A liter bike is a motorcycle with an engine displacement of approximately 1,000 cc, or one liter. The term "literbike" is often used to refer to high-performance motorcycles, particularly sport bikes. While there is no strict definition for a literbike, some generally accepted conventions apply when talking about one. For example, literbike can always apply to a modern 1,000 cc sport bike, and if a motorcycle is within 100 cc of 1,000, its safe to call it a literbike. However, everyones definition is a little different, and there is some debate about what constitutes a literbike.

Literbikes are known for their high horsepower and acceleration, and they are often used for racing. They are not for everyone, as they can be uncomfortable and expensive to maintain. While literbikes are legal for street use, some argue that there is no reason to have a 1,000 cc sport bike for street use. Ultimately, whether or not to buy a literbike is a personal decision that depends on individual preferences and needs.