We have calculated the fermion contributions to the shift of the
position of the poles of the massive gauge boson propagators at
two–loop order in the Standard Model. Together with the bosonic
contributions calculated previously the full two–loop corrections are
available. This allows us to investigate the full correction in the
relationship between MS and pole masses of the vector
bosons $Z$ and $W$. Two–loop renormalization and the corresponding
renormalization group equations are discussed. Analytical results for
the two-loop propagator type diagrams are presented. A new approach of
summing multiple binomial sums has been used.
