Folding bikes are a great way to get around. They’re not as fast or slick as a full-size bike but they make up for this because they’re more versatile, and less likely to be stolen (you can take them indoors and up a flight of stairs more easily). You can take them on public transport – handy if your commute requires a train but could benefit from a ride to and from the station, say.
Most bikes have either 16-inch or 20-inch wheels. Smaller makes for a handier carry, larger for a faster ride. Some fold-ups are much lighter than others, with lightness adding to the price.
Try before you buy and note that a folding bike can feel less stable than regular bikes because of the smaller wheels. Remember you’ll be carrying it as well as riding it so try holding it folded as well. Models here range from 9.9kg (very light) to 16kg (don’t carry upstairs if you can help it).