How Bike Gears Work
The gears in mountain bikes just keep getting more and more intricate. The bikes nowadays have as many as 27 gear ratios. A mountain bike will use a variety of three different sized sprockets in the front and nine in the back to produce gear ratios.
The concept behind every one of these gears is always to allow the rider to crank the pedals at a constant pace no matter what kind of slope the bike is on. You can understand this better by picturing a motorcycle with just
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