The micro-slip developed in contact area points is involved in rolling friction. It occurs in some points whilst in others the surfaces move together. Contact area is divided into micro-slip zones, subjected to opposite shear stresses. These are computed in each point and their values yield the power lost by interface friction and related micro-slip torque. Theoretical results are checked by comparison with published data. The specific power loss, defined as the power lost by friction on a unity of contact area, does not depend on direction of shear and its integral over contact area yields the lost power due to micro-slip. The micro-slip component of rolling friction coefficient is calculated by dividing power losses by the product between normal load and relative angular velocity. Global rolling friction coefficient includes as well hysteresis losses. Experimental evidences confirm well the advanced model.

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