You may see a odd looking mountain bike with really big fat wheel in the streets of Kathmandu in last couple of years. Those bike are known as fat bikes. So let's talk about that. According to Wikipedia "A fatbike (also called fat bike or fat-tire bike) is an off-road bicycle with oversized tires, typically 3.8 in (97 mm) or larger and rims 2.6 in (66 mm) or wider, designed for low ground pressure to allow riding on soft unstable terrain, such as snow, sand, bogs and mud." Personally I haven't rode a fat bike on the trails (if anyone wants to give me a bike for a test ride you can always contact me) but I have taken it for a short test ride. I was a really different experience. Those huge wheels were really difficult to more forward from the neutral position. But once it started to roll it down it was much easier than it was imagined. We would roll really low on PSI because of the huge tire. I will post the full review once I get more time to spent on it.