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Maximum Allowable Weight for Tractor Semi-trailer

Maximum Allowable Weight for Tractor Semi-trailer

Interaxle spacing
Max. combined weight

Percentage axle limit

Axle Group Number of axles Tridem Axle Spread Number of tires Tire size Rated tire capacity Allowable axle weight Notes
Maximum Allowable Gross Weight
Minimum registered weight

  1. This function calculates the maximum allowable weights as per the Commercial Vehicle Dimension and Weight Regulation of the Traffic Safety Act. Where the information shown on this page is not in agreement with the regulation, the regulation shall prevail.

  2. This function does not take into consideration the "gross axle weight rating" (GAWR) or the "gross vehicle weight rating" (GVWR) of the vehicle. The owner/operator of the vehicle should ensure that the weight carried is within the manufacturer's rated capacity specifications.

  3. The "Rated Tire Capacity" is the rated capacity of one tire, based on either single or dual application, as stamped on the sidewall of the tire.

  4. The steering axle weight for a truck tractor is capped at 6,000 kg.

  5. When the interaxle spacing is less than the minimum specified in regulations, the combined axle weight for the combination is reduced by 500 kg for every 0.1 metre or portion thereof. This will also reduce the allowable GVW. Notwithstanding the requirements for the interaxle spacing, the trailers shall also conform to all other legal dimension requirements such as trailer wheelbase and overhang.