Rollability [while folded] was a major consideration for me in choosing my first folding bicycle. Of the different brands which did that (Dahon, Brompton, Birdy, etc), Dahon came out on top, for me. Dahon Speed is chromoly and accepts 50mm tires so, no need for suspension devices (which add to weight and cost) because steel smooths out the ride and this type of steel (same that Brompton uses) is lightweight and strong. I'm very happy with this bicycle and am looking to make it a replacement for my larger-wheeled utility and touring bicycles.