The big wheels take on more importance within the body design; they suggest a serious purpose. But too big and the car can look ridiculously out of proportion. Black wheels can look good at a car ...

A T the Paris World Exhibition in 1900 Ferdinand Porsche, the eponymous founder of the German sports-car company, unveiled an electric vehicle ( EV) with a radical design. Rather than a single motor ...

A mechanism is a series of moving parts, working together to do a specific job. Both the bicycle and the toy car have wheel and axle mechanisms that help them to move. So, how does this work?