We've featured many a folding bike in the past, now here's one that is said to be the smallest and lightest in the world. It's so small that you can take it on public transport with a no-bicycles policy. The A-Bike utilizes automotive grade, engineering polymers for its structural components, saddle and handlebars and has a level of stiffness, fatigue and impact resistance comparable with aero-grade aluminium. By using these new materials, the A-bike's weight has been reduced to just 5.5 kg (12 lbs). it can be folded inside 10 seconds into a compact package and has pneumatic tire.