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2. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   This number will vary depending on the number of lugs, the PCD, the material used and the type of axle the wheel is used on. A wheel used on a free rolling trailer axle will carry more weight than that same wheel used on the drive or steering axle of a vehicle. All wheels will have the load capacity stamped on the back of the wheel.

3. Rim (wheel) - Wikipedia

   en.wikipedia.org/wiki/Rim_(wheel)

   On a bicycle wheel, the rim is clearly just one component of the assembly, and it can be purchased separately and replaced if damaged or if the sidewalls have been eroded by rim brakes. [17] In discussions of automobiles, however, the terms wheel and rim are often incorrectly used synonymously, as in decorative wheels being called rims. One ...

4. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel. Fifth wheels were originally not a complete circle and were hand forged.

5. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...

6. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   Many semi-trailers have wheels that are capable of being totally dismounted and are also relocatable [6] (repositionable) to better distribute load to bearing wheel weight factors. [7] Semi-trailers are more popular for transport than full trailers, which have both front and rear axles. Ease of backing is cited as one of the semi's chief ...

7. Trailer (vehicle) - Wikipedia

   en.wikipedia.org/wiki/Trailer_(vehicle)

   A fifth-wheel coupling is also referred to as a kingpin hitch and is a smaller version of the semi-trailer "fifth wheel". Though a fifth wheel and a gooseneck trailer look much the same, their method for coupling is different. A fifth wheel uses a large horseshoe-shaped coupling device mounted 1 foot (0.30 m) or more above the bed of the tow ...