Diamondback Bicycles Overdrive Hardtail Mountain Bike with 27.5" Wheels Hand built 6061-T6 aluminum alloy hardtail frame is Classic mountain biking Custom formed and butted tubing combines lightweight and stiffness 27.5 inch wheels roll well over obstacles and offer Quick handling weight-32.9lbs +/- .SR Sun tour XCT fork delivers 80mm of suspension travel 3 gears in the front and 8 gear in the back give you a combined 24 speeds to choose from