During your tenure with your new folding bike, there may come an instance where you damage (even though no fault of your own) a specific part to the point where you need to replace it. Thankfully, if this happens, you can replace it (depending on what is broken) without trashing the entire back. Clearly, if the bike frame splits in half then you might as well invest in another bike. But, simple fixes such as a broken chain, rear derailleur, or a handlebar can be replaced. Wherever you buy the bike, whether online or at a local retailer, that should be your first contact point for both support and spare parts. From there, they will then contact the manufacturer to see if they can give you the replacement part that you need. In some cases, you may have to take it to a bike repair shop when you get the part.