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A chainless bicycle is a bicycle that transmits power to the driven wheel through a mechanism other than a metal chain.

Examples

Directly driven "ordinary" bicycle (see Penny-farthing)
Shaft-driven bicycle
Belt-driven bicycle
Hydraulic bicycle (and pneumatic bicycle)
Hybrid vehicle (see Series hybrid bicycle)
Some rowed bikes use a cable or a linkage.
Stringbike the pulley-driven Hungarian designed bike