Karen, an REI Outdoor School instructor, demonstrates how to properly shift your road bike in this video. The way the road bikes are set up there are two different chainrings. These are like the transmission that drive your bike. <br /><br /><br />http://www.rei.com/bikeyourdrive<br /><br /><br /><img src="http://ll.broadbandsports.com/images/25610_thumb.jpg" alt="How to Safely Shift Your Road Bike Video" title="How to Safely Shift Your Road Bike Video" width="150" height="90" alt="How to Safely Shift Your Road Bike Video"/>
