Abstract: A skate particularly adapted for speed contests has a foot-receiving boot hinged about a fore-foot section of the sole to a in-line wheel-mounting or blade-mounting truck so that the heel-section of the boot can be rotatively lifted away from the truck while keeping the skate is full contact with the skating surface. The boot is biased down toward the truck by a strong spring in a first embodiment of the invention, or by the resiliency of a hinge-forming web linking the boot to the truck in an alternate embodiment. A quickly set mechanism is provided to lock the boot onto the truck to turn the device into a conventional skate.