2018 GMC Acadia: Tire Sizes, Pressures, & Wheel Specs

Quick Answer

• OEM Tire Size: 235/65R17, 235/60R18, 235/55R20
• Recommended Cold Tire Pressure (Door Placard): 35 PSI (all trims, front and rear)
• Bolt Pattern: 5x120mm
• Wheel Size: 17x7.5J, 18x7.5J, 20x8J
• Load Index/Speed Rating: 104H (for 235/65R17), 103H (for 235/60R18), 102H (for 235/55R20)
• Spare Tire Size: T165/90D18 (compact spare)
• TPMS Frequency: 315 MHz

Tire Sizes by Trim

The 2018 GMC Acadia offers a range of tire and wheel options depending on the trim level:

Note: Wheel offset typically ranges from +35mm to +40mm, but always verify with your specific wheel manufacturer.

Recommended Replacement Tires

When it's time to replace the tires on your 2018 GMC Acadia, you have many excellent options across various price points. Here are a few popular choices:

• Michelin Defender LTX M/S (Premium Tier): Known for its exceptional longevity, all-season traction, and a quiet, comfortable ride. This is a top-tier option for drivers who prioritize performance and durability. Expect to pay around $200-$250+ per tire.

• Continental CrossContact LX25 (Mid-Range Tier): A great balance of all-season performance, comfort, and tread life. It offers confident handling in wet and dry conditions and is a popular choice for SUVs. These typically range from $160-$200 per tire.

• Firestone Destination LE3 (Value Tier): An affordable yet reliable all-season tire that delivers good performance in various conditions and a comfortable ride. This is a solid option for budget-conscious owners. Prices usually fall between $130-$170 per tire.

When to Inflate to Max Load PSI

The 2018 GMC Acadia is a mid-size SUV and not considered a heavy-duty truck. Therefore, you should never inflate your tires to the "max load" PSI listed on the tire's sidewall for everyday driving. The max load PSI is a maximum engineering pressure for the tire itself, not a recommended operating pressure for your vehicle. Always follow the recommended cold tire inflation pressure found on your vehicle's door placard (35 PSI for the 2018 GMC Acadia).

Over-inflating your tires can lead to premature wear, reduced traction, a harsher ride, and an increased risk of tire damage.

Lug Nut Torque & Pattern

Properly torquing your lug nuts is crucial for safety. For the 2018 GMC Acadia, the lug nut torque specification is 140 lb-ft (190 Nm). Always use a torque wrench to ensure accurate tightening. When reinstalling a wheel, follow a star or crisscross pattern to ensure even seating of the wheel against the hub. This helps prevent warping of the brake rotors and ensures the wheel is securely attached.

Common Tire Issues for This Vehicle

Owners of the 2018 GMC Acadia generally report good tire life when proper maintenance is followed. However, some common issues or considerations can arise:

• Uneven Tire Wear: Misalignment, improper tire pressure, or worn suspension components can lead to uneven tire wear patterns (e.g., feathering, cupping, or wear on one edge). Regular tire rotations (every 5,000-7,500 miles) and alignments are key to preventing this.

• Road Noise: As tires wear or if opting for more aggressive tread patterns, increased road noise can become noticeable. Premium tires often offer better noise dampening.

• Hydroplaning Resistance: While most OEM and recommended replacement tires offer good wet traction, worn-out tires with shallow tread depths will be more susceptible to hydroplaning in heavy rain. Regularly check tread depth.

• TPMS Sensor Malfunctions: The Tire Pressure Monitoring System (TPMS) sensors can sometimes fail due to battery depletion (they typically last 5-10 years) or physical damage. If your TPMS light comes on and your tire pressures are correct, a sensor may need replacement. The 2018 Acadia uses 315 MHz sensors.

Regular tire inspections, maintaining correct tire pressure, and proper rotation are the best ways to maximize tire life and ensure safe driving for your 2018 GMC Acadia.

Need new tires? Find a trusted shop on Repairius.