Aluminum and carbon fibers are the two most used materials for bicycle frames.
You can also pull most foldable bikes on their rear wheels when they are in their compacted form.
Folding bicycles are typically not as stylish or easy to repair as road bikes, and depending on your budget may lack some features you would normally find on a traditional bike.
When you look at the Brompton H6R Folding Bike, the first thing that comes to mind with this bike, is versatility.
But even with that, it weighs only 38 pounds.
Also, it yields higher returns on your investments.