FIELD: sports equipment or vehicles. SUBSTANCE: sportive apparatus or vehicle has skid with base and replaceable running blade secured on base. Flat continuous stabilizing tire standing on the edge is cast or glued into lower side of base. Running blade adheres flush with base and tire. Transverse openings extending through tire and blade are adapted for receiving fastening device. EFFECT: increased efficiency, provision for precise attachment of replaceable running blade, high torsional rigidity and flexural strength, low weight and low manufacture cost. 28 cl, 20 dwg
