What is the advantage of notched (cog) V-belts compared to classic V-belts?

Notched (cog) V-belts are designed with notches along the belt's inner surface, which allows them to flex and conform more easily to small diameter pulleys. This flexibility is crucial for applications where space is limited or where the pulleys are smaller in size.

The design of cog belts allows for greater adaptability when wrapping around smaller pulley diameters as they can bend more easily compared to classic V-belts. This capability enhances their efficiency and effectiveness in achieving the necessary grip while reducing slippage and wear.

In contrast, while other advantages might be associated with different types of belts, such as longer lifespan or tension requirements, the primary benefit of notched V-belts lies in their ability to operate efficiently over smaller pulleys, making them suitable for a broader range of applications where size constraints are a factor.