Diamondback Bicycles 2015 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 Custom formed and butted tubing for strength and light weight Sr sun tour 120mm travel fork handles suspension duties Sram 1x9-speed drivetrain with chain guide delivers simple, hassle-free performance 27.5" DB sl-7 double wall wheels are strong and nimble