Illustration of an epicyclic gear effecting a gear reduction/increase.
<a href="https://en.wikipedia.org/wiki/en:User:Wapcaplet" class="extiw" title="w:en:User:Wapcaplet">Wapcaplet</a>
CC BY-SA 3.0
<ul><li>Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons. (originally uploaded at <a href="https://en.wikipedia.org/wiki/en:Image:Epicyclic_gear_ratios.png" class="extiw" title="w:en:Image:Epicyclic gear ratios.png">w:en:Image:Epicyclic gear ratios.png</a>.)</li>
<li><span class="int-own-work" lang="en">Own work</span>. Created in <a href="https://en.wikipedia.org/wiki/en:Blender_(program)" class="extiw" title="w:en:Blender (program)">Blender</a> and composited in the <a href="https://en.wikipedia.org/wiki/en:GIMP" class="extiw" title="w:en:GIMP">w:en:GIMP</a>.</li></ul>