Biking is a great way to get outdoors, whether on a cycling road trip or biking in the mountains. Learn more about cycling in the Biking Channel.
How Mountain Bikes Work
If you've been on a biking trail in the last few years, you've probably seen all kinds of crazy-looking bikes. Mountain bikes just keep accumulating more gears. Today, some bikes have as many as 27 gear ratios. What do they all do?