2022 Kenworth T680 Tire Size, Pressure, & Wheel Specs

As an ASE-certified master technician, I know that maintaining the proper tires on a Class 8 heavy-duty truck like the 2022 Kenworth T680 is critical for fuel efficiency, safety, and minimizing downtime. Because the T680 is a highly customizable commercial semi-truck, its tire specifications depend heavily on the gross axle weight rating (GAWR) and the fleet’s specific application (linehaul, regional, or heavy haul).

Below is your comprehensive guide to the wheel and tire specifications for the 2022 Kenworth T680.

Quick answer: 2022 Kenworth T680 Tire & Wheel Specs

• OEM tire size: 295/75R22.5 or 11R22.5 (standard linehaul); 275/80R22.5 or 11R24.5 (optional/heavy application)
• Recommended cold tire pressure (door placard): 100–110 PSI (Steer axle) / 95–100 PSI (Drive axles). Always verify against your specific door jamb placard and load.
• Bolt pattern: 10-lug, 10x285.75mm (Hub-piloted)
• Wheel size: 22.5" x 8.25" (standard); 24.5" x 8.25" (optional)
• Load index/speed rating: Load Range G (14-ply) or Load Range H (16-ply) / Speed rating L (75 mph) or M (81 mph)
• Spare tire size: Commercial trucks typically do not carry a spare; if equipped, it is a matching full-size steer or drive tire.
• TPMS frequency: Integrated systems (like Bendix SmarTire) typically operate on 433 MHz.

Tire sizes by application

While passenger cars have "trims," commercial trucks like the T680 have different axle ratings and applications. Here are the most common configurations rolling out of the Kenworth plant:

Recommended replacement tires

When replacing tires on a commercial rig, rolling resistance (fuel economy), tread life, and retreadability are key. Here are top choices for the T680:

• Michelin X Line Energy Z (Steer) / D (Drive) – Premium Tier The gold standard for linehaul fuel efficiency. Outstanding mileage and casing durability for multiple retreads.
• Bridgestone R213 Ecopia (Steer) – Premium Tier Offers intelligent tread design that combats irregular wear, making it excellent for long-haul T680s.
• Goodyear Endurance LHS (Steer) / LHD (Drive) – Mid-to-Premium Tier A very popular fleet choice balancing long miles to removal and excellent wet traction.
• Yokohama 114R (Steer/Trailer) – Value/Mid-Tier A great cost-effective option offering SmartWay verification and a strong casing.

When to inflate to max load psi

Because the Kenworth T680 is a Class 8 heavy-duty truck, proper inflation based on axle load is non-negotiable.

You should inflate your steer tires to their max load PSI (often 110 or 120 PSI for Load Range H tires) when your steer axle is loaded to its maximum GAWR (commonly 12,000 to 13,200 lbs). If you are running an empty trailer or light loads, running max PSI on the drive axles can cause center-tread wear and a harsh ride. Fleet managers should consult their tire manufacturer's specific load/inflation tables to match cold tire pressure to actual scale weights.

Note: Never exceed the maximum cold inflation pressure stamped on the tire sidewall or the maximum pressure rating of the wheel.

Lug nut torque & pattern

Almost all modern Class 8 trucks use a hub-piloted wheel mounting system.

• Bolt Pattern: 10-lug (10x285.75mm)
• Hardware: Two-piece flange nuts (33mm hex is standard)
• Torque Spec: 450 to 500 ft-lbs.
• Torque Sequence: Always use a star (crisscross) pattern. Use a calibrated heavy-duty torque wrench, never an impact gun alone. Wheels should be re-torqued after the first 50 to 100 miles following removal.

Common tire issues for this vehicle

1. Steer Tire Irregular Wear (River Wear): Aerodynamic trucks like the T680 put unique stresses on steer tires. Without exact alignment (toe and caster) and strict air pressure maintenance, steer tires are prone to edge or "river" wear.
2. Drive Tire Heel/Toe Wear: Often caused by mismatched dual tire diameters, incorrect inflation, or worn suspension components (such as shocks or torque rods). Always ensure duals are matched within 1/4-inch in circumference.
3. TPMS Sensor Damage: Commercial TPMS sensors are often banded inside the wheel. Inexperienced tire technicians can easily break these sensors during dismounting.

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