Bicycle chainline explained

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<blockquote class="wp-embedded-content" data-secret="E7kdJDpmY5"><a href="https://bike.bikegremlin.com/1755/bicycle-chainline/">Bicycle chainline</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://bike.bikegremlin.com/1755/bicycle-chainline/embed/#?secret=E7kdJDpmY5" width="600" height="400" title="&#8220;Bicycle chainline&#8221; &#8212; BikeGremlin" data-secret="E7kdJDpmY5" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script>
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