Belt-driven bicycle

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A belt-driven bicycle is a bicycle that uses a rubber and fiber belt (such as typically drives automotive accessories) to transfer power from the pedals to the wheel.

Benefits:

Lubrication is not required.
Smoother operation
Longer life than chains

Disadvantages:

Possibly more difficult to get (though often readily-available automotive standard belts are used).
Belt-driven bikes often incorporate proprietary plastic gears, which wear out more quickly than metal, in their drive trains.