Heavy-Duty TBR Tire Size Guide

Heavy-duty truck tires, specifically TBR (Truck and Bus Radial) tires, are designed for commercial vehicles such as tractor-trailers, dump trucks, and other heavy-duty applications. These tires are DOT-certified to meet U.S. Department of Transportation safety standards, ensuring compliance for highway use. The tire size numbers indicate dimensions like width, aspect ratio, construction type (radial), and rim diameter, using metric or imperial formats. Below, I’ll list common DOT-certified heavy-duty truck tire size numbers, incorporating the sizes from your previous query (11R22.5, 11R24.5, 295/75R22.5, 295/80R22.5, 315/80R22.5, 315/70R22.5, 275/70R22.5, 255/70R22.5) and additional sizes from web results, with a focus on their use for heavy-duty trucks (steer, drive, or all-position axles).

Understanding Heavy-Duty Truck Tire Size Numbers

1.  Metric Format (e.g., 295/75R22.5):

•  First number: Tire width in millimeters (e.g., 295 mm).

•  Aspect ratio: Sidewall height as a percentage of the width (e.g., 75%).

•  R: Radial construction (standard for heavy-duty TBR tires).

•  Last number: Rim diameter in inches (e.g., 22.5 inches).

2.  Imperial Format (e.g., 11R22.5):

•  First number: Nominal tire width in inches (e.g., 11 inches).

•  R: Radial construction.

•  Last number: Rim diameter in inches (e.g., 22.5 inches).

•  Older sizes may include “.00” (e.g., 10.00R20), implying a high aspect ratio (close to 100%).

3.  DOT Certification: All heavy-duty truck tires in the U.S. must have a “DOT” marking on the sidewall, confirming compliance with NHTSA safety standards. The size is part of the Tire Identification Number (TIN), which also includes manufacturing details.

Common Heavy-Duty Truck Tire Size Numbers

Below are common DOT-certified TBR tire sizes used for heavy-duty trucks, focusing on steer, drive, and all-position applications. The list includes sizes from your query and others from web results (e.g., www.tnr-international.com, www.fourdtyre.com, www.continental-tires.com).

Metric TBR Sizes

These are widely used for modern heavy-duty trucks:

•  215/75R17.5: Smaller size for light heavy-duty trucks (e.g., regional delivery).

•  235/75R17.5: Used for medium-duty trucks or lighter steer axles.

•  245/70R19.5: Common for regional trucks, often on steer or all-position axles.

•  255/70R22.5 (from your query): Narrow, low-profile, used for lighter heavy-duty applications (e.g., regional steer axles; load capacity ~4,000–5,000 lbs).

•  275/70R22.5 (from your query): Slightly wider, low-profile, used for steer or drive axles (e.g., load capacity ~5,000–6,000 lbs).

•  295/75R22.5 (from your query): Standard for long-haul trucks, used for steer or drive axles (e.g., ~6,175 lbs at 110 psi, load range G).

•  295/80R22.5 (from your query): Taller sidewall, used for heavy-duty steer or drive axles (e.g., ~6,940 lbs at 120 psi).

•  315/70R22.5 (from your query): Low-profile, wider, used for drive axles in heavy-duty trucks (e.g., ~8,000 lbs).

•  315/80R22.5 (from your query): Wider, high load capacity for heavy-duty steer or drive axles (e.g., ~9,000 lbs at 130 psi).

•  385/65R22.5: Wide-base, used for steer axles in heavy-duty trucks or occasionally trailers (e.g., ~10,200 lbs).

•  425/65R22.5: Wide-base, high load capacity for heavy-duty steer axles (e.g., ~11,400 lbs).

•  445/65R22.5: Wide-base, maximum load capacity for heavy-duty applications (e.g., ~12,300 lbs).

Imperial TBR Sizes

These are common for traditional or heavy-duty truck applications:

•  9.00R20: Tube-type, used for older heavy-duty trucks (e.g., off-road or construction).

•  10.00R20: Tube-type, common for heavy-duty drive axles (e.g., ~6,680 lbs).

•  11.00R20: Tube-type, used for heavy loads in rugged conditions.

•  12.00R20: Tube-type, for maximum load capacity in off-road trucks.

•  12.00R24: Larger rim, used for heavy-duty off-road or construction trucks.

•  10R17.5: Smaller size for regional heavy-duty trucks.

•  10R22.5: Used for medium-duty steer or drive axles.

•  11R22.5 (from your query): Standard for long-haul trucks, used for steer or drive axles (e.g., ~6,175 lbs at 105 psi, load range G).

•  11R24.5 (from your query): Taller profile, used for drive axles in heavy-duty trucks (e.g., ~6,610 lbs at 105 psi).

•  12R22.5: Wider, used for heavy-duty steer or drive axles.

•  13R22.5: Maximum width for heavy-duty applications (e.g., logging, mining trucks).

Key Characteristics and Applications

•  Load Capacity: Heavy-duty truck tires typically have high load ranges (e.g., G, H, J, L):

•  11R22.5 (Load Range G): ~6,175 lbs (single), ~5,675 lbs (dual) at 105 psi.

•  315/80R22.5 (Load Range L): ~10,000 lbs at 130 psi.

•  425/65R22.5 (Load Range L): ~11,400 lbs at 120 psi.

•  Applications:

•  Steer Axles: 295/75R22.5, 315/80R22.5, 11R22.5, and 385/65R22.5 are common for steering due to their stability and load capacity.

•  Drive Axles: 11R24.5, 315/70R22.5, and 295/80R22.5 are used for traction in long-haul or regional trucks.

•  All-Position: Sizes like 275/70R22.5 or 255/70R22.5 are versatile, used for regional trucks or lighter heavy-duty applications.

•  Wide-Base Tires: 385/65R22.5 and 425/65R22.5 (super-singles) replace dual setups for weight savings and fuel efficiency, common on steer axles for heavy-duty trucks.

•  Heavy-Duty Use Cases: These sizes are used for Class 7–8 trucks (e.g., semi-trucks, dump trucks, logging trucks), with specific sizes like 12.00R20 or 445/65R22.5 suited for off-road or extreme conditions (e.g., construction, mining).

•  DOT Compliance: The “DOT” marking ensures compliance with NHTSA standards for load, pressure, tread wear, and safety. The TIN includes the size and manufacturing date (e.g., 4025 for 40th week of 2025).

Sources for Further Details

•  Manufacturer Websites: Bridgestone (commercial.bridgestone.com), Michelin (business.michelinman.com), Goodyear (www.goodyeartrucktires.com), and Continental (www.continental-tires.com) provide size charts, often as PDFs, for DOT-certified heavy-duty truck tires.

•  Retailers: Discount Tire (www.discounttire.com), Alibaba, or Forlander (www.forlander.com) offer size guides and load range charts, sometimes downloadable.

•  Standards Organizations: The Tire and Rim Association (TRA) or ETRTO provides standardized size lists, ensuring DOT compliance.

Notes

•  Sizes from Your Query: All listed sizes (11R22.5, 11R24.5, 295/75R22.5, 295/80R22.5, 315/80R22.5, 315/70R22.5, 275/70R22.5, 255/70R22.5) are commonly used for heavy-duty trucks, particularly for steer and drive axles. For example:

•  11R22.5 and 295/75R22.5 are standard for long-haul semi-trucks.

•  315/80R22.5 is used for heavy-duty applications like dump trucks.

•  255/70R22.5 is suited for lighter heavy-duty trucks or regional use.

•  Availability: Major brands like Bridgestone, Michelin, Goodyear, and Continental, as well as budget brands like Forlander and Roadlux, offer these sizes.