2018 Chevrolet Suburban Tire Size & Pressure Specs

As an ASE-certified master technician, I frequently see the 2018 Chevrolet Suburban roll into the shop for routine tire replacements, alignments, and suspension work. As one of the premier full-size family haulers on the road, outfitting your Suburban with the correct tires and maintaining proper pressures is essential for safety, ride comfort, and tread life.

Here is your comprehensive tire and wheel guide for the 2018 Chevrolet Suburban.

Quick answer

• OEM Tire Size: 265/65R18 (Base), 275/55R20, or 285/45R22 depending on the trim package.
• Recommended Cold Tire Pressure: 35 PSI Front / 35 PSI Rear (check driver's side door jamb placard to confirm for your specific build).
• Bolt Pattern: 6x139.7 mm (6x5.5 inches).
• Wheel Size & Offset: 18x8.5, 20x9, or 22x9. Factory offset typically ranges from +24mm to +31mm.
• Load Index/Speed Rating: 114T (18-inch), 111S (20-inch), or 110H (22-inch).
• Spare Tire Size: 265/70R17 (Full-size spare on a steel wheel, standard for most models).
• TPMS Frequency: 433 MHz.

Tire sizes by trim

The 2018 Chevrolet Suburban was offered in LS, LT, and Premier trims, with various wheel packages including the RST (Rally Sport Truck) edition. Here is a breakdown of the factory tire sizes by trim level:

Recommended replacement tires

Because the Suburban is a heavy SUV (often weighing close to 6,000 lbs empty), you need a tire that can handle the weight while providing a quiet, comfortable ride. Here are my top picks based on durability, wet traction, and customer feedback:

• Michelin Defender LTX M/S (Premium): The gold standard for full-size SUVs. Offers exceptional tread life, quiet highway manners, and great wet/snow traction.
• Continental TerrainContact H/T (Mid-to-Premium): An excellent highway-terrain tire that provides a smooth ride and great braking performance at a slightly lower price point than the Michelin.
• Falken Wildpeak A/T3W (All-Terrain / Mid-Range): If you take your Suburban camping or deal with heavy winter snow, this all-terrain tire gives aggressive looks and severe snow rating (3PMSF) without ruining your highway ride quality.
• Cooper Discoverer HT3 (Budget-Friendly): A solid, durable highway tire that offers good performance for families looking to save a little cash without sacrificing safety.

When to inflate to max load psi

While the 2018 Chevrolet Suburban is technically a half-ton (1500) platform, it sees a lot of heavy hauling. The factory door placard recommends 35 PSI for normal daily driving. However, if you are maxing out the payload (loading up all three rows of seats plus luggage) or towing a heavy travel trailer, you should increase the rear tire pressure to stiffen the sidewall and reduce heat buildup.

For towing heavy loads, inflate the rear tires closer to 40-42 PSI (never exceeding the maximum pressure stamped on the tire sidewall, which is usually 44 or 51 PSI for standard load tires). Once you are done towing, remember to drop the pressures back down to 35 PSI to prevent a harsh ride and premature center-tread wear.

Lug nut torque & pattern

• Lug Nut Torque: 140 ft-lbs.
• Bolt Pattern: 6x139.7 mm (6x5.5")
• Lug Nut Thread Size: M14 x 1.5

Tech Tip: 140 ft-lbs is critical. Many DIYers and inexperienced shops mistakenly torque these to 100 ft-lbs. Under-torquing a heavy GM SUV can lead to wheel vibrations, warped brake rotors, and in extreme cases, a wheel coming loose. Always use a calibrated torque wrench.

Common tire issues for this vehicle

1. Outer Edge Wear: The Suburban has a high center of gravity and is a heavy vehicle. If you take corners aggressively, you will scrub the outer shoulders of the front tires very quickly. Regular rotations (every 5,000 to 7,000 miles) are mandatory to spread this wear evenly.
2. TPMS Sensor Battery Failure: Because the 2018 models are aging, the internal batteries inside the 433 MHz TPMS sensors are beginning to die. If you are buying a new set of tires, it is highly recommended to replace all four TPMS sensors at the same time to save on future labor costs.
3. 22-inch Wheel Pothole Damage: The Premier and RST models with 285/45R22 tires have very little sidewall cushion. These are highly susceptible to impact breaks (sidewall bubbles) and bent rims from potholes. Maintain exact tire pressure to give the wheel as much protection as possible.

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