Columbia Everest Men&rsquo;s Dual Suspension 21-Speed Mountain Bike Premier 27.5-inch Dual Suspension Mountain Bike featuring a light weight alloy frame for long-lasting durability Front and Rear suspension delivers a smooth ride in all conditions Aggressive off road Kenda 27.5"x 1.95" tires and front disk brakes 21 speed Shimano shifters and derailleurs provide seamless gear transition and allows for aggressive trail riding 20-inch frame size fits most riders between 5'9'' and 6'2''