  We propose a quantum gravity-extended form of the classical length
contraction law obtained in Special Relativity. More specifically, the
framework of our discussion is the UV self-complete theory of quantum gravity.
Against this background, we show how our results are consistent with, i) the
generalised form of the Uncertainty Principle (GUP), ii) the so called
hoop-conjecture which we interpret, presently, as the saturation of a Lorentz
boost by the formation of a black hole in a two-body scattering, and iii) the
intriguing notion of "classicalization" of trans-Planckian physics. Pushing
these ideas to their logical conclusion, we argue that there is a physical
limit to the Lorentz contraction rule in the form of some minimal universal
length determined by quantum gravity, say the Planck Length, or any of its
current embodiments such as the string length, or the TeV quantum gravity
length scale. In the latter case, we determine the \emph{critical boost} that
separates the ordinary "particle phase," characterized by the Compton
wavelength, from the "black hole phase", characterized by the effective
Schwarzschild radius of the colliding system. Finally, with the
"classicalization" of quantum gravity in mind, we comment on the remarkable
identity, to our knowledge never noticed before, between three seemingly
independent universal quantities, namely, a) the "string tension", b) the
"linear energy density," or \emph{tension} that exists at the core of all
Schwarzschild black holes, and c) the "superforce" i.e., the Planckian limit of
the static electro-gravitational force and, presumably, the unification point
of all fundamental forces.
