2015 GMC Sierra 1500: Tire Size, Pressure & Specs

Quick answer

• OEM Tire Size: P255/70R17, P265/70R17, P265/65R18, or P275/55R20
• Recommended Cold Tire Pressure (Placard): 35 psi (front/rear)
• Bolt Pattern: 6x139.7 mm (6x5.5 in)
• Wheel Size: 17x8.0, 18x8.5, or 20x9.0
• Load Index/Speed Rating: 110/S, 113/T, 112/S, 111/S
• Spare Tire Size: 265/70R17
• TPMS Frequency: 315 MHz

Tire Sizes by Trim Level

Recommended Replacement Tires

Choosing the right tire depends on your budget and how you use your truck. Here are a few popular and highly-rated options for the 2015 Sierra 1500:

• $$$ (Premium): Michelin Defender LTX M/S - A top-tier, all-season tire known for its exceptional tread life, quiet ride, and excellent performance in wet and dry conditions. It's a fantastic choice for daily driving and highway use.
• $$ (Mid-Range): BFGoodrich All-Terrain T/A KO2 - If you venture off-road or want a more aggressive look, the KO2 is a legendary choice. It offers outstanding all-terrain traction and durability without a huge sacrifice in on-road comfort.
• $ (Budget-Friendly): General Grabber HTS60 - A solid, reliable all-season highway tire that provides good performance and a comfortable ride at a more accessible price point. It's a great value for the everyday driver.

When to Inflate to Max Load PSI

Note: This section applies primarily to Heavy Duty (HD) trucks, but the principles are relevant for the 1500. The 2015 GMC Sierra 1500 is a light-duty truck, and you should almost always stick to the 35 psi recommended on your door placard for daily driving. This pressure provides the best balance of ride comfort, handling, and tire wear.

However, if you are towing a heavy trailer or hauling a significant load in the bed that approaches your truck's maximum payload capacity, you may consider increasing the rear tire pressure. Inflating the tires closer to the maximum pressure listed on the tire's sidewall (NOT the door placard) stiffens the tire, reduces sidewall flex, and improves stability under load. Once the load is removed, you must return the pressure to the recommended 35 psi to avoid a harsh ride and premature center tread wear.

Lug Nut Torque & Pattern

• Lug Nut Torque: 140 lb-ft (190 N·m)
• Lug Pattern: When tightening the lug nuts, it's crucial to use a star or crisscross pattern to ensure the wheel is seated evenly against the hub. Tighten the nuts in two stages: first, snug them down in the star pattern, then lower the truck and torque them to the final 140 lb-ft specification in the same pattern.

Common Tire Issues for This Vehicle

• TPMS Sensor Failure: The Tire Pressure Monitoring System (TPMS) sensors on the 2015 Sierra use a 315 MHz frequency. The internal batteries in these sensors have a finite lifespan, typically 7-10 years. As these trucks age, it's common for one or more sensors to fail, causing a "Service TPMS" warning light on the dash. When replacing tires, it's often cost-effective to replace all four TPMS sensors at the same time.
• Uneven Wear Due to Alignment: Like any independent front suspension (IFS) truck, the Sierra 1500 can be prone to alignment issues, especially if used on rough roads or lifted. Misalignment is a primary cause of uneven tire wear, such as feathering or excessive wear on the inner or outer edges of the tires. Regular alignments are key to maximizing tire life.
• Vibrations from Aggressive Tires: While all-terrain or mud-terrain tires enhance off-road capability, their larger tread blocks can lead to on-road vibrations and noise, especially as they wear. Regular tire rotations (every 5,000 miles) are critical to prevent uneven wear patterns that exacerbate this issue.

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