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What do you mean by the upper and lower limits of bicycles?
The handlebar of the bicycle is connected with the frame head pipe at the top of the front fork of the bicycle for limiting.

Driving, also known as cycling or cycling, is usually a small land vehicle with two wheels. After people get on the bus, pedal is the driving force, which is a kind of green transportation and can be used as an environmentally friendly transportation instead of walking. More and more people use bicycles as fitness equipment for riding and cycling.