2.2.3.1 Difference Between Linear Tension and Wrapping

When the chain engages the sprocket, the chain collides with the sprocket tooth surfaces. The transmission capability is limited by the roller or bushing breakage during collision.

As it wraps on the sprocket and rotates, the chain receives centrifugal force. The faster the speed of rotation, the larger the centrifugal force becomes. Additionally, the pin and the bushing are also subject to tension. There is a limit to their bearing function.