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There has many different sizes to choose for helmet, but most of scooter rider would choose the open face helmet.
If there are one rider and one passenger, then we need two helmets.But for general scooter trunks, they can't contain two open face helmets or there doesn't have enough place to contain the stuff.
National Taipei University of Educa
Chih, Tang/Lee Chia, Yun/Chan