I just lock, but Berwick is a reasonably safe town. I haven't folded it much, and so far have not had occasion to take it with me that way. Maybe later on a bus trip, because though our local transit buses have front-end racks for bikes, they don't fit 16" models. A very few times I've folded it to take it into a store to get out of the rain, but not as a general rule. In the beginning I thought I should fold it whenever parking, to help prevent theft, but soon thereafter I didn't bother. I doubt folding adds to wear and tear, unless that peculiar little yellow plastic cylindrical clamp-joint becomes overtaxed.