Retrospec Bicycles Fixed-Gear Single-Speed Bike with Sealed Bearing Hubs Smooth welded 6061 aluminum frame, oval aerodynamic tubing, double-plated dropouts Tight race-inspired geometry with a thicker down tube and pista race Drop bars for more aerodynamic riding Integrated headset and sealed bearing hubs ensure a smoother ride and extend the life of your bicycle Flip-flop hub so you can choose to ride fixed-gear or single-speed with a freewheel Equipped with front brakes to keep you safe while riding