Cover of wheel hub, ALUMINUM (MZA) - Simson DIMENSIONS: outer diameter: 128 mm hole diameter (on the axis): 12 mm axle bore height: 11 mm Can be used for: Simson S50, S51, S53, S70, S83, SR50, SR80, Schwalbe KR51, Schwalbe KR51/2, Star SR4-2, Sperber SR4-3, Habicht SR4-4, Duo 4/1 The product of the MZA, which is the exclusive holder of the SIMSON brand.