| 摘要 |
A bicycle is provided to prevent a sub driving unit from braking caused by collision with barriers by allowing the sub driving unit to rotate by an even small friction with the barriers. A bicycle includes sub driving units(6a,6b). The sub driving units are formed on front and rear wheels and include a roller driving guide, a rotation unit(9), a belt(10), and a supporting bracket(11). The roller driving guide is formed lengthwise direction of the sub driving unit. The rotation unit includes driving members. The driving members rotate along circumference of the roller driving guide. The belt is mounted around the roller driving guide simultaneously with contacting the rotation unit. The supporting bracket protects the rotation unit by covering the rotation unit.
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