Explore every inch on and off the beaten path on the Schwinn Men's High Plains 27.5 in 21-Speed Mountain Bike. It's designed with a durable aluminum mountain frame for controlled riding, and the 27.5-inch x 2.2-inch all-terrain tires have go-anywhere traction for a variety of surface types. The 21-speed rear derailleur helps you shift gears as soon as necessary, and the front suspension fork offers a smooth ride, even over bumpy surfaces.