US$ 28.87
1980s motorcycle helmets BAUTI Retro Japanese FRP Open-face Helmet Vintage 3/4 Jet Motorbike Helmet Small Helmet Body Design DOT Certified Men's and Women's Riding Mopeds Scooters B,L=(56-57CM) : Automotive Arai GPV-R Helmet (SA2025) Color:Floater Black urbanedit
Arai GPV-R Helmet (SA2025) White / L
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urbanedit
Color:Floater Black
Also, I don't have any data about the efficiency of this kind of drive system but pushing the bicycles from behind isn’t sound like such a good idea from an efficiency perspective
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