Abstract: An in-line skate frame assembly has a rigid frame and an elongate grinding insert releasably engaged with the frame. The frame and insert are secured together to the sole of a shoe or boot by frame bolts extending through upper portions of the frame and insert. The frame has spaced side walls with downwardly facing recessed regions in which the insert is mounted. The insert extends along a major portion of the length of the frame and has a downwardly facing, centrally located grinding surface which terminates short of the opposite ends of the insert. Different inserts with grinding surfaces of different shapes and lengths are releasably secured to the frame for performing alternative grinding maneuvers.

Abstract: A skate assembly has a boot having a substantially completely open base with a sole plate of more rigid material than the boot secured over the open base. The base has an opening extending along at least substantially the entire length of the boot from the heel to the toe, with side rims extending along opposite sides of the base opening. The sole plate may be releasably or permanently secured to the boot.

Abstract: An in-line skate apparatus has a frame for attachment to the sole of a shoe with a pair of outer, substantially flat side faces, a front end, a rear end, and a lower edge. A plurality of wheels are rotatably mounted on the frame in a line from the front end to the rear end of the frame, and a cut out extends upwardly from the lower edge between an adjacent pair of wheels. A separate H-block is releasably mounted in the cut-out so as to substantially fill the cut-out, and has a width at least equal to the width of the frame, so that its outer side faces are substantially flush with the outer side faces of the frame. The H-block has an arcuate, downwardly directed sliding region extending across its width and along at least part of the height of each side face, whereby the sliding region of the H-block includes the only sliding surface of the apparatus during sliding maneuvers.

Abstract: An in-line roller skate has a replaceable slider at the especially exposed areas of the shoe to protect the shoe from wear. The slider is very inexpensive and can be replaced after it has been worn out, and its replacement can even be carried out by nonprofessionals. The slider is preferably shaped in such a way that the shoe in the sliding area is covered completely by the slider, so that it no longer comes into contact with the ground or railings.