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Reference.org
Bicycle chain
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<p>A bicycle chain is a <a href="/facts/Roller_chain/YEb9SMmN">roller chain</a> that transfers <a href="/facts/Power_(physics)/mkaEyRnn">power</a> from the <a href="/facts/Bicycle_pedal/RKCtvxAu">pedals</a> to the <a href="/facts/Drive_wheel/yMr3ldGK">drive</a>-<a href="/facts/Bicycle_wheel/0Lf9C53L">wheel</a> of a <a href="/facts/Bicycle/nxBVrlBF">bicycle</a>, thus propelling it. Most bicycle chains are made from <a href="/facts/Carbon_steel/QGYURvFA">plain carbon</a> or <a href="/facts/Alloy_steel/DR2tGHEH">alloy steel</a>, but some are <a href="/facts/Nickel_electroplating/Ray99l2m">nickel-plated</a> to prevent rust, or simply for aesthetics. </p>