Diamondback Bicycles Line Hard Tail Complete Mountain Bike Reliable hand built 6061-T6 aluminum alloy hard tail frame w/ progressive, low slung geometry for trail riding performance SR Suntour 120mm travel fork handles suspension duties SRAM 1x9-speed drivetrain with chain guide delivers simple, hassle-free performance Tektro Auriga Hydraulic Disc Brakes w/ 180/160mm Rotors 27.5" DB SL-7 Double wall wheels are strong and nimble