Fat tyre bikes (FTB) are different from other bikes in a few ways. Firstly, they have wider and thicker tyres, which provide better traction and stability on uneven or loose terrain. Secondly, they often have a more durable and sturdy frame, which can handle the added stress of off-road riding. Finally, they often have a unique and rugged aesthetic, making them a popular choice for adventure-seekers and outdoor enthusiasts.