changes. Even a 1% difference in rolling diameter can cause the AWD computer to think the wheels are slipping, engaging the transfer case unnecessarily. This leads to:
- Overheating of the AWD fluid.
- "Limp mode" activation.
- Mechanical binding during low-speed turns.
- Long-term damage to the transfer case clutches.
Recommendation: For the G37x, stick to a Square Setup. Use the same wheel width and the same tire size on all four corners. If you must run a staggered setup for aesthetic reasons, you must use a tire size calculator to ensure the front and rear diameters are within 0.5% of each other.
Performance Impacts of Wheel Size and Weight
Upgrading your 2013 Infiniti G37x rims isn't just about looks; it significantly alters the driving dynamics.
Unsprung Weight
The factory 18-inch wheels weigh approximately 24–26 lbs each. When shopping for aftermarket rims in 2026, many owners opt for flow-formed or forged wheels. Reducing the "unsprung weight" (weight not supported by the suspension) allows the shocks and springs to react faster to road imperfections. A lighter wheel (e.g., 19–21 lbs) improves acceleration, braking distance, and steering response.
19-Inch Upgrades
The 19-inch wheel size is arguably the "sweet spot" for the G37x's proportions. It fills the wheel arches effectively without requiring extreme suspension lowering. However, 19-inch wheels require lower-profile tires (such as 245/40R19), which increases the risk of wheel damage from potholes and slightly firms up the ride quality.
20-Inch Upgrades
While 20-inch rims are popular for "show" cars, they are often considered detrimental to the G37x's performance. The extremely thin tire sidewalls required for 20-inch fitment offer very little protection for the rim and can make the ride feel harsh and "crashy" over bumps.
Maintenance and Care for Infiniti Alloy Rims
By 2026, many original 2013 G37x rims may be showing signs of age, such as clear coat peeling or curb rash. Maintaining the integrity of your rims is vital for safety.
- Corrosion Inspection: Check the inner barrel of the rim for corrosion, especially near the bead seat. If the bead seat is corroded, it can cause slow air leaks that are difficult to diagnose.
- TPMS Sensors: The 2013 G37x uses a direct Tire Pressure Monitoring System (TPMS). When switching to new rims, you must either transfer the old sensors (if the batteries are still good) or install new 315MHz sensors and have them programmed to the vehicle’s ECU.
- Cleaning Agents: Avoid using "acid-based" wheel cleaners on factory Infiniti wheels. The clear coat used on these wheels can be sensitive, and harsh chemicals may lead to whitening or spotting of the finish. Use pH-neutral cleaners and a soft microfiber brush.
Comparison of Popular Wheel Fitments for G37x
| Fitment Type | Wheel Size | Recommended Tire | Benefit |
|---|---|---|---|
| OEM Plus | 18 x 8.0" ET43 | 225/50R18 | Factory comfort, guaranteed AWD safety. |
| Daily Sport | 19 x 8.5" ET35 | 245/40R19 | Fills fenders better, improved grip. |
| Aggressive Square | 19 x 9.5" ET35 | 255/40R19 | Maximum grip, requires minor fender work. |
| Winter Setup | 17 x 7.5" ET45 | 225/55R17 | Better snow traction and pothole protection. |
Frequently Asked Questions
Can I put wheels from a Nissan 370Z on my G37x?
Yes, but with a major caveat. Most 370Z wheels are staggered (wider rears). If you want to use them on a G37x, it is highly recommended to buy four "front" wheels or four "rear" wheels to maintain a square setup. Using the staggered set as-is from a 370Z will likely trigger AWD errors unless you carefully match the tire diameters.
What is the maximum wheel width I can run without rubbing?
For a 2013 G37x sedan, a 9.5-inch wide wheel with an offset around +35mm is generally the limit for the front before you encounter rubbing against the suspension or fender liner. For the coupe, you can often go slightly wider (up to 10-inch ET40) because of the larger fender flares, though a square 9.5-inch setup remains the safest performance choice.
Do I need special lug nuts for aftermarket rims?
Yes. Factory Infiniti rims use "mag seat" lug nuts with a flat washer. Almost all aftermarket rims use a "conical" or "tapered" seat. Using your factory lug nuts on aftermarket wheels is extremely dangerous as they will not seat correctly, potentially leading to the wheel vibrating loose or falling off.
Will 17-inch rims fit if I have the Sport brakes?
Generally, no. The 355mm (14-inch) front rotors and large Akebono calipers found on the Sport models (or those who retrofitted them) usually require at least an 18-inch wheel with a specific spoke design to clear the face of the caliper.
Does changing the rim size affect my speedometer?
If you maintain the same overall tire diameter, the speedometer will remain accurate. For example, moving from a 225/50R18 to a 245/40R19 keeps the diameter within a fraction of an inch, resulting in less than a 1% speedometer error.
Final Recommendations for 2013 G37x Owners
When choosing rims for your 2013 Infiniti G37x in 2026, the priority should always be the integrity of the AWD system.
For those seeking a balance of luxury and performance, a 19x8.5-inch square setup with a +35mm offset is the most highly recommended path. This configuration provides a modern, flush appearance, allows for a wide variety of high-performance tires, and ensures the transfer case remains healthy. Always ensure your new wheels are paired with hub-centric rings (66.1mm) and the correct conical lug nuts. If you frequently drive in areas with poor road maintenance, staying with an 18-inch wheel will provide the extra tire sidewall necessary to protect your investment from structural damage.
