  We study the process e^+e^- --> W^+W^- to probe low-scale gravity at high
energy linear colliders. A characteristic signature of extra-dimensions models
is the forward-backward asymmetry due to the interference of spin-2 graviton
and spin-1 SM gauge boson exchange terms, even when right-polarised electron
beam is used. Our analysis shows that larger than 5% asymmetry is possible at a
linear collider with \sqrt{s}=500 (800) GeV if the mass scale, M_S is smaller
than 2.7 (4.5) TeV. W^- polarisation factors measured with a few percent
accuracy will also be able to put similar limits on M_S.
