The GMC Denali 700C 21-Speed Road Bike is built around a lightweight aluminum road bike frame. You'll stop on a dime with the alloy calipers and brake levers and the high-profile alloy Vitesse racing rims look as good as they perform. Shimano Revo shifters allow you to shift with out taking your hands off the handle bars providing safety and confidence. A Shimano derailleur completes the drive train for quick and smooth gear changes. Lastly, this road bike will help you stay hydrated with the included alloy water bottle cage.