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This is it, you now have no excuse. Go convert your bicycle right now.
>https://www.youtube.com/watch?v=puY9XM041S8
>50 mph reached on flat ground using an angle grinder and some recycled cellphone batteries
>https://www.youtube.com/watch?v=puY9XM041S8
>50 mph reached on flat ground using an angle grinder and some recycled cellphone batteries