This is a great bike at an amazing price. The bike comes ready to ride as a single speed, you can flip the rear wheel for fixed gear. It has a flip-flop hub which allows for Freewheel or Fixed Gear configuration.Full Specs:Frame: Chro-mo SteelFork: 700C Steel 1 1/8" ThreadlessCrankset: Tec9 Forged Alloy w/ 46T ChainringCassette: 16T Freewheel & 16T FixedHubs: Flip FlopRims: 700c Double walled w/ CNC machined sidesTires: 700c x 25cBrakes: Promax Front & RearHandlebar: AlloySaddle: VaderSeatpost: Tec9 AlloyStem: Tec9 AlloyPedals: Included