The ONEBOT S2 folding electric bike is currently crowdfunding on Indiegogo. The bicycle has a magnesium-alloy frame and weighs 39 lbs (~18 kg). A 250 W motor allows you to accelerate from 0 to 16 mph (~25 kph) in 3.2 seconds, with up to 35 Nm of torque. Plus, a 216 Wh battery delivers up to 31 miles (~50 km) of range.