XLC Brake Disc BR-X59 Material: Brake surface: Stainless steel AISI 420 Spider: Aluminium 7075 Two-piece construction for reduced disc deformation at high temperatures Reduced heat transfer to hub protects bearings Weight: ø 160 mM125g with CNC friction ring Improved braking performance in wet conditions Reduces frictional heat in dry conditions Reduces braking time for brake pads