Noun
chainring (plural chainrings)
The large forward ring on a bicycle that a chain attaches to, in order to transfer energy to a wheel. It consists of one or more sprockets that are driven by the cranks and pedals of the bicycle.
Coordinate terms: pinion, spider
Holonym: crankset
A bicycle with shaft drive instead of a chain With a chain drive transmission, a chainring attached to a crank drives the chain, which in turn rotates the rear wheel via the rear sprocket(s) ( cassette or freewheel ). Source: Internet
A dérailleur system normally has two dérailleurs, or mechs, one at the front to select the chainring and another at the back to select the sprocket. Source: Internet
Otherwise, the relatively lighter and less expensive double chainring may be better. Source: Internet