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Chainrings come in several forms for all kinds of bikes. Some folks call them chainwheels, crankwheels, or front sprockets. Others call them stars, plates, or rings.
In French, plateaux;
in Spanish, platos;
in Italian, ingranaggi;
in German, Kettenrader;
in Dutch, kettingbladen.
They must fit solid with the crank axle, unyielding under the force that pedals the bike: you. They also must be as round as humanly possible, close to a perfect circle: Pi (3.14...).
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