  The discovery potential and diagnostic abilities of proposed future colliders
for new heavy neutral ($Z'$) and charged ($W'$) gauge bosons are summarized.
Typical bounds achievable on $M_{Z',W'}$ at the TEVATRON, DI-TEVATRON, LHC, 500
GeV NLC, and 1 TeV NLC are $\sim$1~TeV, $\sim$2~TeV, $\sim$4~TeV, 1--3~TeV, and
2--6~TeV, respectively. For $M_{Z'} \sim$1 TeV the LHC will have the capability
to determine the magnitude of normalized $Z'$ quark and lepton couplings to
around $10-20\%$, while the NLC would allow for determination of the couplings
(including their signs) with a factor of 2 larger error-bars, provided heavy
flavor tagging and longitudinal polarization of the electron beam is available.
