Tandems
The rear axle assembly on a trailer that can be slid forward or back to distribute weight.
Definition
Tandems refer to the dual-axle assembly on a semi-trailer. Tandem position (how far forward or back they are set) affects weight distribution across axles, which must comply with federal bridge law limits (34,000 lbs on tandems, 12,000 on steer, 80,000 total). Sliding tandems forward shifts weight to the steer axle; sliding them back shifts weight to the tandems. Drivers must know how to adjust tandems to comply with state-specific weight laws.
FAQ
What does Tandems mean?
The rear axle assembly on a trailer that can be slid forward or back to distribute weight.
Why is Tandems important for truck drivers?
Understanding tandems is essential for truck drivers because it directly impacts your daily operations, pay, or compliance. Tandems refer to the dual-axle assembly on a semi-trailer. Tandem position (how far forward or back they are set) affects weight distribution across axles, which must comply with federal bridge law limits (34,000 lbs on tandems, 12,000 on steer, 80,000 total).