Rear Disc Rotor Material & Dimensional Standards

Description

Rear disc rotors are primarily engineered from High-Carbon Grey Cast Iron (specifically Grade G3000 or G3500) due to its superior thermal conductivity, vibration damping, and wear resistance. These components are manufactured according to strict international standards such as SAE J431 and ISO 26867, which dictate the chemical composition and mechanical strength required for safe braking. Dimensionally, rear rotors are often designed as “solid” discs—unlike the thicker, vented front rotors—since they handle less braking load. To ensure smooth operation, critical tolerances such as Lateral Run-out (typically kept under 0.05mm) and Disc Thickness Variation (DTV) (under 0.01mm) are strictly enforced to prevent pedal pulsation and ensure consistent friction across the surface.