Diamondback Tess 24 Jr Girls' Mountain Bike (24-Inch Wheels) 24-inch girl's mountain bike with heat-treated aluminum frame Front suspension fork with 40mm of travel; 21-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