def calculate_r_dynamic(r_wheels, tyre_dynamic_rolling_coefficient):
    """
    Calculates the dynamic radius of the wheels [m].

    :param r_wheels:
        Radius of the wheels [m].
    :type r_wheels: float

    :param tyre_dynamic_rolling_coefficient:
        Dynamic rolling coefficient [-].
    :type tyre_dynamic_rolling_coefficient: float

    :return:
        Dynamic radius of the wheels [m].
    :rtype: float
    """
    return tyre_dynamic_rolling_coefficient * r_wheels
