There are various types of off-road motorcycles, also known as dirt bikes, specially designed for off-road events. The term off-road refers to a driving surface that is not conventionally paved. This is a rough surface, often created naturally, such as sand, gravel, a river, mud or snow. This type of terrain can sometimes only be travelled on with vehicles designed for off-road driving (such as SUVs, ATVs, snowmobiles or mountain bikes) or vehicles that have off-road equipment. Compared to road-going motorcycles, off-road machines are simpler and lighter, having long suspension travel, high ground clearance, and rugged construction with little bodywork and no fairings for less damage in spills. Wheels (usually 21" front, 18" rear) have knobby tires, often clamped to the rim with a rim lock.

Source: Types of motorcycles from Wikipedia

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