Nirve Ultraliner Men's 3-Speed Automatic Shifting Hybrid Cruiser Bike Bike Type: Hybrid--A cross between a mountain bike and cruiser. This provides you with a comfortable ride, even on gravel paths. Bike Frame Material: Aluminum--A light material that offers you a responsive ride. Type of Shifter: Shimano Automatic--Shift speeds automatically, just like a car Front Brake: Hand brake-- Rear Brake: Hand Brake--A simple designed hand-operated brake that will give you extreme braking power.