Retrospec Bicycles AMOK V2 CycloCross Convertible Single-Speed/Commuter Bike with Chromoly Frame Hand-built, tig-welded, and double-butted 4130 Chromoly frame Forged rear drop with derailleur hanger Sealed bearing hubs for less rolling resistance and maintenance Sealed Bottom Bracket, Alloy Crank with 42T chain ring 700C Double Wall Rims, Kenda Small Block 8 tires, and 3/32" Chain