Diamondback Bicycles 2015 Atroz Full Suspension Complete Mountain Bike Hand built 4-inch travel 6061 t-6 aluminum alloy full suspension frame is super strong Sram 9-speed drivetrain gives you a great range of gears for any terrain Rockshox monarch r rear shock and SR sun tour XCM fork absorb jolts from the trail Tektro Aries disc brakes deliver ample stopping power 27.5" Wheels roll well over obstacles and offer quick handling