Suppose you have a wheel of mass $m$ rolling down an incline. Then the component of the weight along the incline acts on the centre of mass of the wheel, causing it to accelerate. The (static) friction force points up the incline. This friction force acts on the point of the wheel that is in contact with the incline and therefore a torque causes an angular acceleration, i.e. the wheel rotates while rolling down.
I have read that this friction force acts on the centre of mass of the wheel, too, causing the centre of mass of the wheel to accelerate more slowly than a block on a frictionless incline.
I don't understand how the friction force is transmitted from the bottom of the wheel to the centre of mass. I can only see that it acts as a torque on the bottom of the wheel, thus causing rotation. (I mean, a force cannot act on two different points at the same time, right?)