2017 Kenworth T680 Tire Size, Pressure & Wheel Specs

The 2017 Kenworth T680 is a flagship Class 8 commercial truck designed for long-haul aerodynamics, fuel efficiency, and driver comfort. Because heavy-duty trucks are highly customizable for specific fleet operations, tire specifications can vary based on axle configurations and weight ratings. However, standard line-haul setups share common tire and wheel specifications. Here is your comprehensive guide to the tire size, pressure, and wheel specs for the 2017 Kenworth T680.

Quick answer

• OEM Tire Size: 295/75R22.5 or 11R22.5 (Standard Steer and Drive axles)
• Recommended Cold Tire Pressure: Steer: 105–110 PSI / Drive: 95–100 PSI (Check door jamb placard for exact fleet spec)
• Bolt Pattern: 10-lug hub-piloted (10x285.75mm)
• Wheel Size: 22.5" x 8.25" or 24.5" x 8.25"
• Load Index / Speed Rating: 144/141 (Load Range G) or 149/146 (Load Range H) / Speed Rating L or M
• Spare Tire Size: Matches Steer/Drive (if equipped; many modern fleets do not carry on-board spares to save weight)
• TPMS Frequency: 433 MHz (often equipped with Bendix SmarTire or similar commercial systems)

Tire sizes by axle/configuration

Since commercial trucks are ordered à la carte, "trim levels" are replaced by axle configurations and duty cycles. Below are the most common tire sizes found on a 2017 T680.

Recommended replacement tires

When outfitting a Class 8 long-haul truck, fuel efficiency (Low Rolling Resistance), casing durability for retreading, and all-weather traction are paramount.

1. Michelin X Line Energy Z (Steer) / D (Drive) – Premium Tier The gold standard for line-haul operations. These offer exceptional fuel economy, even wear, and highly retreadable casings.
2. Bridgestone R213 Ecopia (Steer) / G312 (Drive) – Premium Tier Known for excellent tread life and directional stability on the highway, making long stints in the T680 comfortable and safe.
3. Yokohama RY611 (Steer) / TY517 (Drive) – Mid-Tier A fantastic balance of price and performance, offering reliable traction, good casing integrity, and solid wet weather performance.
4. Continental EcoPlus HS3+ / HD3+ – Mid-Tier Engineered for low rolling resistance and high mileage, these are increasingly popular with efficiency-minded fleets.

When to inflate to max load psi

For a heavy-duty Class 8 truck like the 2017 Kenworth T680, tire pressure management is critical for safety, fuel economy, and tire lifespan.

You should inflate your tires to the maximum PSI listed on the tire sidewall (typically 110–120 PSI for Load Range H) only when your steer axle or drive axle is loaded to its maximum Gross Axle Weight Rating (GAWR).

• Steer Axles: Often run closer to max PSI (105-115 PSI) because the engine weight and cab load remain relatively constant.
• Drive Axles: Should be adjusted based on the load. If you are hauling a fully loaded trailer near the 80,000 lb GCWR limit, drive tires need 100-110 PSI. If you are running bobtail or with a light load for an extended period, running max pressure will cause rapid center-tread wear and a harsh ride.
• Pro Tip: Always refer to the tire manufacturer's specific load/inflation tables for your exact tire model to match PSI to your actual scaled axle weights.

Lug nut torque & pattern

Proper wheel torque is arguably the most vital safety check on a commercial vehicle.

• Bolt Pattern: 10-lug, hub-piloted (10x285.75mm)
• Lug Nut Size: 33mm hex (standard for 22.5" and 24.5" hub-piloted wheels)
• Torque Spec: 450 – 500 ft-lbs
• Torque Sequence: Always use a standard 10-lug star/crisscross pattern.
• Note: Hub-piloted wheels require two drops of motor oil on the threads and the built-in washer before installation. Never lubricate the mating surface of the wheel or brake drum. Re-torque wheels after 50 to 100 miles of driving following a tire change.

Common tire issues for this vehicle

1. River Wear / Edge Wear on Steer Tires: The T680's aerodynamic stance and suspension geometry can sometimes lead to localized edge wear (river wear) on steer tires if alignment (caster/camber) is slightly off or if shocks are worn.
2. Irregular Drive Tire Wear: Due to the massive torque of the PACCAR MX-13 or Cummins ISX15 engines, spinning the tires in wet or snowy conditions can cause heel-and-toe wear on the drive tires.
3. Underinflation Blowouts: Inside dual tires are notorious for going unchecked. An underinflated inside dual will overheat quickly at highway speeds, leading to catastrophic casing failure and potentially damaging the truck's airbags and mudflap brackets. Always use a calibrated gauge or a reliable TPMS.

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