Semi-trucks are sometimes called other names, including big rig, semis, or 18-wheelers, and for the last moniker, this is because of the combined number of wheels of both the tractor and the trailer.

The three wheels will revolve in the same time, and the small one will not slide. The circumference of each large wheel is 6X3'14159 =18-84954, that of the small wheel is 3X3' 14159=9.42477.

Ever noticed trucks cruising with some wheels floating above the pavement and wondered why not all tires are grounded? This intriguing phenomenon is due to lift axles—specialized truck ...

The proposed Fever system, which stands for Forty-Eight Volt Electrified Rear-axle, adds an electric motor to the rear axle of a small car. This creates a "through-the-road" hybrid system, in ...

Thinking beyond passenger EVs, Hyundai and Kia say that the Uni Wheel's articulation and ability to scale down to small wheel sizes could enable a mobility chair or multi-wheeled robot to climb ...

And finally, parts would have been added to the end of the axles for attaching independent wheels. The authors estimate that these innovations likely took place over 500 years.