From wikipedia: A fatbike is a bicycle with over-sized tires, typically 3.7" or larger and rims wider than 44mm, that are designed for riding on soft unstable terrain such as snow and sand. These bikes are built around frames with large forks and stays to accommodate the wide rims required to fit ...

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What's the difference between All-Mountain, Cross Country, Freeride, Downhill bikes?

I'm somewhat new to the world of mountain bikes and I'm seeing various terms to describe different bikes. What is the difference between all-mountain, cross country, freeride, and downhill? Are they ...