A sliding wall system, comprising: • at least one ceiling guide , and • at least one door leaf element , which is attached to at least one roller carriage of the sliding wall system and is displaceably disposed in the ceiling guide , • wherein the at least one roller carriage includes a basic body , at which at least one running roller and/or at least one guiding roller is disposed, wherein the running roller and/or the guiding roller include/s a roller body , and • wherein the roller carriage is displaceably disposed in the ceiling guide by means of the roller body rolling on at least one running surface of the ceiling guide , • wherein the roller body has a modulus of elasticity of 2 kN/mm 2 to 4 kN/mm 2 at 20 °C, a modulus of shear of 0.5 kN/mm 2 to 1 kN/mm 2 at 20 °C, and a density of 1 g/cm 3 to 2 g/cm 3 at 20 °C, and • the running surface has a modulus of elasticity of 60 kN/mm 2 to 80 kN/mm 2 at 20 °C, a modulus of shear of 10 kN/mm 2 to 40 kN/mm 2 at 20 °C, and a density of 2 g/cm 3 to 5 g/cm 3 at 20 °C, characterized in that the basic body has a modulus of elasticity of 70 kN/mm 2 to 100 kN/mm 2 at 20 °C, a modulus of shear of 20 kN/mm 2 to 60 kN/mm 2 at 20 °C, and a density of 2 g/cm 3 to 7 g/cm 3 at 20 °C, • wherein the running surface includes at least partially a grooving essentially parallel to a direction of displacement (V) of the door leaf element , • wherein the grooving of the running surface has a surface roughness Ra of 0.05 μm to 1.0 μm, preferably of approximately 0.5 μm, and • the roller surface of the roller body has a surface roughness Ra of 0.01 μm to 3 μm, preferably of 0.05 μm to 2 μm, and • the static contact stress between the running roller and the running surface of the ceiling guide amounts at least to 2.5 kg/mm 2 , preferably to between 2.5 kg/mm 2 to 100 kg/mm 2 , wherein the roller body is supported at the roller carriage by means of a closed ball bearing . • at least one ceiling guide , and • at least one door leaf element , which is attached to at least one roller carriage of the sliding wall system and is displaceably disposed in the ceiling guide , • wherein the at least one roller carriage includes a basic body , at which at least one running roller and/or at least one guiding roller is disposed, wherein the running roller and/or the guiding roller include/s a roller body , and • wherein the roller carriage is displaceably disposed in the ceiling guide by means of the roller body rolling on at least one running surface of the ceiling guide , • wherein the roller body has a modulus of elasticity of 2 kN/mm 2 to 4 kN/mm 2 at 20 °C, a modulus of shear of 0.5 kN/mm 2 to 1 kN/mm 2 at 20 °C, and a density of 1 g/cm 3 to 2 g/cm 3 at 20 °C, and • the running surface has a modulus of elasticity of 60 kN/mm 2 to 80 kN/mm 2 at 20 °C, a modulus of shear of 10 kN/mm 2 to 40 kN/mm 2 at 20 °C, and a density of 2 g/cm 3 to 5 g/cm 3 at 20 °C, characterized in that the basic body has a modulus of elasticity of 70 kN/mm 2 to 100 kN/mm 2 at 20 °C, a modulus of shear of 20 kN/mm 2 to 60 kN/mm 2 at 20 °C, and a density of 2 g/cm 3 to 7 g/cm 3 at 20 °C, • wherein the running surface includes at least partially a grooving essentially parallel to a direction of displacement (V) of the door leaf element , • wherein the grooving of the running surface has a surface roughness Ra of 0.05 μm to 1.0 μm, preferably of approximately 0.5 μm, and • the roller surface of the roller body has a surface roughness Ra of 0.01 μm to 3 μm, preferably of 0.05 μm to 2 μm, and • the static contact stress between the running roller and the running surface of the ceiling guide amounts at least to 2.5 kg/mm 2 , preferably to between 2.5 kg/mm 2 to 100 kg/mm 2 , wherein the roller body is supported at the roller carriage by means of a closed ball bearing . <EOS>