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2. Federal Bridge Gross Weight Formula - Wikipedia

   en.wikipedia.org/wiki/Federal_Bridge_Gross...

   A tandem axle is defined as two or more consecutive axles whose centers are spaced more than 40 inches (102 cm) but not more than 96 inches (244 cm) apart. [10] Axles spaced less than 40 inches (102 cm) apart are considered a single axle. [11] In effect, the formula reduces the legal weight limit for shorter trucks with fewer axles (see table below

3. Bogie - Wikipedia

   en.wikipedia.org/wiki/Bogie

   At least one wheelset, composed of an axle with bearings and a wheel at each end. The bolster, the main crossmember, connected to the bogie frame through the secondary suspension. The railway car is supported at the pivot point on the bolster. Axle box suspensions absorb shocks between the axle bearings and the bogie frame.

4. File:Conventional 18-wheeler truck diagram.svg - Wikipedia

   en.wikipedia.org/wiki/File:Conventional_18...

   English: Diagram showing a side view and underside of a conventional 18-wheeler semi-trailer truck with an enclosed cargo space. The underside view shows the arrangement of the 18 tires (wheels). Shown in blue in the underside view are the axles, drive shaft, and differentials. The legend for labeled parts of the truck is as follows: tractor unit

5. Torsion bar suspension - Wikipedia

   en.wikipedia.org/wiki/Torsion_bar_suspension

   Torsion bar suspension inside Leopard 2 Schematic of a front axle highlighted to show torsion bar. A torsion bar suspension, also known as a torsion spring suspension, is any vehicle suspension that uses a torsion bar as its main weight-bearing spring. One end of a long metal bar is attached firmly to the vehicle chassis; the opposite end ...

6. Trailing-arm suspension - Wikipedia

   en.wikipedia.org/wiki/Trailing-arm_suspension

   A trailing-arm suspension, also referred to as trailing-link, is a form of vehicle suspension. In a motor vehicle it places one or more horizontal arms (or "links") perpendicular to and forward of the axle on the chassis or unibody, which are connected to the axle or wheels with pivot joint(s). These are typically used on the rear axle or ...

7. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   In Europe, usually only the driven tractor axle has dual wheels, while single wheels are used for every other axle on the tractor and the trailer. The most common combination used in Europe is a semi tractor with two axles and a cargo trailer with three axles, one of which is sometimes a lift axle, giving 5 axles and 12 wheels in total. This ...