6×4

A 6×4 or six-by-four is a vehicle with three axles, with a drivetrain delivering power to two wheel ends on two of them.[1] It is a form of four-wheel drive[2] but not one of all-wheel drive.

Typical American 6×4 tractor unit

It is the most common form of drivetrain of semi-tractors[2] and heavy haul fixed-chassis cargo trucks in larger countries such as the United States and Australia; in Europe, 4×2 and 6×2 variants are more commonplace.

See also

References
  1. International ProStar ES Class 8 truck: Axle configurations
  2. NACFE (North American Council for Freight Efficiency) Executive Report – 6x2 (Dead Axle) Tractors Archived 2015-07-07 at the Wayback Machine "A typical three axle Class 8 tractor today is equipped with two rear drive axles (“live” tandem) and is commonly referred to as a 6 X 4 configuration meaning that it has four-wheel drive capability."
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