fixie
n.— «The “fixie” (n): A fixed-gear, single-speed bike without a freewheel, used for racing at bike tracks known as velodromes.» —“Fixed-sated: Coasting is for poseurs. Fixed-gear bikes are about the pedaling” by Florangela Davila Seattle Times (Wash.) Mar. 30, 2006. (source: Double-Tongued Dictionary)