2018 Chevrolet Silverado 3500HD Tire Size & Pressure Guide

When it comes to maintaining a heavy-duty workhorse like the 2018 Chevrolet Silverado 3500HD, ensuring proper tire maintenance is critical for safety, towing capacity, and vehicle longevity. Whether you are hauling massive gooseneck trailers, loading the bed with construction materials, or simply driving on the highway, your tires are the only thing keeping your rig on the road.

Below is a comprehensive guide to the tire sizes, pressures, and wheel specifications for the 2018 Chevy Silverado 3500HD.

Quick answer

• OEM Tire Size: LT235/80R17 (Dual Rear Wheel / DRW), LT265/70R18 or LT265/60R20 (Single Rear Wheel / SRW)
• Recommended Cold Tire Pressure: Front 60–65 PSI / Rear 65–80 PSI (always check your driver’s side door placard, as pressures vary significantly between SRW and DRW configurations)
• Bolt Pattern: 8x210 mm
• Wheel Size: 17x6.5 (DRW), 18x8.0 or 20x8.5 (SRW)
• Load Index / Speed Rating: 120/117 R (DRW), 123/120 R (SRW) – Load Range E (10-ply) required
• Spare Tire Size: Full-size matching spare
• TPMS Frequency: 315 MHz

Tire sizes by trim

The exact tire equipped on your 2018 Silverado 3500HD depends on whether it is a Single Rear Wheel (SRW) or Dual Rear Wheel (DRW) configuration, as well as the trim level.

Note: Always verify your specific tire size on the sidewall before ordering replacements, especially if buying a used truck that may have aftermarket wheels.

Recommended replacement tires

Because the 3500HD is a heavy-duty truck, you must install Load Range E (10-ply) tires to safely support the weight of the vehicle and any heavy payloads. Here are some of the best replacement options:

• Michelin Defender LTX M/S (Premium) – Excellent highway ride, exceptional tread life, and great all-season traction. Best for trucks that spend most of their time on pavement or towing long distances.
• BFGoodrich All-Terrain T/A KO2 (Mid-to-High) – The gold standard for all-terrain tires. Extremely durable sidewalls, great traction in dirt and snow (3-Peak Mountain Snowflake rated), but slightly louder on the highway.
• Falken Wildpeak A/T3W (Mid-Range) – A fantastic value pick offering aggressive looks, deep tread, and excellent performance in wet and snowy conditions without breaking the bank.
• Firestone Transforce HT2 (Budget/Commercial) – A solid, heavy-duty commercial highway tire favored by fleets for its durability under heavy loads.

When to inflate to max load psi

For a heavy-duty truck like the 2018 Silverado 3500HD, tire pressure is not a "set it and forget it" spec. The cold tire pressures listed on your door placard (usually around 60 PSI front and 70-80 PSI rear for SRW models) are calculated for the truck's maximum Gross Vehicle Weight Rating (GVWR).

• Towing and Hauling: When pulling a heavy fifth-wheel or carrying maximum payload in the bed, inflate your rear tires to the maximum cold PSI listed on the door placard (often 80 PSI for SRW trucks or 65 PSI for DRW trucks) to prevent sidewall flex, heat buildup, and blowouts.
• Unloaded Driving: If the truck is completely empty, running 80 PSI in the rear can cause a harsh, jarring ride and premature center tread wear. Many drivers drop the rear pressure by 10-15 PSI when unloaded for comfort, but you must remember to air back up before attaching a heavy trailer.

Lug nut torque & pattern

• Lug Nut Torque: 140 lb-ft
• Bolt Pattern: 8x210 mm
• Thread Size: M14 x 1.5

Tech Tip: Because of the immense stress placed on HD truck wheels, it is imperative to use a calibrated torque wrench to tighten the lug nuts to exactly 140 lb-ft. Always tighten in a crisscross (star) pattern, and re-torque the lug nuts after the first 50 to 100 miles of driving following a wheel installation.

Common tire issues for this vehicle

1. Cupping and Uneven Wear: HD trucks are heavy, and the solid front axles/heavy-duty independent front suspensions can cause tires to cup if not rotated regularly. Rotate your tires every 5,000 to 7,500 miles. (Note: DRW rotation patterns require dismounting if the wheels are aluminum, as the inner steel wheels differ).
2. TPMS Sensor Failures: The 315 MHz TPMS sensors on these trucks rely on internal batteries that typically last 5 to 7 years. A 2018 model is right in the window where sensor batteries may begin to die, triggering the tire pressure light on your dash even when pressures are correct.
3. Valve Stem Leaks on DRW Models: Dually trucks use specialized high-pressure valve stems, and reaching the inner rear dual can be difficult. Debris can occasionally damage the long valve extensions.

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