2019 GMC Sierra 1500 — Tire Size & Pressure Specs

As an ASE-certified master technician, I’ve serviced countless half-ton trucks, and the 2019 GMC Sierra 1500 is a frequent visitor to the bay. Getting your tire specifications right is crucial for maintaining the Sierra’s ride quality, towing capability, and overall safety. Below is a comprehensive guide to the tire sizes, pressures, and wheel specs for the 2019 GMC Sierra 1500.

Quick answer: 2019 GMC Sierra 1500 Tire Specs

Before you head to the tire shop, here are the essential specs you need to know for the 2019 GMC Sierra 1500:

• OEM Tire Size: 255/70R17, 265/65R18, 275/65R18, 275/60R20, or 275/50R22 (depending on trim)
• Recommended Cold Tire Pressure: 35 PSI Front / 35 PSI Rear (Check your driver's side door placard for exact numbers based on your specific build)
• Bolt Pattern: 6x139.7 mm (6x5.5")
• Wheel Size: 17x8.0" to 22x9.0" (Offsets typically range from +24mm to +28mm)
• Load Index / Speed Rating: Typically 112T to 116T (Standard) / 115T or 116S (All-Terrain)
• Spare Tire Size: 255/80R17 or 265/70R17 (Full-size spare on most trims)
• TPMS Frequency: 433 MHz

Tire sizes by trim

The 2019 GMC Sierra 1500 was completely redesigned for this model year, offering a variety of trims from the basic work truck to the luxurious Denali. Tire sizes vary significantly across these models.

Recommended replacement tires

When replacing tires on your Sierra 1500, you need rubber that matches your driving habits—whether that's highway commuting, job-site hauling, or off-roading. Here are my top picks:

1. Michelin Defender LTX M/S (Premium / Highway) The gold standard for light trucks. Incredible tread life, quiet highway ride, and excellent wet traction. Perfect if you stay on the pavement.
2. BFGoodrich All-Terrain T/A KO2 (Premium / All-Terrain) If you drive an AT4 or frequently hit dirt roads, this is a top-tier choice. Severe snow rated (3PMSF) and extremely durable sidewalls.
3. Falken Wildpeak A/T3W (Mid-Range / All-Terrain) An excellent alternative to the BFG with fantastic wet-weather performance and aggressive styling at a slightly lower price point.
4. Cooper Discoverer HT3 (Budget-Friendly / Highway) A solid, reliable highway terrain tire that won't break the bank. Great for the daily driver or standard work truck.

When to inflate to max load psi

Note: While the "max load PSI" rules generally apply strictly to Heavy Duty (2500/3500) trucks running E-load tires at 80 PSI, half-ton owners still need to be aware of load management.

For the Sierra 1500, standard load (SL) tires usually max out at 44 or 51 PSI. While the door placard recommends 35 PSI for everyday driving, if you are towing a heavy trailer near your max capacity or hauling a bed full of gravel, you should inflate your rear tires closer to 40-42 PSI (without exceeding the max PSI printed on the tire sidewall). This stiffens the sidewall, reduces sway, and prevents the tire from overheating under heavy loads. Always drop the pressure back to 35 PSI once the load is removed to prevent uneven center tread wear.

Lug nut torque & pattern

Proper wheel installation is critical. Uneven torque can warp your brake rotors or lead to a wheel-off situation.

• Bolt Pattern: 6x139.7 mm (also known as 6x5.5 inches)
• Lug Nut Torque: 140 lb-ft (190 Nm)
• Thread Size: M14 x 1.5

Tech Tip: Always use a calibrated torque wrench. Do not rely on an impact gun alone. Torque the nuts in a star/cross pattern, and re-check the torque after 50-100 miles of driving after a wheel has been removed.

Common tire issues for this vehicle

In the shop, we see a few recurring tire-related themes with the 2019 Sierra 1500:

• Outer Edge Wear on Front Tires: The independent front suspension on these trucks can chew through the outer shoulders of the tires if the toe alignment is out of spec, or if corners are taken too aggressively. Regular rotations (every 5,000-7,500 miles) and annual alignments are a must.
• TPMS Sensor Failures: The 433 MHz sensors on GM trucks are generally reliable, but after 5-6 years, the internal batteries begin to die. If your 2019 is showing a TPMS fault, it might be time for a new set of sensors.
• Cupping on Off-Road Tires: Owners of the AT4 running aggressive mud-terrain or hybrid tires often experience tire cupping and loud highway noise if they neglect their rotation schedule. Cross-rotating is essential for these aggressive tread patterns.

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