The GMC Denali 21-Speed Road Bike is built around a lightweight aluminum road bike frame. You'll stop on a dime with the strong alloy calipers and ultra-responsive brake levers. And, superior performance is guaranteed by the high-profile and attractive alloy Vitesse racing rims. Shimano Revo shifters allow you to shift without taking your hands off the handlebars for the ultimate in safety and security. A Shimano derailleur completes the drive train for quick and smooth gear changes. Lastly, this road bike will help keep you comfortable with the black, Cionlli saddle. With 700c tires and a coat of hot yellow and black paint, the attractive Denali Road Bike is up to the challenge of rigorous street racing.