Buying a folding bike so I could commute on the train has been one of the best decisions I have made in recent years - in terms of both lifestyle and carbon.

Computer simulations that take all of these factors into account could lead to improved designs for folding bikes with small wheels or bikes that carry cargo, Ruina says.

Grasshopper is a foldable electric bicycle that turns into a trolley for easy transport. The use of composite materials provides rigidity and strength.