A drive wheel is a roadwheel in an automotive vehicle that receives torque from the powertrain, and provides the final driving force for a vehicle. A two-wheel drive vehicle has two driven wheels, and a four-wheel drive has four, and so-on.
A place or thing that forms the effective center of an activity, region, or network
(hub) a center of activity or interest or commerce or transportation; a focal point around which events revolve; "the playground is the hub of parental supervision"; "the airport is the economic hub of the area"
The central part of a wheel, rotating on or with the axle, and from which the spokes radiate
(hub) the central part of a car wheel (or fan or propeller etc) through which the shaft or axle passes
The Hot Rod Patrol are a team of four Autobot Micromasters in the Transformers universes. Its members include Big Daddy, Greaser, Hubs and Trip-Up.
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Home made trailer, made from recycled parts (freecycled kids bike wheels, hubs from old wheelchair, offcut of ply from work, etc) and a second hand Carry Freedom towing arm, supplied by CF direct from part of their trailers made for the Post Office. Blatant copy of the real thing!(Carry Freedom small trailer).
Missing a Wheel
I saw this a rest stop and couldn't believe it. What you see here is a full sized, double trailer, 18-wheeler that is missing a wheel on the rear trailer. The driver decided to keep driving and chained up the suspension. Luckily he was pulled over.