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SHOZ123 said:24.75 mm, there should be a number stamped on the rotor if it is an OEM one.
Front Disc Brake Rotor Nominal Thickness 26 mm (1.02 inches)
Front Disc Brake Rotor Minimum Thickness a 24.75 mm (0.974 inch)
Front Disc Brake Rotor Diameter 294 mm (11.6 inch) (SHO)
Front Disc Brake Rotor Allowable Runout On Vehicle 0.08 mm max. (0.003 inch)
Hub Face Maximum Runout 0.04 mm (0.0016 inch)
Front Disc Brake Rotor Finish 0.40-3.2 micro-meters (15-125 micro-inches)
Front Disc Brake Rotor Thickness Variation 0.009 mm (0.0004 inch) (SHO)
a Minimum safe thickness is cast on each front disc brake rotor.