fixed-gear

[ fikst-geer ]
/ ˈfɪkstˈgɪər /

noun

Also called fixed-gear bicycle; Informal, fixie. a bicycle having a single-gear system and lacking a freewheel mechanism, so that the wheels only move when the pedals move.
such a gear system: The bike has a fixed gear.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019