GMC Denali Girls' 24-Inch Road Bike Sturdy 24-inch girl's road bike with lightweight aluminum frame Triple-chaining alloy crank set with Shimano TZ40 derailleurs Shimano Revo 21-speed twist shifters for precise on-the-move shifting Lightweight V-profile wheels and Kenda 24-inch tires with matching trim Ideal for smaller riders; lifetime warranty on the frame and fork