Diamondback Girls' Tess 20 Jr Mountain Bike (20-Inch Wheels) 20-inch girls' mountain bike with heat-treated aluminum frame Front suspension fork with 40mm of travel; 6-speed drivetrain Shimano Revo twist shifters; steel junior riser handlebar Linear pull brakes with comfortable hand-brake levers Alloy wheels and wide knobby tires; resin platform pedals