Retrospec Bicycles AMOK Convertible Single-Speed CycloCross/Commuter Bike with Chromoly Frame The 4130 Chromoly frame is hand-built, double butted, tig-welded, heat treated and ready to add a derailleur and cable stops if you want to add gears Rear hub fits a cassette, frame is ready for a derailleur, cable stops, down tube shifters, fenders, rack, any handle-bars and all types of terrain Sealed bearing hubs for less rolling resistance than loose ball hubs, less maintenance when you ride in dirt or rain Sealed Bottom Bracket, Alloy Crank with 42T chainring 700C Double Wall Rims, Kenda Cyclo Cross Tires, Integrated Seat Clamp, among other high performance specs