2019 Peterbilt 389 Tire Size, Pressure & Wheel Specs

When you are dealing with a Class 8 heavy-duty legend like the 2019 Peterbilt 389, tires are more than just rubber—they are a massive part of your operating cost, safety, and ride comfort. Whether you are hauling heavy equipment on a flatbed or pulling a dry van across the country, running the correct tire sizes, load ratings, and pressures is critical to preventing blowouts and maximizing casing life for retreading.

Below is the comprehensive tire, pressure, and wheel spec guide for the 2019 Peterbilt 389.

Quick answer

• OEM tire size: 11R22.5 or 11R24.5 (Steer and Drive), depending on chassis specification. Low Pro sizes like 285/75R24.5 or 295/75R22.5 are also extremely common.
• Recommended cold tire pressure (door placard): Generally 105–110 PSI for Steer tires, 95–100 PSI for Drive tires (always verify with your specific door jamb sticker and tire load chart).
• Bolt pattern: 10-lug Hub Piloted (10x285.75mm).
• Wheel size: 22.5" x 8.25" or 24.5" x 8.25" (Standard). Wide-base "Super Singles" use 22.5" x 14.0".
• Load index/speed rating: Typically 149/146 for standard 16-ply (Load Range H) or 152 for 18-ply (Load Range J). Speed ratings are typically L (75 mph) or M (81 mph).
• Spare tire size: Not equipped standard (most Class 8 trucks rely on national roadside assistance tire networks).
• TPMS frequency: 433 MHz (if equipped with Bendix SmarTire or similar commercial TPMS).

Tire sizes by axle configuration

Unlike passenger vehicles where trim levels dictate tire size, a 2019 Peterbilt 389's tires are determined by the customer's initial wheelbase, axle rating, and hauling application.

Recommended replacement tires

Selecting tires for a 389 comes down to your route profile (regional vs. long-haul vs. severe duty). Here are some of the most reliable options:

1. Michelin X Line Energy Z (Steer) / D (Drive) – Premium Tier ($600+ per tire). The industry standard for fuel efficiency and casing longevity. Excellent for long-haul highway applications.
2. Bridgestone R213 Ecopia (Steer) / M713 (Drive) – Premium Tier ($550 - $650 per tire). Exceptional tread wear and low rolling resistance. Outstanding retreadability.
3. Yokohama RY61 (Steer) / TY517 (Drive) – Mid-Tier ($400 - $500 per tire). A highly dependable, cost-effective option for regional and line-haul routes with robust sidewall protection.
4. Firestone FS591 (Steer) / FD691 (Drive) – Mid-Tier ($350 - $450 per tire). Great value with strong performance in variable weather, backed by the Bridgestone commercial network.

When to inflate to max load psi

As a Class 8 heavy-duty truck, the 2019 Peterbilt 389 operates under massive weight fluctuations. The max cold pressure listed on the tire sidewall (typically 120 PSI for Load Range H or J) should be utilized when you are operating at the maximum rated axle weight (e.g., 12,000 to 13,200 lbs on the steer axle, or 34,000 lbs on tandem drives).

If you are hauling maximum legal gross weight (80,000 lbs GVWR) or running heavy-haul permitted loads, inflating your steer tires to 110-115 PSI and drives to 100-105 PSI is standard practice to prevent excessive sidewall flex and heat buildup. Always refer to your tire manufacturer's specific load/inflation tables, as overinflating an empty truck can lead to a harsh ride and premature center-tread wear.

Lug nut torque & pattern

• Lug Pattern: 10-lug, hub-piloted (10 x 285.75mm)
• Lug Nut Size: 33mm hex
• Torque Specification: 450–500 ft-lbs
• Torque Sequence: Always use a crisscross (star) pattern. Snug to 50 ft-lbs, then tighten to 450-500 ft-lbs. Crucial: Re-torque all lug nuts after the first 50 to 100 miles of driving following a wheel installation.

Common tire issues for this vehicle

• Rivering / Edge Wear on Steers: Long, straight highway miles can cause "rivering" (erosion-like wear along the ribs). Ensure shocks are in good condition and toe-in alignment is perfectly set.
• Cupping on Drive Tires: Usually caused by worn shock absorbers, loose U-bolts, or mismatched tire pressures in a dual assembly. Always ensure duals are matched within 1/4 inch of circumference and have identical PSI.
• Bead Damage during Mounting: Heavy-duty 22.5 and 24.5 tires require proper lubrication and tooling during mounting. Bead damage will ruin a tire's ability to be retreaded and can cause slow leaks.

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