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2. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   A swivel caster. A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment.

3. Wheel sizing - Wikipedia

   en.wikipedia.org/wiki/Wheel_sizing

   The wheel size is the size designation of a wheel given by its diameter, width, and offset. The diameter of the wheel is the diameter of the cylindrical surface on which the tire bead rides. The width is the inside distance between the bead seat faces. The offset is the distance from the wheel's true centerline (half the width) to the wheel's ...

4. Bullock cart - Wikipedia

   en.wikipedia.org/wiki/Bullock_cart

   Bullock cart. A bullock cart or ox cart (sometimes called a bullock carriage when carrying people in particular) is a two-wheeled or four-wheeled vehicle pulled by oxen. It is a means of transportation used since ancient times in many parts of the world. They are still used today where modern vehicles are too expensive or less suitable for the ...

5. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   According to Dupuit (1837), rolling resistance (of wheeled carriages with wooden wheels with iron tires) is approximately inversely proportional to the square root of wheel diameter. [34] This rule has been experimentally verified for cast iron wheels (8″ - 24″ diameter) on steel rail [35] and for 19th century carriage wheels. [33]

6. Horse-drawn vehicle - Wikipedia

   en.wikipedia.org/wiki/Horse-drawn_vehicle

   A two-wheeled horse-drawn vehicle is a cart (see various types below, both for carrying people and for goods). Four-wheeled vehicles have many names – one for heavy loads is most commonly called a wagon. Very light carts and wagons can also be pulled by donkeys (much smaller than horses), ponies or mules. Other smaller animals are ...

7. Wheelset (rail transport) - Wikipedia

   en.wikipedia.org/wiki/Wheelset_(rail_transport)

   A rail vehicle wheelset, comprising two wheels mounted rigidly on an axle. A wheelset is a pair of railroad vehicle wheels mounted rigidly on an axle allowing both wheels to rotate together. Wheelsets are often mounted in a bogie ("truck" in North America) – a pivoted frame assembly holding at least two wheelsets – at each end of the vehicle.