Chain guide assembly frame

A chain guide assembly frame comprising a main body and a sprocket holding portion that is able to support a driven sprocket,

• the main body including a pivoting chain guide holding portion that is able to mount a pivoting chain guide, and a fixed chain guide,
• the sprocket holding portion including a fixed-guide-side sprocket holding portion provided on a same side as the fixed chain guide, and a pivoting-guide-side sprocket holding portion provided on a same side as the pivoting chain guide holding portion,
• the fixed-guide-side sprocket holding portion including at least a first fixed-guide-side support portion that supports the driven sprocket disposed in the fixed-guide-side sprocket holding portion from below at a first contact point, and a second fixed-guide-side support portion that supports the driven sprocket at a second contact point located more outside than the first contact point,
• a force of gravity acting on the driven sprocket having a vector that points between the first contact point and the second contact point when the driven sprocket is in an erected state in which the driven sprocket is supported simultaneously by the first fixed-guide-side support portion and the second fixed-guide-side support portion,
• the first fixed-guide-side support portion has a shape such that the closer to the second fixed-guide-side support portion, the more away from a center of gravity of the driven sprocket supported by the first fixed-guide-side support portion and the second fixed-guide-side support portion.