track bicycle; fixed-gear bicycle; fixie
A bicycle with a fixed gear, originally designed for track racing but also popular for street riding. The term covers both serious track bikes and casual fixies.
from French piste · from English bike
He uses a fixed-gear bike for his commute.
Track bikes often don't have brakes.
Variant spelling with a middle dot; less common but seen in some contexts.
From French 'piste' (track) and English 'bike', referring to a bicycle designed for track racing.