In countries where there is a strong bicycle culture (notably in Asia), the motorized bicycle is particularly popular; in 1996 Shanghai had 370,000 motorized bicycles. The modification of power assist gives you another pair of legs. With 250 watts of power, the hub based drive offers superb, eco-friendly oomph when you need it. Inclines and pulling heavier loads are the favourite circumstances for power assist.
The client must always check the legality of the power assist with local council authorities.