  Within a minimal extension of the SM in 4+1 dimensions, we study how Kaluza
Klein excitations of the SM gauge bosons affect the electroweak precision
observables. Asymmetries in Z decays provide the dominant bound on the
compactification scale M of the extra dimension. If the higgs is so light that
will be discovered at LEP2, we find the following 95% CL bounds: M > 3.5 TeV
(if the higgs lives in the extra dimension) and M > 4.3 TeV (if the higgs is
confined to our 4 dimensions). In the second case Kaluza Klein modes give
"universal"corrections and a good fit of precision data can be obtained with an
heavier higgs (up to 500 GeV) and with a smaller M > 3.4 TeV.
