Last but not least, as the chainring spins it causes the rear gear to rotate via the chain.Īs the rear gear turns so does the rear wheel and you’re off and riding! Without a chain connecting the two gears, your pedals would spin freely and the bike wouldn’t move. Because the cranks are connected to the chainring, they cause the chainring to spin. Now that you understand the gears on the bike, let’s cover how they actually work together!Īs your feet push on the pedals, this causes the crank arms to rotate. Thus, a bike with two front chainrings and 10 cogs in its rear cassette would have a total of 20 gears. The number of gears on your bike is as simple as multiplying the number of front chainrings by the number of cogs in the rear cassette. Each intermediate cog will have an increasing number of teeth that falls inside this range. Whereas the larger number refers to the number of teeth on the largest cog in the grouping. The smaller first number refers to how many teeth are on the smallest cog in the cassette. Something like “11-42T” or “10-50T” are examples of what these ranges could look like. When looking at the specs for a cassette, you’ll notice that it will have a range listed. This rear grouping of gears forms the cassette. In the rear, you will probably have anywhere from seven to twelve gears (also known as cogs). Common sizes include but are not limited to 30T or 42T. These chainrings will have sizes that are referred to by their number of teeth. Older bikes will probably have three chainrings up front, while more modern bikes often have one to two. On the front, you’ll have anywhere from one to three large chainrings. Let’s start with what your bike has on it. This way you’ll be able to make informed decisions when upgrading cassettes or buying new bikes in the future. I’ll be covering it all! How Mountain Bike Gears Workīefore going any further, it makes a lot of sense to get a really good understanding of how the gears on your mountain bike actually work. Rather than provide one-off answers, I have created a complete beginner’s guide on mountain bike gears.įrom how they work, how to use them, and the available options. While the gears on a mountain bike seem pretty simple, there’s actually a lot of engineering behind them to maximize efficiency.
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