What is faster 125cc pitbike or 85cc crosser?

In general, a 125cc pit bike is faster than an 85cc motocross bike. Pit bikes are designed for flat track racing and are typically lighter than motocross bikes, with a higher power-to-weight ratio. This gives them an advantage in terms of speed, especially on short, straight tracks. Pit bikes also have larger wheels, which provide better traction and allow for higher speeds.

However, motocross bikes are designed for off-road use and have a number of features that make them better suited for this type of terrain. These features include a longer suspension travel, which allows them to absorb bumps and jumps more effectively, and a more aggressive tread pattern on the tires, which provides better traction in loose dirt and mud.

Ultimately, the best bike for you depends on your intended use. If you are looking for a fast bike for flat track racing, a 125cc pit bike is a great option. If you are looking for a bike for off-road use, an 85cc motocross bike is a better choice.