Published July 31, 2015 12:00AM

A dropper post in its natural habitat. (Photo: Eric Leslie/<a href="https://www.flickr.com/photos/ericleslie/"target="_blank">Flickr</a>)
A mountain-bike component that can be raised or lowered with a button mounted on the handlebars. The hydraulic system allows rider to quickly switch between low positions (for technical descents) and high (for climbing).