Allen Sports Atocha Aluminum 24" Wheeled Folding Bike with Disc Brakes & 18 Speeds, Red 6061 Aluminum Frame and a shamano rear derailleur deliver a great all around folding bicycle for every day use 18 Speeds (2 x 9) provides wide gear range for easy hill climbs or fast treks on flat ground 24" wheels deliver exceptional ride performance, and low maintenance disc brakes offer excellent stopping power Patented frame release levers allow quick and easy folding of bicycle in less than 8 seconds Patented wheel lock system secures the bicycle when folded and allows the bicycle to be rolled like a cart