The beauty of the Hyper Bicycles 700c Ladies Spin Fit Hybrid Bike for Adults, Teal and White is that it marries mountain bike and road bike styles, so you can enjoy both in one. Its aluminum frame joins with a Shimano drive train and features a 21-speed shifter set and rear derailleur. It also comes equipped with low-profile, high-performance tires to ensure a safe and fun ride. The aluminum hybrid bike has front and rear caliper brakes for reliable stopping power.