I recent purchased and started riding to work a
Dahon Speed Pro, which has a full complement of gears. It mixes a 53-tooth chainring with a seven-speed cassette... and a three speed hub to substitute for three chainrings. Amazingly, on my commute, I've used most of the 21-gears. I have yet to spin out the big gear (111", about the same as 53x13) but I've come close. I really fly to work and manage NYC traffic all in one bike. I highly recommend it.